XTAs AudioCore PC Control Software on your Mac

AppleCore.?

Tied to the Mac OSX platform and need to control any XTA Electronics DP Series processor, or maybe you just need to update your DP Series or Series2 processor with the very latest firmware and algorithms?
Here's a very simple solution for Mac OSX computers and international support is FREE

Youll enjoy:

Far better Audio quality A better computer interface Great data management Fantastic real-time visual feedback

[V2.0 Nov 05]

MAC COMPUTERS RUNNING VIRTUAL PC 7 & OSX
For the control of XTA Software including: AudioCore 8.xx AudioCore 6 and previous versions. XTAs unit-upload software. XTAs SiDD PC.

Mac Software:

OSX: 10.3.9 Virtual PC version 7.0

PC software:

Microsoft XP Professional AudioCore 6 (and any previous versions) AudioCore 8 SiDD PC 2.11 XTAs Unit up-grade software

INTRODUCTION

Getting AudioCore 6 or 8 or SiDD PC and XTAs unit upgrade software running on your Mac isn't difficult in fact it's very, very easy

Mac Versus PC

Performance on a fast 1.5 GHz Mac in XP window emulation mode will always be slower: Emulating a PC on a Mac is never going to be ideal. The performance may vary depending on your Mac's: Processor speed RAM speed, or RAM size Mac Operating system (OSX, the preferred is Panther 10.3.9) Ultimately your USB to RSxxx interface
MY SET-UP These Tests Were Performed on: Computer Apple Powerbook laptop 17" Model PowerPC G4 Laptop Processor 1.33 GHz OS Panther 10.3.9 Memory 1.5 GB DDR SDRAM USB x2
Don't expect to run any XTA software in conjunction with SMART LIVE while processing any filters in Photoshop, and while surfing the Internet on a fast Mac laptop. If youre in the Studio and want to control a couple of DP324s (SiDDs) or have the luxury of having XTA Loudspeaker Management controlling your studio monitors then youre in luck. :-> Larger systems consisting of several DP428 or DP226s or even DP224s should work fine but its best to try it before you go on a major tour or do the all important and paying gig!
INSTALLING VIRTUAL PC 7.0
Follow the instructions to the word. You can customize what's installed too. I didn't install Outlook and explorer etc. Installing didn't require me to read the manual, I just dived straight in and it worked first time.

XP PROFESSIONAL

I recommend that you install the software supplied with Virtual PC V7 disc. I did and it worked fine (3 x discs in total). Installation is easy. If you're having problems consult the supplied manual first before contacting me.

USB to RS232 converter

It is highly recommended that you use the XTA approved USB - RS232 converter. XTA Part number: USB-232 Contact: tech@xta.co.uk

USB to RS485 Converter

It is highly recommended that you use the XTA approved USB - RS485 converter. XTA part number: USB-485 Contact: tech@xta.co.uk
AFTER INSTALLATION OF VIRTUAL PC AND XP
If youve added Virtual PC in the Mac dock (recommended), you should now proceed to install any Windows software. Download any XTA software and load as you would normally. Download and un-zip using your Mac software. Minimise the virtual PC window and drag the un-zipped XTA software you have downloaded onto the Windows XP desktop. Double click on the file within XP and let it install itself. Once any XTA software is loaded click the XP Start menu and select: AudioCore 8 or AudioCore 6 or SiDD PC or XTAs unit upload program Once XP has opened, this is when I plug my XTA approved USB to RS22/485 converter in. Wait for XP to find it. This may take 20 - 60 seconds. Once its found it will prompt you to locate the drivers. Insert the driver CD that comes with the converter. Installation is easy. If the USB interface isn't found?, go to Add hardware, (Start Settings Control Panel Add Hardware), and follow the instructions and browse for the CD ROM where they drivers reside or if you have copied them to the desktop browse to folder - select them it and OK it. If you choose to use a third party USB - RS232/485 converter?, It will be difficult for me to support it without buying one and trying it. This document is all about providing a simple solution and not about creating extra work for me and anyone at XTA Electronics. Please note: DO NOT INSTALL ANY MAC DRIVERS. The Mac OS will seize the USB port and deny it to Windows/XP.

AFTER DRIVER INSTALLATION
You should confirm that the drivers have been installed by checking in the device manager section within XP. (Start Settings Control Panel System hardware - Device Manger - Ports (COM & LPT). To view "devices by connection" (recommended) - select "view" from the top menu options and select "devices by connection. You can also select "devices by type". If "device by type" is selected search "Ports (COM & LPT)" for the attached "ATEN USB to Serial Bridge "(COMX). Your COM port may well be different to mine but it doesn't matter. See my screen captures Device_by_connection and View_by_device.

COMMUNICATION SET-UP

Three pages concern us when establishing communication. 1 - Virtual PC's PC Settings - PC - PC Settings 2 - XP device manager (Start Settings Control Panel System Hardware -Device Manger) 3 - XTAs Interface Sub-Menu page on any AudioCore capable device (DP428, DP226, DP224 etc) - Interface Sub-menu Enter)
1-PC Settings page Before opening AudioCore you will need to enable USB within XP. PC PC Settings After installing the USB drivers open up the "PC settings" page. You will notice there's a USB page. Enable USB and tick the box associated with your newly installed RS232 or RS485 converter. 2-XP's Device Manager (Start Settings Control Panel System Hardware - Device Manger) See my screen captures " View_by_Connection" and "Port_settings" Check on this page to confirm that the "ATEN Serial Bridge" (comX) is there. (Assuming you are using the XTA approved USB to RSxxx converter). Your third party USB-RSxxx converter should appear here. "View devices by connection" is the preferred view. My set-up installed the XTA USB-RS232 drivers as COMS 3. Don't worry if your set-up installs it as a different coms number. Double click on your coms USB - RSxxx converter in the view by connection page and check that the following settings are valid: Bits per second: Data bits: Parity: Stop bits: Flow control: 38400 (try slower if problems) 8 None 1 None

3 - XTAs Interface Sub-Menu. (Menu Next > - Interface Sub-menu Enter) The manual for your DPxxx processor will tell you how to navigate through this section. Select External interface - then enter - Adjust parameters to suit your set-up and enter to go to the next screen. The first DP Series unit, in the chain, will require you to select it as the Mode-Master. ID 1. Master source (RS232 or RS485) and baud rates are adjustable; Midi relay and Midi channel etc are also adjusted on this page. Make sure to Enter" to confirm any changes before testing.

START UP PROCEDURE

Start Virtual PC/XP This is where you select the program you wish to run. Select AudioCore 8 or 6 etc - then plug in your USB converter. If you are using a third party USB - RS232 or USB - RS485 converter it maybe different so just experiment to see what works for your system. Third party converters may require that you insert the USB device before you load AudioCore? There will be a delay while your USB- RS232 interface is found by XP. Wait for 20 seconds or so until the converter is found. If you try selecting "Start" etc from XP and nothing happens then the USB converter is still being found/optimized by XP so wait for a few more seconds. Once XP is happy, normal computer operations will resume and you can proceed.

AUDIOCORE REMOTE CONTROL

Open AudioCore and select "remote" via the top menu options to select your RS232 or RS485 set-up options i.e. if you have installed a XTA USB232 you should select RS232. Select the Baud rate that applies (Try 38400 to start with). Select Baud 9600 if you have any connection problems. Contact me directly if there are any problems with communication between the Mac and any DP Series or Series 2 processors. I've had this working from 4800 to 115200 baud without any problems.

XTA AUDIOCORE OPERATIONS

Performance will vary A fast Mac will slow down considerably when running OSX and Windows XP together. If you are in doubt while you have plugged a USB converter in or youre experiencing delays when opening AudioCore or plugging or unplugging a USB converter just wait for a bit. Normal Mac computer operations should resume once the converter is found and XP and then you to proceed. If you have a slower Mac than detailed in the document just wait a bit longer! Sorry but we are dealing with 2 operating systems here

AUDIOCORE

What can I say? It's the most powerful Audio control software available The attention to detail by xta is astounding. XTA's "state of the art" filter technology is second to none period! Contact XTA if you have any questions regarding their software. Dont ask about an AudioCore Mac software version because this will never happen

INTERNATIONAL SUPPORT

I've worked with Mac's and been involved Audio for years I'm happy to help out in any way possible but please be sensible with any emails you send. Thanks in advance. Cheers Martin Morris Email Post:

martin@spherical.co.nz

P. O. Box 6195 Marion Square, Wellington, New Zealand.

Contents

Safety Warnings....5 Unpacking the DP200.....5 Introduction....6 Front Panel Functions....8 Rear Panel Functions.....9 Operating The DP200....10 DP200 Configurations....12 Parametric Equaliser modes....12 Parametric Equalisation Block diagrams...13 Parametric Equalisation and Limit Modes...14 Crossover modes....16 Crossover Block diagrams....17 Gain, Delay and Phase Function Screen...19 High and Lowpass Filters Function Screen...20 Parametric Equalisation Function Screen...21 Limiter Control Function Screen....22 Limiter View Function Screen....23 Limiter Link Table....23 Memory Store.....24 Memory Recall....24 Security System....25 MIDI Operation....25 RS232, RS422 and RS485 Operation...26 Password Locking....26 AES/EBU Units....27 Equalisation Curves....29 Specifications....31 Operating Notes....32 Warranty.....33

Thanks

Thank you for choosing the XTA DP200 for your application. Please spare a little time to digest the contents of this manual, so that you obtain the best possible performance from this unit. All XTA products are carefully engineered for world class performance and reliability. If you would like further information about this or any other XTA product, please contact us. We look forward to helping you in the near future. XTA Electronics Ltd.

Safety Warnings

Please note the following information, which is provided for your safety:
Do not expose this unit to rain or moisture. Do not expose this unit to excessive heat. Replace all fuses with the correct type only. Do not remove the covers from this unit. There are no user serviceable parts inside - refer all servicing to qualified personnel.
The mains power cord is fitted with a safety earth (ground) connection. Do not operate this unit with this connection removed.

Unpacking the DP200

After unpacking the unit please check carefully for damage. If damage is found, please notify the carrier concerned at once. You, the consignee, must instigate any claim. Please retain all packaging in case of future re-shipment.

DP200 Page 5

Introduction
The DP200 is a compact and powerful DSP based audio processing unit, ideally suited for fixed installations, where it combines the functions of multiple conventional products in a compact 1U high unit. To achieve this the DP200 provides:- 2 input 4 output format, 10 configurations including 4 crossover modes, 4 x 8 bands of parametric equalisation, up to 682mS delay, variable High and Lowpass filters, 4 output limiters and digital level controls for each output. Each parametric section can be positioned between 20Hz & 20kHz, features a wide range of Q's and has +15dB to -30dB gain available, controllable in 0.1dB steps. The first two sections can also be designated a Low or High frequency shelving filter. MIDI control and user memories are provided, and also a multi-level security 'lock-out' function for all controls. The DP200 is also available with optional AES/EBU inputs and outputs. The DP200 is designed for quick adjustment via easy-to-use front panel controls, or it can be controlled externally by XTA's AudioCore Windows control software, along with both existing and future AudioCore series products. Features
Superb audio quality : Carefully optimised Double Precision processing plus 40 bit internal data path for exceptional dynamic range and sonic quality. A flexible 2 input, 4 output multi-mode format featuring a choice of 2 way / 4 way / 3 way + Sub Crossover, dual 16 / quad 8 band parametric equaliser and dual 14 / quad 5 band parametric equaliser with limiters. Each parametric section provides +15dB to -30dB of gain at any centre frequency 20Hz - 20kHz with a wide range of Q's from 0.4 to 128. All parameters feature fine resolution with 1/24 octave frequency steps, 0.1dB gain increments and 100 Q settings. Parametric sections 1 and 2 can be set for LF & HF shelving response. Four high performance limiters are provided, featuring a wide range of control over Attack, Release and Threshold parameters. A limiter display function provides four 'over-limit' meters simultaneously on the LCD display. Variable High and Low pass filters for each output can be set for 12, 18 and 24dB / octave slopes and a choice of Bessel, Butterworth or Linkwitz-Riley responses are available. Independent control over High & Lowpass functions allows asymmetric crossover functions to be realised. Phase reverse is selectable for each output. Three velocity-sensitive rotary encoders provide a familiar and easy to use control format with all filter information displayed simultaneously on a backlit LCD display. Channel and section 'Flat' keys are provided allowing A/B comparison, or equalisation to be pre-set and then dropped in.

DP200 Page 6

Delay of up to 682mS can be independently set for each output with a minimum increment of 21S. Comprehensive standard specification includes 40 memories, MIDI for external control & linking master / slave units, selectable operating level and multi-level security lock-out function. The DP200 provides exceptional audio quality with a full 103dB dynamic range, high sampling rate and minimal filtering. Wide range digital control of level is provided for each output. This also allows mute to be applied to any output. AES / EBU digital inputs and outputs are available as an option, with optical I/O also available to special order. Optional RS232,RS422 and RS485 interfaces are also available. These also provide for close-contact recall of memories 1 to 5, (or 1 to 31 using a binary encoded arrangement.)

DP200 Page 7

Front Panel Functions
1. Headroom Meter - Displays available headroom before system clipping occurs. The bottom six LED's display between 30dB and 0dB of input headroom, with the orange 0dB LED set at 3dB below clipping. The top, red LED displays digital overflow and can therefore light without all other LED's becoming illuminated. 2. Menu Key - Selects last used menu choice to be previewed on the LCD display. Pressing a second time selects the next menu choice. Menu selections can also be viewed more quickly by using the Frequency control. 3. Down Key - Moves the display backwards through the list of available function screens for the current output. [ Enter Key ] - With the menu LED lit, this key performs the 'enter' function allowing the option for the current menu selection to be displayed and then the chosen option confirmed. 4. Up Key - Moves the display forwards through the list of available function screens for the current output. [ Quit key ] - With menu LED lit, this key performs the 'quit' function, returning the unit to the basic default operating mode from the existing menu selection. 5. Section Flat Key - Allows the currently displayed equaliser section or limiter to be bypassed. The LED shows the status of the current section. (Note: The High and Lowpass filters can not be bypassed using this method.) When the display is showing 'delay time' holding this key down will cause the delay time control to be adjusted in larger increments allowing quick adjustment. If an output channel is selected and the display is showing Delay time, output phase will also be shown. 6. Chan. Flat Key - Allows all the equaliser sections apart from the high and lowpass filters to be bypassed for the current channel. The LED shows the status of the current channel. The overall channel gain control may be set to 0dB by this action if required, by selecting the 'Gain Bypass Option' (see menu options). 7. Scroll Key - Scrolls the screen through the available channels for the current configuration. 8. LCD Display - Shows menu options, output information and various parameters dependant on the menu selection. 9. Parameter Controls - The three rotary encoders allows the relevant parameter to be adjusted.

DP200 Page 8

Rear Panel Functions
1. Mains Power - is connected via a standard IEC socket. A compatible power cord is supplied with the unit. 2. Mains Fuse - is located in a finger-proof fuseholder adjacent to the mains inlet. Always replace this fuse with the correct type as shown on the rear panel legend. 3. Power Switch - a double pole rocker switch isolates both live and neutral connections. 4. Remote Interface - Standard units have MIDI In / Thru and Out connections via 5 pin DIN sockets. See page 25 for more information. Optional interfaces include RS232, RS422 and RS485. Please see information sheet provided with the option for more details. 5. XLR Inputs and Outputs - Separate 3 pin XLR connectors are provided for each audio input and output. All terminations are fully balanced where pin 2 = Hot, pin 3= Cold and pin 1 = Screen (shield). See page 32 for more information. 6. Digital Output 3+4 Switch - pressing this recessed switch will route the AES digital format of outputs 3 and 4 via output 3's XLR connector, if the AES/EBU option is fitted. 7. Digital Output 1+2 Switch - pressing this recessed switch will route the AES digital format of outputs 1 and 2 via output 1's XLR connector, if the AES/EBU option is fitted. 8. Digital Input Switch - pressing this recessed switch will change XLR Input A to a 2 channel AES digital format input, if the AES/EBU option is fitted.

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Operating the DP200
AudioCore Windows Operations
The following operating information covers control of the DP200 via front panel controls only. Please see additional information despatched with AudioCore software and interface options if computer control is required.

Preliminary Set-up

The following procedure should be followed when first installing the DP200. 1. Select correct unit configuration via menu. 2. Set maximum input level (operating level) via menu. To set the above options, press Menu to enter Menu Mode and scroll through menus until required choice is found, using menu or scroll keys or the frequency control. When the required menu choice is found, press Enter key, then use the scroll key to view options. The currently used option will be marked by a '*' star. To confirm a new option press enter again whilst required option is selected. Note: After 15 seconds the unit will return to normal 'default' mode. Repeat above instructions to return to menu mode.

Menu Selections

The following menu selections are available. To view menu selections see instructions under preliminary set-up above. Unit Configuration: Sets unit into one of the 10 operating modes: Quad 8 Band parametric (2 in, 4 out), Dual 16 Band parametric (2 in, 2 out), Stereo 16 band parametric, Quad 5 band parametric & limiters, Dual 14 band & limiters, Stereo 14 band & limiters, Dual 2 way crossover, Stereo 2 way crossover, Mono 4 way crossover or Split ( 3 way + Sub) crossover. See page 12 for more information. Maximum Input Level: Sets operating level to optimise dynamic range by increasing input level and decreasing output level. Selectable to +3dBu, +8dBu, +15dBu or +20dBu. See page 32 for more information. Inputs Dual / Mono: Selects two inputs; A and B (Dual) or one input A (Mono). With 'mono' selected this allows, in Quad mode for example, all 4 outputs to control different zones derived from a single input. Bypass Chan. Gain Mode: Selects whether channel flat function will set the overall channel gain to 0dB or not effect it. Limiter Link Mode: Once selected, if any one limiter's threshold is exceeded, equal gain reduction will be applied to all limiters. See page 23 for more information. Memory Store: Allows up to 40 settings to be stored and named. See page 24 for more information. Memory Recall: Allows recall of all currently used memories, as selected via the frequency control. See page 24 for more information.

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DP200 Configurations
To simplify set-up of the DP200, 10 configurations are menu selectable. These fall into three main groups:- Parametric equalisers, Parametric equalisers with limiters and Crossover modes. For detailed information on theses modes please study the block diagrams along with the following descriptions. Within each group, stereo modes are available to provide precise 'ganged' parameter adjustment for stereo sources.
Parametric Equaliser modes
Three modes are provided:- Quad 8 band (2 in 4 out), Dual 16 band (2in 2out) and Stereo 16 Band (2in 2 out with 'ganged' parameter control.) All modes feature a total of 32 bands of fully flexible parametric equalisation split between either 2 or 4 outputs, with sections 1 and 2 on each output selectable respectively to L.F. and H.F. shelving response. Separate high and low pass filters are provided for each output with adjustable turnover frequency and a choice of slopes. Delay time and output gain is also adjustable for each output. In dual and stereo 16 band modes, outputs 3 and 4 still operate, with signal being derived post e.q. but pre-delay. (Useful for feeding the main stacks in a delay tower installation).

Equalisation

(see page 29 for more information)
Each identical parametric section can be positioned at any frequency 20Hz to 20kHz and features a wide range of 'Q's to produce response curves ranging from broad to notch. 15dB boost and 30dB cut is provided with 0.1dB resolution. Frequency parameter features 1/24 octave resolution for precise control. Since all filtering is achieved in DSP all settings are re-settable with absolute accuracy and in stereo mode parameters track identically, Very narrow band notch filters can achieved, (maximum Q=128). Unlike analogue filters these 'tight' Q filters are entirely stable, maximum notch depth is 30dB. Parametric filters are carefully implemented using Double Precision processing. This method is costly in terms of processing power but yields substantial benefits in terms of the DP200's exceptional noise performance and greatly improved low frequency stability.

DP200 Page 12

Parametric Equalisation Block diagrams

INPUT A OUTPUT 1

OUTPUT 3

MONO LINK INPUT B

OUTPUT 2

OUTPUT 4

Figure 1 (Quad 8 Band) - 2 Input, 4 Output, 8 Band Parametric
MONO LINK PEQ PEQ PEQ PEQ PEQ PEQ PEQ PEQ PEQ GAIN

INPUT A OUTPUT 2

Figure 2 (Dual 16 Band) - 2 Input, 2 Output, 16 Band Parametric

INPUT A OUTPUT 3

INPUT B OUTPUT 1 PEQ PEQ PEQ PEQ PEQ PEQ
Figure 3 (Stereo 16 Band) - 2 Input, 2 Output, 16 Band Parametric

DP200 Page 13

Filter slopes

A choice of Bessel or Butterworth slopes at 12/18/24dB per octave and LinkwitzRiley at 24dB per octave are provided. Since Low and High pass functions are separately adjusted, asymmetric slopes are easily achieved if required. It should also be noted that the turnover frequency displayed on the DP200 is the -3dB point for all slopes except 24dB Linkwitz-Riley where the -6dB point is shown. If the -6dB point is to be used for the Bessel or Butterworth filter, take the required crossover frequency, multiply this by the appropriate factor from the following table and then select the closest available frequency on the DP200's display.
Filter Type Bessel 12dB/octave Butterworth 12dB/octave Bessel 18dB/octave Butterworth 18dB/octave Bessel 24dB/octave Butterworth 24dB/octave
High pass filter factors 1.45 1.31 1.37 1.19 1.35 1.15
Low pass filter factors 0.69 0.76 0.73 0.84 0.74 0.87
Please note that unlike conventional analogue crossovers, crossover points and slopes are set with absolute accuracy since component tolerance problems do not occur.

Time Alignment

A further advantage of the DP200 over conventional products is the provision of an independently adjustable delay section for each output. This allows the true arrival time from multiple drivers to precisely aligned rather than relying on the compromise 'phase adjust' approach. Delay time is adjustable in 21 micro-second steps (8mm). To convert from units of time (i.e. milliseconds) to units of distance use the following formula : 1 millisecond = 343mm (1.126ft) @ 20C (68F)
High performance digital limiters are provided for each output with control over attack time, release time and threshold level parameters ( see page 22 ). This level of control allows the user to balance the required subjective quality of the limiter against the driver protection requirements. It does also mean that an incorrectly set limiter may sound awful! In particular, as with all limiters, using too fast an attack or

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Crossover Block diagrams
INPUT A OUTPUT BAND PARAMETRIC EQ. GAIN DELAY PEQ PEQ DELAY GAIN LIMIT LEFT LF HPF LPF
OUTPUT 3 LEFT HF HPF LPF PEQ PEQ DELAY GAIN LIMIT
INPUT B OUTPUT BAND PARAMETRIC EQ. GAIN DELAY RIGHT LF HPF LPF PEQ PEQ DELAY GAIN LIMIT

OUTPUT 4 RIGHT HF HPF LPF PEQ PEQ DELAY GAIN LIMIT
Figure 7 (Dual 2 way Xover) - Dual 2 way Crossover with Limiters and Delay
INPUT A OUTPUT 1 LEFT LF 6 BAND PARAMETRIC EQ. INPUT B 6 BAND PARAMETRIC EQ. OUTPUT 2 GAIN DELAY HPF LPF PEQ PEQ DELAY GAIN LIMIT RIGHT LF

OUTPUT 3 LEFT HF

OUTPUT 4 HPF LPF PEQ PEQ DELAY GAIN LIMIT RIGHT HF
Figure 8 (Stereo 2 way Xover) - Stereo 2 way Crossover with Limiters and Delay
INPUT A OUTPUT BAND PARAMETRIC EQ. GAIN DELAY PEQ PEQ DELAY GAIN LIMIT LF HPF LPF
OUTPUT 3 LO MID HPF LPF PEQ PEQ DELAY GAIN LIMIT
OUTPUT 2 HI MID HPF LPF PEQ PEQ DELAY GAIN LIMIT
OUTPUT 4 HF HPF LPF PEQ PEQ DELAY GAIN LIMIT
Figure 9 (4 way Crossover) - 4 way Crossover with Limiters and Delay

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release time will result in excessive low frequency distortion. Please therefore ensure that all limiters are bypassed during initial set-up and use the following limiter parameter set-ups as a starting point.
High Pass Filter Frequency less than 50Hz 50Hz - 200Hz 200Hz - 400Hz 400Hz - 1k3Hz 1k3Hz - 4kHz 4kHz - 20kHz
Attack 80mS 80mS 60mS 40mS 20mS 10mS

Release S M M M M M

Once set, the limiter view screen can be set ( see page 23 ) this simultaneously displays the amount of gain reduction for all outputs on four separate 'over limit' meters. If required the limiter-link function can be selected via the menu system. Once selected, if any one limiter's threshold is exceeded, equal gain reduction will be applied to all limiters, so avoiding a dynamic change in system frequency response.
For each output a 2 band fully parametric equaliser section is provided. This allows for correction of driver frequency response, or compensation for the directional properties of the driver to be added. In addition a powerful 6 band parametric equaliser is provided on each input. This allows full room equalisation to be performed using the DP200 saving the cost, space and wiring requirements of external units.

Phase Reverse

Phase can be independently reversed for each output. See page 18 for more information.

Input Base Delay

In addition to the time alignment delay provided on each output, overall system delay can be applied using this facility. See page 18 for more information.

Input Level

Overall system gain can be set using this control. See page 18 for more information.

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Gain, Delay and Phase Function Screen
The gain and delay function screen controls the overall gain and delay of an individual input or output channel. Phase can also be set for each output channel.

Output:1 Delay=

+0.8dB 15.08mS
1. Menu Key - Selects menu functions. 2. Down and Up Keys - Moves the display backwards and forwards through the list of available function screens for the current channel. 3. [Delay *10] Key - Holding this key down will cause (a) the delay time control to be adjusted in 1 millisecond steps allowing quick adjustment and (b) the phase to be displayed if the current channel is an output. 4. Chan. Flat Key - Allows all the equaliser sections apart from the high and lowpass filters to be bypassed for the current channel. The LED shows the status of the current channel. The overall channel gain control may be set to 0dB by this action if required, by selecting the 'Gain Bypass Option' (see menu options). 5. Scroll Key - Scrolls the screen through the available channels for the current configuration. This includes input and output channels in crossover modes. 6. Channel - Shows current input or output channel selected. A '+' sign indicates a 'ganged' pair. 7. Gain - The actual gain setting for the current channel. 8. Delay - The actual delay setting for the current channel. 9. Delay Control - Adjusts the delay in 21 microsecond steps or 1 millisecond steps if the [Delay *10] is pressed. In crossover modes overall input Base delay is adjustable as well as output time alignment delay. 10. Gain Control - Adjusts the current channel gain in 0.1dB steps. The range is from +15dB to -40dB and mute for an output channel, 0dB to -40dB for input channels. With an output channel selected for adjustment, pressing the [Delay *10] key shows the phase, the gain control can then be used to switch the phase.

DP200 Page 21

12. Q Control - Adjusts the 'Q' of the filter. For PEQ numbers 1 and 2, adjusting the 'Q' below 0.4 will switch the filter into Low and High shelf modes respectively 13. Gain Control - Adjust the gain of the filter from -30dB to +15dB in 0.1dB steps, except -25dB to -30dB (1dB step). For Low and High shelf modes this is restricted to 15dB.
Limiter Control Function Screen
For configurations that allow limiters.
Output:1 Lim Atk:20mS'M'Thr:+8dB
Note:- Please see page 16 for limiter operating guidance. 1. Menu Key - Selects menu functions. 2. Down and Up Keys - Moves the display backwards and forwards through the list of available function screens for the current output. 3. Section Flat Key - Allows the current limiter to be bypassed for the current channel. The LED shows the status of the current limiter 4. Chan. Flat Key - Allows all the equaliser sections apart from the high and lowpass filters to be bypassed for the current channel. The LED shows the status of the current channel. The overall channel gain control may be set to 0dB by this action if required, by selecting the 'Gain Bypass Option' (see menu options). Note: This key does not bypass the limiter. 5. Scroll Key - Scrolls the screen through the available channels for the current configuration. 6. Output - Shows current output channel. A '+' sign indicates a 'ganged' pair. 7. Lim - Shows the amount of gain reduction for the current limiter as a real time bargraph in 1dB steps, from 0 to 9dB. 8. Atk - Shows the limiter attack time, from 1 to 99 milliseconds. 9. Rel - Shows the limiter release time as Fast, Medium or Slow. In the Fast setting the release time will be 4 times the Attack time. For Medium and Slow it will be 8 and 16 times respectively.

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10. Thr - Shows the threshold point of the limiter in dBu. The range is +20dB to 27dB in 1dB steps, depending on the operating level of the unit. 11. Frequency Control - Adjusts the attack time of the limiter. 12. Q Control - Adjust the release time of the limiter. 13. Gain Control - Adjust the threshold point of the limiter.

Memory Recall

Press 'MENU' and select Memory Recall using menu / scroll keys or parameter control. Press 'ENTER' to load selection. If after 15 seconds no recall has been implemented, the unit will return to the default mode.
Configuration - shows the current configuration used for the recalled memory. Memory No. and Name. - shows the memory selected for recalling. Use the frequency control to select the required memory. Only memory numbers containing stored information will be displayed. Frequency Control - used to select required memory. [Enter] key - Press this key to recall the memory number shown on the display.

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Security System
Press 'MENU' and select Security System using menu / scroll keys or parameter control. Press 'ENTER' to load selection. Press 'ENTER' again to access security system information. IMPORTANT - Please Note that once the security system is initiated only reentering the correct code number will 'unlock' the DP200's functions. Please note Code Number ! Security System Status - shows on or off status for the security system. Security Code No. - shows the code number currently selected. Any number between 0 & 9999 can be chosen via the frequency control. Frequency Control - Allows the required security code number to be selected. This number must be written down and saved for future use. Section Down key - Once the required security number has been selected, pressing this key initiates the security mode. [Delay *10] key - Holding down this key allows quick adjustment of security number. Note 1: To 'unlock' security system, enter security system via 'MENU' key, enter code number with frequency control and press the 'section down' key. Note 2: If the security code number is inadvertently lost contact your local XTA sales office.

MIDI Operation

The DP200 is supplied with a MIDI interface as standard. The unit can be placed in Off, Master and Slave modes. In 'Slave' mode the DP200 will monitor MIDI messages on the MIDI input connector and will respond to 'program change' commands from either another DP200 (set in 'Master' mode), or a separate MIDI events controller by recalling a DP200 memory corresponding to the 'program change' number. In this way, changes in delay time, gain and equalisation can be instantly implemented. MIDI channel numbers 1 to 16 plus 'All' (omni) are selectable. The unit will also respond to system exclusive commands sent via AudioCore control software. In 'Master' mode the DP200 will send a MIDI 'program change' command via the MIDI output connector when a memory is recalled. The 'program change' number is the same as the DP200 memory number being recalled (i.e. 1 to 40), therefore if a Master DP200 is used to control a number of Slave DP200 units, the correct setting must be loaded into the same memory number on each unit. In 'Master' mode MIDI channel numbers 1 to 16 are selectable. Press 'MENU' and select Interface Set-up using menu / scroll keys or parameter control. Press the 'section down' key to load selection. Use frequency control to select between Slave, Master and Off modes and confirm by pressing the 'section down' key.

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MIDI Channel Number - shows Slave or Master MIDI channel number. The active channel number is identified by a '*'. Frequency Control - Allows the channel number to be adjusted. Enter key - Pressing this key confirms the channel number currently selected as active.
RS232, RS422 and RS485 Operation
These optional interfaces replace the standard MIDI interface. The unit can be placed in Off, Master and Slave modes. In 'Slave' mode the DP200 will monitor messages from either AudioCore software or another DP200 (set in 'Master' mode). In 'Master' mode the DP200 will send a memory recall command when a memory is recalled. Press 'MENU' and select Interface Set-up using menu / scroll keys or parameter control. Press the 'section down' key to load selection. Use frequency control to select between Slave, Master and Off modes and confirm by pressing the 'section down' key. Baud - shows Slave or Master mode baud rate (9600, 19200, 38400). The current rate is identified by a '*'. Frequency Control - Allows the mode and baud rate to be adjusted. Enter key - Pressing this key confirms the mode and baud rate currently selected as active.

Password Locking

Caution: Do not enter this menu option before reading and understanding these instructions. Any Password entered must be written down and kept for future use, since this must be re-entered to unlock functions. Security is organised into two levels designated Supervisor and User, allowing, for example, the Supervisor to lock all main system functions, e.g.: configuration, crossover slopes and output EQ., but leaving the User access to input delay and input EQ. etc. The User can still in turn lock some or all of the functions he has access to. To set password locking, press [MENU] and select password locking using the Frequency control. Press [ENTER] to load selection. (If after 15 seconds no adjustment is made, the unit will return to the default mode). Use the Frequency control and the [ENTER] key to select either Supervisor or User security level. The display will show either **** or the current four character password for the selected security level if the system is in the unlocked mode. If the system is in the unlocked mode the password can be modified at this point if required, otherwise

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enter a password, if the current password is blank (4 spaces) any password will be accepted otherwise only the correct password will be accepted. To enter a password use the Frequency control to select the character and the [SCROLL] key to select the position, press [ENTER] when ready. (Note: When setting a new password any characters left as * will be stored as a space ( ). To re-enter the password they must be set as a space). If the correct password has been entered the display will show the Section lockout screens. The sections that can be locked are:- Input Gain, Input Delay, Input PEQ, HPF & LPF, Limiters, Output PEQ, Output Gain and Output Delay. The lock levels available for each section are:1. No Lock - The section is displayed and controlled as normal. 2. Control - The section is displayed but not adjustable. 3. Display - The section is not displayed or adjustable. To move through the section list press the [MENU] key, the current lock level for each section will be shown. To change the lock level use the Frequency control and the [ENTER] key to set the new lock level. At the end of the list the display will show Press ENTER to enforce Locking, press the [ENTER] key to go into the locked mode or the [QUIT] key to go into the unlocked mode. If the security level is Supervisor and the [ENTER] key was pressed to enforce locking, the display will show Press ENTER to CLEAR all USER locking, press the [ENTER] key to clear all the User set locks and the User password. Note 1: In User security level only the sections not locked by the Supervisor will be accessible. Note 2: If the unit is left in the unlocked mode it will automatically go into the locked mode at power-on. Note 3: To clear a password do the following sequence. Enter the correct password set all sections to No Lock. Press the [QUIT] key, leaving the unit in the unlocked mode. Press the [MENU] then the [ENTER] key, the display will show the current password, change this to all spaces and press the [ENTER] key. Note 4: When any section is locked and the unit is in the locked mode, no change in the units configuration is possible.

AES/EBU Units

Connections (see Page 9 for more information) Connection of AES/EBU signals is via the existing rear panel XLR connectors. Three recessed switches are provided on the rear panel allowing selection of Analogue or AES digital format for these connectors. With these switches set for AES/EBU; Inputs A and B are provided on Input A connector, Outputs 1 and 2 on Output 1 connector and Outputs 3 and 4 on Output 3 connector.
With the AES/EBU option fitted, AES Receive and Diagnostic modes are provided. AES Receive Mode:

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IMPORTANT: The functions of AES Receive modes 1 and 4 are discussed for the purpose of completeness only, since their use is limited on the standard (nonoptical) AES/EBU unit. Since simultaneous AES/analogue signals are not possible on the standard unit, the auto mode will normally be used, with manual selection of AES or analogue source still required via the rear panel switch. To access this mode, press [MENU] and select AES receive mode using [MENU]/[SCROLL] keys or Frequency control, then press [ENTER]. Use Frequency control to view options as follows:1. Analogue - Input is analogue only. Any AES/EBU signal is ignored. 2. AES - Inputs is always AES/EBU. If the AES/EBU signal is corrupt, outputs will mute. Analogue input signal is ignored. 3. Auto - If a valid AES/EBU signal is detected this is used as the preferred source. If an invalid AES/EBU signal is present (or no AES/EBU signal) then the analogue signal will be used, if available. 4. Reference - Input is selected to analogue, but the external AES signal is used to control the sample rate of the DP200. In this way the AES/EBU outputs are referenced-locked to the incoming AES clock. AES Diagnostics: The DP200 includes comprehensive AES/EBU diagnostic programs to enable the incoming signal to be checked for quality and validity. To access this mode, press [MENU] and select AES Diagnostics, using the Frequency control, the press [ENTER]. If no valid AES signal is present the display will show AES status: not locked. If the signal is present, pressing the scroll key selects between the following options:AES Status: 1. Not Locked - No valid AES signal present. 2. OK - Valid AES signal present. 3. Chan Stat Chg - Channel status change. 4. SLIP - Shows errors are present due to non-synchronous clock. AES Errors: 1. None - No errors present. 2. CNF - Confidence ( quality of signal). 3. Code - error in AES code (bi-phase coding error). 4. Parity - error in AES code (bit error). 5. Validity - error in AES code (validity bit set). AES Frequency: Displays current AES clock rate and tolerance, e.g. 48 kHz +/- 400 ppm.

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Equalisation Curves
Figure 10 - Parametric filter gain curves.
Figure 11 - Parametric filter 'Q' curves.
Figure 12 - Parametric filter High and Low shelf curves.

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Figure 13 - Highpass filter curves.
Figure 14 - Lowpass filter curves.
Figure 15 - Parametric filter with high 'Q' to achieve notch response.

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Specifications
Inputs Impedance CMRR Outputs Source Imp Min. Load Max. Level Frequency Resp. Dynamic Range Distortion Maximum Delay Output gain Input gain Two electronically balanced. > 10k ohms. >65dB 50Hz - 10kHz. Four electronically balanced. < 60ohms. 600ohm. +20dBm into 600 ohm load. 0.5dB 20Hz - 20kHz. >103dB 20Hz -20kHz. unwtd. < 0.02% @ 1kHz, +18dBm. 682 mS. (increment 21 S) Adjustable +15dB to -40dB in 0.1dB steps and mute. Adjustable 0dB to -40dB in 0.1dB steps. (crossover modes only)
Parametric Equalisation Filters 8 Sections per output ( 16 in Dual mode). Filter gain +15dB to -30dB in 0.1dB steps. Centre frequency 20Hz - 20kHz, 1/24 octave steps. (240 positions) Filter Q 0.4 to 128 (Sections 1 & 2 switchable to Shelving response) Low frequency 20Hz - 1kHz High frequency 1kHz - 20kHz Shelf gains 15dB in 0.1dB steps. High and Lowpass Filters Filters 1 of each per output. Frequency (HPF) 10Hz - 16kHz, 1/24 octave steps. Frequency (LPF) 60Hz - 22kHz, 1/24 octave steps. Response Bessel / Butterworth 12/18/24dB per octave and Linkwitz-Riley 24dB per octave. Limiters Threshold +20dBu to -27dBu (dependant on operating level). Attack time 1 to 99 milliseconds. Release time 4, 8 or 16 times the attack time.(Slow, Medium, Fast) Operating level Display Headroom meter Connectors Inputs Outputs MIDI Power Power Consumption Weight Size Optional Interfaces Options Headroom selectable +3dB, +8dB, +15dB & +20dB. 2 x 20 character backlit LCD. 2 x 7 point, -30dB to clip. 3 pin female XLR. 3 pin male XLR. In / Out / Thru 5 pin DIN. 3 pin IEC. 110 / 220 V 15% @ 50/60Hz. < 20 watts. 3.5kg. Net (4.8kg. Shipping) 1.75"(1U) * 19" * 11.8" (44 * 482 * 300mm) excluding connectors. RS232 (9 way DEE), RS422 (9 way DEE) and RS485 (8way RJ45 x 2). These options also provide closedcontact memory recall via 8 pin DIN socket. = Transformers available. Relay bypass. Digital I/O.
Due to continuing product improvement the above specifications are subject to change.

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Operating Notes

Operating Level With any audio signal processing equipment it is necessary to ensure adequate signal level is used through the device, to avoid sacrificing noise performance. The DP200 features a menu selectable choice of operating levels to reduce this problem, (see page 10). It is suggested that the operating level chosen should give adequate level to just light the 6dB LED on the headroom meter with maximum program level being used. Since the meter is deliberately set to 'over-read' by 3dB, this still provides 9dB of headroom before clipping occurs. With equalisation in use it may be necessary to further reduce the input level, as gain within the unit may cause digital clipping, indicated by the top red LED's lighting. It should be noted that the figure quoted for the maximum input level options is the clipping point for that option ( not a safe operating level ). Always ensure that this clipping point is no lower than that for the following equipment in the signal chain, and allow extra margin if equalisation sections are boosted. Grounding. The Screen (shield) pins on all audio connectors are normally connected directly to the ground pin of the IEC mains inlet. The chassis is also directly connected to this pin. Never operate this unit without the mains safety ground connected. Signal ground (0V) is in turn connected to the chassis ground. To avoid ground loops, cable shields should be connected to ground at one end only. The normal convention is that the shield is only connected at the output XLR. Provision is also made for separately isolating each input and output shield pin permanently within the DP200 by breaking the appropriate PCB track, where marked with a box and an 'X' next to each XLR connector using a small drill bit or cutter. See the following diagram for details.
XLR Pin 1 Isolation points
Figure 16 - XLR pin 1 Isolation points

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Warranty
This product is warranted against defects in components and workmanship only, for a period of one year from the date of shipment to the end user. During the warranty period, XTA will, at it's option, either repair or replace products which prove to be defective, provided that the product is returned, shipping prepaid, to an authorised XTA service facility. Defects caused by unauthorised modifications, misuse, negligence, act of God or accident, or any use of this product that is not in accordance with the instructions provided by XTA, are not covered by this warranty. This warranty is exclusive and no other warranty is expressed or implied. XTA is not liable for consequential damages.

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