M O D E L

I N F O R M A T I O N

Integrated Amplifier

PMA-255UK
ack in 1986, DENON started the UK Design amplifier trend with the PMA-707 which was tuned for the fiercely competitive UK market. Since then the very successful PMA-250 series has been designed in the UK and built in Europe by DENON Germany, all in close co-operation with DENON Japan. Although the PMA-255UK uses the chassis and fascia of the previous PMA-250SE, the internals are bigger, beefier and all new. Rated at a conservative 30 watts the sound is more subtle, better focused and the PMA-255UK kicks hard, sounding like a much bigger amp. The new design also delivers superior bass power & drive with better load handling.
Totally new UK designed circuitry Rated at 30 watts into 8 ohms s 4 line inputs, 1 tape circuit s Full tone controls with straight-line bypass

Key Design Features

Short path design with new high current - low distortion output transistors ELNA audiophile grade power supply reservoir caps - custom made for DENON New high current - low distortion output transistors Selected quality output relays for mute & protection in a short-circuit proof design Selected JRC audio control amp - running from its own discrete regulated power supply Audiophile components in drive & feedback paths 15 new generation polypropylene film caps & selected Silken electrolytic bypass caps High current copper bus bar for central ground line Direct hardwired from power amp to speaker terminals Pure symmetrical power amplifier amp design Full tone controls with straight-line bypass Double insulated design to prevent ground loops
Specifications s Power Amp Section Rated output, both channels driven.. 30 W + 30 W (8 ohms, 20 - 20 kHz, 0.7%THD) 50 W + 50 W (4 ohms, 1 kHz, 0.7%THD) s Preamplifier Section Input sensitivity/impedance.. 150 mV/47 k (Source Direct OFF) 150 mV/20 k (Source Direct ON) Frequency response.. 10 Hz - 80 kHz (0, -3 dB) s General Characteristics S/N ratio (A network).. 98 dB (input terminals shorted / Source Direct ON) Tone controls.. 100 Hz 8 dB (BASS), 10 kHz 8 dB (TREBLE) s Other Specifications Power supply.. 230 V, 50 Hz Power consumption.. 120 W (IEC) Dimensions.. 434 (W) x 115 (H) x 286 (D) mm Weight.. 5.5 kg
*Design and specifications are subject to change without notice.
HAYDEN LABORATORIES LTD. Chiltern Hill Chalfont St Peter, Gerrards Cross, Bucks SL9 9UG UK Tel: 01753-888447, Fax: 01753-880109 NIPPON COLUMBIA CO., LTD. 14-14, AKASAKA 4-CHOME, MINATO-KU, TOKYO 107-8011, JAPAN http://www.denon.co.jp

25260700B UK

IHR System for Predicting and Monitoring Outcomes from Cochlear Implantation in Adults (POCIA)
(latest revision: JRF:06-Oct-97)
Suggested Equipment and Configuration

Printer

Standard Screen

PC running Windows

Touch Screen Video Laser Disc TV Monitor
CD-ROM Drive Sound Card Audio Mixer Audio Amplifier Loudspeaker
Recommended Configuration The following items are recommended if you are buying hardware from scratch and want a system that will be capable of supporting tests using digital video in the future. Item 1. PC Description/Supplier (e.g.) Viglen Genie ATX 120 MHz Pentium Processor (or faster) 16 Mbytes of Memory (or more) 1 Gbyte Hard Disk (or larger) 15 inch Colour VDU CD-ROM Drive Additional Video Memory Creative Labs SoundBlaster 16 (for PC) MicroTouch IIYAMA Vision Master 17 (MF-8617E) Pioneer LD-V4300D and CC-13 Cable (e.g.) JVC TM-14EK(B) 14 inch Colour (e.g.) interM (or inkel) MX-880E (e.g.) Denon PMA-250SE (e.g.) Mordaunt-Short MS 10I (pair) Videk DSHD 15-2 (Stock No 9430: 2 to1, 15-way VGA) RS Components Fellowes LiteView 14/15ins (for video monitor) (RS) Farnell Components UCH/Mdx Cochlear Implant Programme (e.g.) Hewlett Packard DeskJet 690C (Viglen) Approx. Cost (1996, ex VAT)
2. Sound Card 3. Touch Screen 4. Video LaserDisc Player 5. Video Monitor 6. Audio Mixer 7. Audio Amplifier 8. Loudspeaker 9. Data Switch 10. Anti-static Mat Kit 11. Anti-static Screen 12. Mains Distrib. Boards 13. Video LaserDisc 14. Printer (optional) Total

poeqpt.doc

AL : 22/05/2008

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POCIA: Addresses for Suppliers Notes These are the suppliers used by IHR. Some equipment, especially audio and audiovisual equipment, may be easier to obtain from suppliers with which you already have local arrangements. Some items of equipment may no longer be available or may have been replaced with newer alternatives. Compatible alternatives should be satisfactory, especially those given as e.g. in the list. Prices are given as an approximate guide: in some cases we obtained discount for medical, educational or research use, or for a bulk order. A more powerful PC is likely to be available for the same price now, and would be acceptable (or even preferable). For Additional Video Memory in the PC, we used the Matrox MGA Millennium Card (with 2 MB of WRAM): newer replacements are likely to cover requirements. The system uses two serial ports on the PC (COM1: for the Touch Screen and COM2: for the Video LaserDisc Player), so a PS/2 mouse is preferable to a serial mouse. A further serial port may be required if the PC is also used for programming cochlear implants. We particularly recommend the Creative Labs SoundBlaster 16 Sound Card, as we have had some problems with cheaper, supposedly compatible, alternatives. Specifically, an unidentified SoundBlaster 16 Compatible card supplied by Viglen gave more extraneous noises unrelated to the waveform, and measurably higher distortion. Pioneer may prefer to use local suppliers for single orders and for service support. The Audio Mixer needs to be able to adjust the levels of four line inputs and mix them all into one line output. A single audio channel then goes via the amplifier to a single loudspeaker. Addresses Viglen (for PC and Printer): Viglen Ltd Viglen House Alperton Lane Alperton Middlesex HA0 1DX Tel: (0181) 758 7001

(0181) 758 7080

Simply Computers (for Creative Labs Sound Card): Simply Computers Ltd 28 Walthamstow Business Centre Clifford Road Walthamstow London E17 4SX Tel: (0181) Fax: MicroTouch (for Touch Screen): MicroTouch Systems Ltd Thame Park Business Centre Wenman Road Thame Oxon OX9 3FR Tel: (01844) 260123 Fax:

(0181) 498 2159

(01844) 260012

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Pioneer (for Video LaserDisc Player): Pioneer High Fidelity (GB) Ltd Pioneer House Hollybush Hill Stoke Poges Slough SL2 4QP Tel: (01753) 789789 Fax: (01753) 664001 Tel: (01753) 885549 for Andrew Wilson direct Nottingham Audio Visual (local supplier for Video Monitor): Nottingham Audio Visual Services Ltd 255 Derby Road Bramcote Nottingham NG9 3JA Tel: (0115) Fax: (0115) John Kirk Hi Fi (local supplier for Audio Mixer, Audio Amplifier, Loudspeaker): John Kirk Hi Fi 70 Chilwell Road Beeston Nottingham NG9 1FQ Tel: (0115) Videk (for Data Switch): Videk Ltd Kingsbury Trading Estate Kingsbury Road London NW9 8RW Tel: (0181) RS Components Ltd PO Box 99 Corby Northants NN17 9RS Tel: (01536) 201201

(0181) 200 6494

RS Components (for Anti-static Mat Kit, Anti-Static Screen, leads):

(01536) 201501

Farnell Components (for Mains Distribution Boards): Farnell Electronic Components Ltd Canal Road Leeds LS12 2TU Tel: (0113) Fax: (0113) UCH/Mdx Cochlear Implant Programme (for Video LaserDisc): Ms Wanda Aleksy Cochlear Implant Programme The Nuffield Centre Royal National T, N & Ear Hospital 330 Gray's Inn Road London WC1X 8EE Tel: (0171) Fax: (0171) 915 1303

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POCIA: Equipment Setup Notes These were prepared as brief notes to help John Foster and David Marshall to set up equipment, and are offered as being possibly helpful to others, though parts may be rather cryptic and specific to particular equipment. Space Requirements Overall space at least 2m square, preferably more. Table at least 1.5m long with at least 0.5m at (left) end for tester's chair, preferably more. Table at least 0.55m deep (>0.6m preferable) with at least 1m at front for patient's chair and a further approx. 0.5m, preferably more, before any wall (to avoid too much sound reflection). Table of convenient height, eg approx. 0.75m, with space underneath for PC, Extension Boards and wiring, possibly also for Amplifier and Mixer. 2 mains sockets (13 Amp, 3 pin). Adequate lighting. Quiet surroundings. Ideally, a sound-proof test room with walls which reflect little sound. Suggested Layout Put Anti-Static Table Mat out first and cut to size if necessary Speaker TV+Screen VDU Switch front: Mouse TouchVDU Keyboard VLD Mixer Amplifier Printer

Notes and Connections PC and 2 Distribution Boards go on the floor Ordinary VDU faces tester's chair (left?) at end of table TV and Speaker are angled to face patient's chair (1m away) Anti-Static Screen: 2nd hole down in brackets, velcro to TV Speaker: wood of cabinet at front edge of TV, velcro to TV DataSwitch: A:VDU, B:TouchVDU, I/O:PC VGA PC: 9 connectors: Mains In, Mains Out:TouchVDU, VGA:DataSwitch, Keyboard, Mouse, Printer, COM1:TouchVDU, COM2:VLD, SoundCard LineOut:Mixer Anti-Static: Screen, Table Mat, Floor Mat, Mouse Mat to Plate to Plug Mains: 8 Plugs to 2 Distribution Boards to 2 Wall Sockets Sound: Mixer: 1:VLD L, 2:VLD R, 3:SC L, 4:SC R Out L:Amplifier AUX-2 L, SPKR L:Speaker Video: VLD:TV Mixer: Approx levels 1:-5, 2:-20, 3:-10, 4:-10, MASTER L:-10 5/6, 7/8, MASTER R: all minimum (LINE, EQ:Centre, EFX:0, PAN:Centre, PFL:Out) Amp: Source Direct ON (bypass balance and tone controls) Volume approx: Top Centre (Bass, Treble, Balance: all Centre, Input:AUX-2) Check: Audio, Video & audio, VDUs setup, Printer ink & setup, Calibration

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PC Port Settings for Video LaserDisc The program VLDWAV (from 19-May-97 version) sets up the PC port mode for the Video LaserDisc Player (eg mode com2:4800,n,8,1 (baud, parity, data bits, stop bits)) independent of DOS or Windows Control Panel, Ports, but may give errors if the default port addresses and interrupts are not used (eg com2: default address 02F8, IRQ3). SoundBlaster Sound Card Notes on Creative Mixer Settings Preferences: Save Settings on Exit (disable once required settings saved?) WAV Level Max, Balance Centre (WAV Levels are the only things reset by VLDWAV wav.bas Sub wavlevel) Master Level Max, Balance Centre Tone Controls (Treble and Bass) Centre (may reset to just above?) Output Gain L&R x2 No other inputs selected Recording Settings: none selected, no AGC, Gain L&R x1 Some settings get saved to c:\windows\ctmixer.ini (on exit from Creative Mixer if Save Settings on Exit is set) MasterVolume=31,31 VoiceVolume=31,31 (ie WAV volume) (others Volume=0,0 or 0 etc) Some settings get saved to c:\windows\system.ini [sndblast.drv] (less clear when this happens and unclear which are hardware and which software settings) MasterWaveIn=ffffffff MasterVoiceIn=ffffffff (others In=0) MasterVolume=31,31 VoiceVolume=31,31 (ie WAV volume) (others Volume=0,0 or 0) TrebleTone=8,8 (ie "0dB" in "-14 to +14dB range") BassTone=8,8 (may be best to edit these directly) OutputGain=1,1 (ie x2) RecordGain=0,0 (ie x1) AGC=0

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