Jeff Rowland Coherence
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Jeff Rowland Coherence Annexe 1
Jeff Rowland Coherence
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COHERENCE ONE PREAMPLIFIER
TABLE OF CONTENTS Introduction Features Unpacking Instructions Installation Phono Cartridge Loading Basic Troubleshooting Technical Specifications
Introduction Congratulations on your purchase of the Jeff Rowland Design Group Coherence One Series II Preamplifier. Please take a few moments to read this owners manual. Contrary to popular belief, there is actually quite a bit of useful information in an owners manual. The Coherence One Series II offers tremendous interconnection flexibility regardless of the amplifier used. A thorough understanding of your preamplifier now can save you a lot of anxiety later.
PLEASE NOTE: THE COHERENCE ONE SERIES II IS IN NO WAY COMPATIBLE WITH EARLIER COHERENCE ONE PREAMPS. DO NOT INTERCHANGE OLD AND NEW POWER SUPPLIES FOR ANY REASON!
Features The preamplifier is designed to rest on top of its power supply so the user-friendly pair can be handled easily. Special shielding techniques allow for this configuration, and "hum field" contamination has been eliminated.
Lighted, feather-touch mode switches electronically control signal. The front panel switches do not alter sonic integrity, since signal switching is accomplished at the preamplifier input stage. Absolute phase reversal and full muting are other essential front panel control functions. A selectable tape output section allows simultaneous recording from one source while listening to another. "Record Out: Off" position disconnects tape recorder inputs from tape out jacks, eliminating loading problems when tape recorder is not in use. Volume controls are chosen for their sonic neutrality. Separate right and left trim potentiometers provide 6 dB adjustment for full rotation, permitting precise channel balance. Input and output jacks are gold-plated, ground-fault protected connectors, which provide tight, corrosionfree connections. Simultaneous normal and inverting outputs allow for balanced cable operation. Extremely low-noise phono sections eliminate the need for extra circuitry when using low output moving coil cartridges. The phono modules of the Coherence One Series II have been optimized for use with moving coil cartridges; for moving magnet cartridges, a module exchange can be easily accomplished by the user. Please contact Jeff Rowland Design Group from more details. All main outputs are muted temporarily during initial power application, power drop or disruption. DC potential across outputs, regardless of source, will also cause a muted condition. All signal amplification utilizes high-voltage, high-current, Class A field effect transistor technology. All inputs and outputs are direct-coupled, thus eliminating the deleterious effects of capacitors in the signal path. Precise RIAA equalization is the result of a split-passive network in the phono section. Incorporation of two-stage power supply regulation: A separate outboard power supply provides tight regulation regardless of power company extremes. Additionally, this discrete component design is optimized for excellent transient behavior, thus providing very low output impedance beyond 100 kHz. DC power is routed, via a power cable with a locking connector, to the main preamplifier circuit board. Compensating for power cable and circuit board inductance effects, sixteen (16) feedback-free discrete regulators adjacent to each module complete DC power distribution. This total system, in addition to separate channel balance controls, provides dual mono operation and precise regulation at each stage throughout. Time-related distortion, particularly in low-level phono stages, is eliminated by a totally feedback-free design. Mil-spec circuit board material, with oxygen-free copper traces and high-temperature mask provides superior electrical characteristics. All signal switching is accomplished with hermetically sealed, gold- contact signal relays. AC power line filter offers excellent line noise rejection. All critical circuitry is encapsulated in a thermally-conductive epoxy to ensure excellent thermal stability, mechanical integrity and to facilitate ease of service
Unpacking Instructions In the shipping crate you will find: AC Power Cord Replacement Fuses Phono Cartridge Loading Resistors Cartridge Loading Adjustment Tool Hex Key (for lid removal) Warranty Card (This form must be completed and returned to Jeff Rowland Design Group [or its authorized distributor if outside the U.S.A.] within 14 days of purchase. Not only will your preamplifier be registered, but you will, in the future, be informed of new products and services.) We strongly suggest that you save all packing materials
The preamp can be lifted out of its crate while still wrapped in the plastic bag. The foam pieces can then be removed from the sides and from between the preamp chassis. Installation Please make sure that the preamplifier DC power cable is connected to the power supply before attaching the AC line cord. Locate the preamplifier as close as possible to its final installation point. Allow access to the back panel for making connections. All Jeff Rowland Design Group products are convection cooled, eliminating the need for a fan. When operating, the preamp should have at least 2 inches of space on all sides. When the preamp is in position, the AC power cord should be inserted first at the inlet on the back panel of the power supply chassis, then connected to an appropriate power source. The preamplifier is equipped with a power switch, located and identified on the rear panel. The power switch should be turned on initially after plugging in the AC power cord. A few seconds after turning on the Coherence One, you will be able to use the lighted switches on the preamps front panel. The rear panel power switch should be left on at all times, maintaining stable operating parameters and thereby improving performance, reliability and longevity. Power consumption in stand-by mode is less than 50 watts, providing low-cost operation. If the front panel switches do not light, the preamplifier does not power up or a fuse blows, disconnect AC power, refer to the troubleshooting section of this manual or contact your dealer. Phono Cartridge Loading For a moving coil cartridge, the correct loading value of the preamp is generally determined by multiplying the DC resistance of the cartridge by ten (10). Usually this value is less than 200 ohms for a low output moving coil cartridge; there are times, however, that the optimum loading value must be determined empirically. Your Coherence One Series II preamp enables you to find this value and then, if desired, install a precision resistor at the phono input. Consultation with your local dealer and/or of your phono cartridge owners manual can also be beneficial. While facing the front of your Coherence One, remove the preamp lid. In the upper left hand corner of the preamp, at the phono input, you will see two (2) red jumpers (they look like little suitcases). You can choose from three (3) loading options by positioning the jumpers as shown on page 7. In the fixed load position, a resistor is soldered across the turret terminals labeled "Load" on each channel. If you use a resistor other than one supplied by Jeff Rowland Design Group, make sure it is a high-quality, metal film resistor.
In the variable load position, you can adjust the loading of your cartridge, listen to the results, and then decide what value gives you the best sound. On the back of the preamp chassis, adjacent to the phono inputs, you will find two (2) small holes. By inserting the supplied adjustment tool and turning each potentiometer, you can change the preamps resistance. When you have found the resistance that provides the best sonic results, measure this value at the phono input jacks. Then solder the correct value resistor across the inputs. (Your dealer can provide this service if desired.) Of course, you could simply find the position that sounds best and not solder a resistor in. But for the best results, you should! In the 47 k ohm load position, an internal resistor provides the loading necessary for most moving magnet cartridges. If you want to go a step farther, place the jumpers in the fixed load position and solder in a high quality capacitor as a load for moving magnet cartridges. The resistive loading will still remain 47 k ohms in the fixed position.
Basic Troubleshooting If your preamplifier does not turn on: 1. Make sure the power cord is connected to both the inlet at the back of the amp and an appropriate AC power source. 2. Check the fuse located next to the AC inlet; there are two fuses-one is a spare. A fuse can often look good even if it is actually bad. If possible, check it with a meter.
If your preamplifier shuts down after being turned on. with or without the presence of signal: Disconnect the inputs from the preamp and see if it will power up again. Your preamplifier will generally only shut down if it senses DC, thus protecting your amplifier and speakers. Certain associated equipment can occasionally pass DC. If the above suggestions do not work or you are having other problems, please contact your Jeff Rowland Design Group dealer.
Coherence One Series II
Phono Stage: Gain RIAA Accuracy Input Impedance THD and Noise Max Output Level Line Stage: Gain Response Input Impedance Output Impedance THD and Noise Max Output Level
60 dB 20 Hz to 20 kHz 0.15 dB; +0, -3 dB, 200 kHz User selectable: 0-200 ohms adjustable, 47 k ohm fixed or any value. < 0.025% @ 1 kHz, 0.7 V RMS output 18 V RMS 19 dB 2 to 250 kHz, +0, -3 dB 10 k ohms 300 ohms (single-ended output) 600 ohms (balanced output) < 0.010% @ 1 kHz, 3 V RMS output > 9V RMS
D E S I G N G R O U P
Coherence Stereo Preamplifier Owners Manual
Introduction Welcome to the Jeff Rowland Design Group family and congratulations on your purchase of what is unquestionably
one of the worlds finest audio preamplifiers. With its combination of industrial grade active and passive devices, precision electronic circuitry and accurately machined chassis components throughout, your Coherence Preamplifier will offer you many years of musically satisfying enjoyment. Owners Manual. Please take a few moments to read the remainder of this Jeff Rowland Design Group, Inc. 2911 North Prospect Street Colorado Springs, CO 80907 Phone: 719/473-1181 Fax: 719/633-4158
A thorough understanding of the operational features will allow you to gain the maximum Please note that your Preamplifier must be
performance and ease of use for which this Preamplifier was designed. used with its companion Power Supply. and also recorded below.
The serial number of each component is located on the rear panel of each,
The Preamplifier serial number begins with the letter C and the Power Supply serial Please include these numbers with any correspondence regarding your Coherence
number begins with the letter D. Preamplifier.
It has been my joy to create an audio component of enduring value which will reflect a higher ideal of It is my hope that these qualities will enrich your experience of ownership.
musical and artistic expression. Enjoy the music!
Jeff Rowland President
Seven balanced XLR inputs per channel. Two balanced XLR main outputs per channel. Two balanced XLR record outputs per channel. One balanced XLR bypass input per channel for use in home theater installations. All inputs and outputs can be used with single-ended RCA terminated interconnects by using XLR/RCA adapters (one male stereo pair and one female stereo pair supplied). Independent Listen and Record functions on each input permit simultaneous listening and recording from any two selected inputs. Each input can be individually adjusted for R/L balance, mono/stereo, absolute phase, input impedance, and gain, exclusively independent of every other input. Individually adjusted input settings are automatically memorized and recalled when returning to that input. Built-in pink noise generator facilitates break-in of preamplifier components and interconnected associated components. Six-function hand-held IR remote control with separate IR sensor/ display unit for remote IR reception and volume level indication. Chassis and all chassis components precision machined from 6061 aluminum plate provide maximum mechanical resonance control. All operational functions are under microprocessor control. Within five milliseconds of any function selected, the microprocessor reverts to a non-clocking sleep mode which eliminates any possibility of digital noise contamination. Transformer-coupled inputs and main outputs provide maximum immunity from RF contamination and system ground loops and enhance compatibility with a wide variety of interconnected components.
Power Supply Features
Separate power supply provides a stable, low noise DC power source utilizing reliable, long-life sealed lead-calcium batteries. Microprocessor controlled charge-management system ensures optimum battery operation under all conditions. The microprocessor is normally in non-clocking sleep mode, except when servicing a short-term operational command. Two separate power supply outputs for powering additional companion units such as an optional phono equalizer. Front panel AC/DC mode switch disconnects AC power when DC mode (pure battery) operation is selected. Chassis and all chassis components precision machined from 6061 aluminum plate provide maximum mechanical resonance control.
Introduction / Product Features
Initial Inspection Inspect the shipping container for damage. If the shipping container, packing material, amplifier or accessories are damaged or missing, notify your dealer and the shipper (if a claim is to be made). Note: Many shippers require notification and an inspection within twenty-four (24) hours of delivery to ascertain the nature of damages incurred.
Your Coherence Preamplifier has undergone extensive performance evaluations, listening tests, quality control inspections and a minimum seventy-two (72) hour burn-in period prior to shipment and should be in a perfect operational condition upon receipt. If the Preamplifier does not operate correctly, please notify your dealer immediately. We strongly suggest that you save all packing materials. If the Preamplifier is returned to your dealer or Jeff Rowland Design Group, the original packing materials must be used for shipment. Neither Jeff Rowland Design Group nor the shipper can be held responsible for damages incurred during transit if the original factory packing is not used. All factory returns require that a Return Authorization number be issued by Jeff Rowland Design Group prior to shipment.
Contents Ensure that all of the auxiliary components listed below are enclosed
within the accessory box. Refer to the diagrams illustrated above and verify the components included.
Remote sensor/display unit Handheld remote transmitter Remote sensor/display unit interconnect cable adapter (DB-25 male to RJ-11) Remote sensor/display unit interconnect cable Eight (8) compliant isolation interface supports Four (4) XLR/RCA adapters (one pair male input adapters and one pair female output adapters) AC power cable DC power cable One (1) warranty card (in some countries warranties are provided by the respective importer)
Initial Inspection / Contents
Front Panel Function Controls
CHARGE LOW FULL MODE SELECT BATT
Before attempting any system interconnection, please familiarize yourself with the front panel controls of the Coherence Preamplifier and Power Supply. The descriptions below refer to the numbers associated with the features in the diagram above. Any of the controls described below, when initiated, will be automatically stored in the microprocessor memory and will be recalled when the particular input is selected. For example, if Input 1 is selected and the gain is increased by 5dB with the Phase rocker switch activated, these settings are memorized and will be automatically recalled when returning to Input 1 after listening to other inputs. All functions are memorized with the exception of the volume control. However, if the Preamplifier is disconnected from the Power Supply, even momentarily, these memorized settings will be lost.
Front Panel A MODE SELECT push button: Momentarily pressing this button switches D GAIN rocker switch: Momentarily pressing the upper section
increases the gain of the selected Input by 0.5 dB to a limit of 20 dB higher than normal (0 dB) overall gain. For example, twelve (12) momentary presses will increase the gain by 6 dB. The GAIN lamp will momentarily illuminate each time the rocker switch is pressed.
GAIN rocker switch: Momentarily pressing the lower section decreases the gain of the selected Input by 0.5 dB to a limit of 20 dB lower than normal (0 dB) overall gain. For example, twelve (12) momentary presses will decrease the gain by 6 dB. The GAIN lamp will momentarily illuminate each time the rocker switch is pressed. INPUT TERM rocker switch: Momentarily pressing the upper section of the INPUT TERM rocker switch connects a 600 ohm terminating resistor across the inverting and non-inverting (positive and negative) contacts of the selected Input connector. The INPUT TERM lamp remains illuminated. Pressing the lower section of the INPUT TERM rocker switch disconnects the 600 ohm terminating resistor and the input impedance of the selected input reverts to 18,000 ohms. The INPUT TERM lamp is not illuminated. MONO rocker switch sums the Left and Right channel outputs into a monophonic signal output for the selected input. The MONO lamp remains illuminated. Pressing the lower section of the MONO rocker switch returns the selected Inputs Left and Right channel outputs to normal stereo operation. The MONO lamp is not illuminated.
the power supply between AC and BATT operational modes. Either the BATT lamp or the AC lamp will be illuminated. Note: BATT mode is not allowed unless the batteries have achieved sufficient charge capacity.
B LISTEN SELECT rocker switch: Momentarily pressing the upper section
enables INPUT/RECORD buttons 1-7 for listening via the preamplifier Main output jacks. LISTEN SELECT lamp will remain illuminated unless the lower section Record Select rocker switch is pressed.
C RECORD SELECT rocker switch: Momentarily pressing the lower
G MONO rocker switch: Momentarily pressing the upper section of the
section enables INPUT/RECORD buttons 1-7 for recording via the preamplifier Record output jacks. RECORD SELECT lamp will remain illuminated unless the upper section LISTEN SELECT rocker switch is pressed.
H PHASE rocker switch: Momentarily pressing the upper section of the
PHASE rocker switch inverts the absolute phase of both channels of the selected Input. The PHASE lamp remains illuminated. Pressing the lower section of the PHASE rocker switch restores normal polarity to both channels of the selected Input. The PHASE lamp is not illuminated. Function Controls continue on the next page.
Front Panel Function Controls, (cont.)
BYPASS rocker switch: Momentarily pressing the upper section of the BYPASS rocker switch enables the rear panel BYPASS inputs. The overall gain of the preamplifier remains fixed at 0 dB (unity) gain. All other preamplifier functions are disabled except for record functions. All previously selected front panel lamps are not illuminated with the exception of the BYPASS and selected RECORD input lamp. Pressing the lower section of the BYPASS rocker switch or selecting any other Listen input will restore normal operation. The previously selected LISTEN Input lamp is illuminated and the BYPASS lamp is not illuminated. MUTE rocker switch: Momentarily pressing the upper section of the MUTE rocker switch mutes the preamplifier outputs. The MUTE lamp illuminates. Pressing the lower section of the MUTE rocker switch restores the normal condition of the preamplifier outputs. The MUTE lamp is not illuminated. image is shifted to the left or right slightly for each press of the BAL L or BAL R button. Each press equals a total channel imbalance of 1 dB. For each 0.5 dB that one channel is offset, the opposite channel is offset in the opposite direction by 0.5 dB. This feature maintains that the absolute volume level will remain the same even though the image will be shifted by a specific amount. A total of six (6) presses on each button (3dB) can be achieved which will give a total imbalance of 6 dB between right and left channels. Either the L or R lamp will be illuminated to indicate a channel imbalance. Otherwise, neither L nor R lamp is illuminated.
CUT L/R push buttons: If the Mute lamp is illuminated, pressing the CUT L push button will mute the left channel only. The CUT L lamp illuminates. Conversely, if the Mute lamp is illuminated, pressing the CUT R push button will mute the right channel only and the CUT R lamp illuminates. To restore normal operation, press the lower section of the MUTE rocker switch. volume, while rotating the knob counterclockwise decreases volume. The VOLUME control provides a fixed range of 63.5 dB in increments of 0.5 dB throughout a rotation of 230 degrees. The 63.5 dB range remains constant, independent of the overall gain selected by the GAIN rocker switch mentioned above. The VOLUME control does not utilize mechanical end-stops to indicate minimum or maximum volume settings. The numerical position of the VOLUME control is indicated when the remote sensor/display unit is utilized.
M VOLUME control: Rotating the VOLUME control clockwise increases
K BAL L/R push buttons: If the MUTE lamp is not illuminated, the stereo
Preamplifier and Power Supply Rear Panels
D A D E B C
Preamplifier Rear Panel
A INPUTS 1-7 (Female XLR): Seven (7) XLR fully balanced or single-
Power Supply Rear Panel
ended inputs (via supplied XLR/RCA adapters) are provided for line level signals only. Each INPUT connector conforms to a Pin #1 ground, Pin #2 negative, Pin # 3 positive standard. Both positive and negative terminals of each INPUT connector are isolated from ground by several megohms which eliminates the possibility of ground loops and restores maximum common mode rejection ratio.
B BYPASS INPUT (Female XLR): Accepts balanced or single-ended inputs
RS232 DATA IN/OUT (DB-25 female connector): Provides power and signal data to the remote sensor/display unit. POWER SUPPLY OUTPUTS A & B (XLR female connectors): Parallel DC power and signal data outputs for preamplifier and optional companion units such as phono equalizer, etc. AC POWER INLET: Verify that the voltage indicated on the rear panel corresponds to the AC mains of your service area.
(via supplied XLR/RCA adapters) from home theater surround processor front left and front right outputs.
C MAIN OUTPUTS 1 & 2 (male XLR): Provides parallel XLR fully balanced
or single-ended outputs (via supplied XLR/RCA adapters). Each OUTPUT connector conforms to a Pin #1 ground, Pin #2 negative, Pin #3 positive standard. Both positive and negative terminals of each OUTPUT connector are isolated from ground by several megohms which eliminates the possibility of ground loops and restores maximum common mode rejection ratio. Balanced output signals are always provided regardless of input (single-ended or balanced) signal configuration.
D REC OUTPUTS 1 & 2 (male XLR): Provides parallel XLR fully balanced
or single-ended outputs (via supplied XLR/RCA adapters). Each OUTPUT connector conforms to a Pin #1 ground, Pin #2 negative, Pin #3 positive standard. REC OUTPUTS are ground referenced and buffered from any selected input. Balanced output signals are always provided regardless of input (single-ended or balanced) signal configuration.
POWER SUPPLY INPUT (male XLR): Interconnects the Preamplifier to the Power Supply via the supplied DC power cable. Caution: Use only the supplied DC power cable and companion Power Supply.
Installation and Operation
Installation and Operation The Preamplifier is normally installed directly on top of the companion
Power Supply. Be sure to install the supplied compliant isolation interface supports between each unit and underneath the Power Supply to avoid damage to chassis components and provide maximum mechanical isolation and decoupling from the supporting structure. First, connect the supplied DC Power Cable (1) between the Preamplifier and Power Supply, as illustrated above. Then connect the AC mains to the Power Supply using the supplied AC Power Cable. If desired, the Preamplifier can be located up to twenty (20) inches (one half (0.5) meter) above or below the power supply. The use of a longer DC power cable offering greater separation distance is not recommended. Upon initially connecting AC power, it may be necessary to press and hold down the MODE button (2) for five (5) seconds to initially boot-up or reset the charge management system located within the Power Supply. In a few seconds, the AC mode lamp will light and the Preamplifier INPUT 1 And RECORD 1 lamps will illuminate. The Coherence Preamplifier is designed to be powered from the AC mains which automatically initiates battery charging as necessary and is indicated by the illumination of the AC mode lamp. However, the Preamplifier is still powered by the internal batteries. AC mains power is disconnected from the power supply internally whenever the BATT mode is selected using the MODE push button. Under this operating condition, the preamplifier operates exclusively from the internal batteries. Up to fifteen (15) hours of operation in this mode is possible depending upon the initial state of charge of the internal batteries. If the Preamplifier is not used for an extended period of time and/or a source of AC power will not be available, AC power should be removed and the MODE push button should be pressed and held down for approximately five seconds. A slight click will be heard. No lamps should be illuminated. This feature allows the preamplifier to be stored or shipped without discharging the internal batteries. If the FULL charge lamp is illuminated, the battery capacity will range between 50-100% of full charge. This lamp will not illuminate shortly after the BATT mode is selected. If the LOW charge lamp is illuminated, the battery is significantly discharged and will automatically switch back to AC mode to commence charging. If AC mains power is not available under these conditions, then the Power Supply will automatically switch off, thus preventing the batteries from becoming overly discharged. The Power Supply is intended to operate connected to active AC mains at all times. The charge management system only permits operation at the voltage indicated on the rear panel. If an incorrect AC line voltage is used, all of the Power Supply front panel lamps will flash on and off simultaneously approximately four times per second. The Preamplifier is equipped with an internal pink noise generator. This noise is intended for cable, component and loudspeaker break-in. The noise generated is out of phase between left and right channels. A distinct acoustic null should become apparent at a midway point between the two speakers when utilizing this function. To initiate the internal pink noise generator, press the upper section of the MUTE rocker switch (3) and then the lower section of the BYPASS rocker switch (4). The Preamplifier will automatically route pink noise throughout the Preamplifier circuitry for break-in purposes. The volume control can be used to adjust the volume of pink noise at the output jacks as desired. To resume normal operation, simply select any LISTEN input (5). The Coherence Preamplifier utilizes circuit technologies which require a much longer break-in period than other preamplifier designs. It is recommended that a period of at least eight (8) days (200 hours) of continuous operation be allowed before full sonic performance potential can be expected.
Remote Control Features
A The six-function, hand-held, IR remote transmitter permits remote
operation of Input Selection, Volume Up/Down, Balance L/R and Mute functions
B A separate remote sensor/display unit simultaneously receives
transmitted data and displays the numerical Volume control position from 0 to 63.5 dB in increments of 0.5 dB.
C The supplied RJ-11 cable allows the remote sensor/display unit to be
placed within two meters of the preamplifier for optimal IR reception and/or volume control position viewing. Up to 30 meters of cable length can be used if desired.
D The Interconnect Cable Adapter should first be connected securely to
the DB-25 connector on the rear panel of the Power Supply using the integral finger screws. The RJ-11 cable can then be installed from the Remote Sensor/Display unit to the adapter. After installing the remote sensor/display unit and associated connecting cable, reset the preamplifier by pressing the power supply MODE switch and holding it for at least 5 seconds. Then release to commence operation. The remote transmitter handset operates on a standard 9 volt battery available from a wide variety of sources. This battery is accessed by removing the two Phillips head screws on the back side of the handset. Four (4) different data rate transmission codes can be selected if interference from other IR remote transmitters become an issue. Simply match the switch code between both handset and remote receiver/display unit internal switches (accessed by removing the respective bottom covers).
Coherence Performance Specifications
Power Supply Specifications
Power Consumption Mains Voltage
Adjustable for each input 20 dB relative to unity gain (0 dB) in 0.5 dB increments Adjustable for each input 18k or 600 ohms 18k or 600 ohms
40 watts maximum, 10 watts nominal 100V, 120V, 220V, 240V, 50/60 Hz 2 each 12 volt, 7.2 amp/hour user replaceable sealed, lead calcium, maintenance-free batteries 5-8 years
Maximum Input Level Maximum Output Level Output Noise Level
50 ohms 50 ohms 13 volts RMS at 0 dB gain 13 volts RMS (24 dBm) 12 microvolts 20-20 KHz bandwidth, 0 dB gain Greater than 96 dB Greater than 110 dB, @ 20-20 KHz bandwidth 5 Hz-160 KHz, -3 dB 0.0016% 10 volt output, 600 ohm load 63.5 dB, 127 equal increments 0.5 dB 0.03 dB over entire range 0.03 dB throughout entire range 17.5 in W x 12.0 in D x 3.7 in H 44.5 cm W x 30.9 cm D x 9.40 cm H 40 lbs (18 kg)
Battery Service Life
AC Unassisted Run Time 14-18 hours based upon
initial battery full charge
17.5 in W x 11.2 in D x 3.7 in H 44.5 cm W x 28.4 cm D x 9.40 cm H 43 lbs (19.5 kg)
Signal To Noise Ratio Channel Separation
Frequency Response THD + Noise Gain Range Gain Resolution Channel Balance Dimensions
Because Jeff Rowland Design Group is constantly analyzing new design improvements, we reserve the right to change or modify product specifications without notice or obligation.
If you have any additional questions regarding installation or operation, please contact your authorized Jeff Rowland Design Group Dealer.
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