LISTEN SELECT GAIN

INPUT TERM

PHASE BYPASS

RECORD SELECT

RECORD

BAL CUT
Synergy IIi Stereo Preamplifier Technology
The third generation of Synergy preamplifier from Jeff Rowland Design Group, the software-controlled Synergy IIi, features technology first conceptualized and created for the latest generation of amplifiers from JRDG. This circuit design incorporates changes to the basic implementation of the circuit itself and uses the latest in parts technology to improve upon the already capable Synergy II preamplifier. The input section of the Synergy IIi remains unchanged from the previous generation preamplifier and utilizes a pair of audio input transformers custom designed with the assistance of Jeff Rowland Design Group using the latest in computer aided drafting techniques (CAD). These transformers enable the input section to accomplish a number of unique goals, including insensitivity to unbalanced source impedances, high common-mode rejection extending to well beyond the audio bandwidth, immunity from RF contamination and system ground loops, and the same input impedance and gain regardless of whether the input signal is truly balanced or unbalanced. (For a more thorough description of transformer based inputs, please see the Jeff Rowland Design Group web site at: http://www.jeffrowland.com/techtalk.htm) Insensitive to unbalanced source impedances, the Synergy IIi has been designed to operate with the widest range of audio source components possible. Making the preamplifier immune to the effects of unbalanced source impedances means that in the real world where source components from different manufacturers will vary wildly in their design, a Jeff Rowland Design Group preamplifier will never be affected by these differences but will still provide the best possible sound quality from any CD player, surround processor, digital component, phono preamp, or analog source. In the world of audio specifications, common mode rejection is the ability of a balanced audio component to reject noise, EMI, RF, and other artifacts. A high common mode rejection ratio improves dynamic range as the music is produced from a quiet, silent background free of hiss, background noise, artifacts, and ground loop hum. Because of the unique abilities of its transformer-based input section, the Synergy IIi realizes superior common-mode rejection, letting the subtlest details, fastest transients, and most powerful dynamics present themselves with ease and clarity. With most amplifier designs, input impedance and gain will vary depending on whether the balanced or unbalanced inputs are used generally, unbalanced inputs will have half of the output of balanced inputs. With the Synergy IIi preamplifier, because all inputs are balanced and unbalanced sources can be adapted, there is no difference between balanced and unbalanced inputs, meaning that there will be no differing characteristic in sound quality and output level depending on which inputs are used both will provide the same seamless, neutral presentation. From the input section, the delicate audio signal is then handed to a control circuit that is protected and allowed to function in the best possible environment. This portion of the preamplifier section is microprocessor controlled and fully shielded from the rest of the preamplifier while also preventing any interference from this board from affecting the audio portion of the preamp. Within the diamond-cut faceplate of the Synergy IIi, a form-fitting pocket is machined to house the user interface board. Once the board is

in place, the faceplate is bolted to the main chassis to seal off the board from any noise or interference from the rest of the preamplifier circuitry. The volume control within the control circuit uses the most accurate and sonically neutral system available. A digitally controlled analog volume control is used to provide exact matching between both channels at every volume setting, as well as allowing the absolute simplest signal path possible. For each volume setting, the audio signal passes unscathed through only a single resistor. This unique system never suffers from the numerous problems found in conventional potentiometer controlled volume controls, including varying impedance and tracking accuracy, and avoids the issues associated with the use of DACs as volume controls, such as the distortions created by their internal polysilicon resistors. Inside the faceplate, the volume knob is attached to a laser-cut optical encoder wheel that is read by a light sensitive diode. This diode then sends the exact number of precise 0.5 dB steps to the volume control circuitry. The microprocessor within the unit then determines the knob rotation speed and raises or lowers the volume in either large or small increments for the most accurate and transparent volume control possible in the audio world today. The volume level is displayed by a green seven-segment LED display within the power supply that is easily read from the listening position. When not in use for more than 5 seconds, the volume control and display circuitry revert to a sleep mode to prevent any audible interference or distortion from corrupting the musical signal. This unique volume control circuit is also the source of the gain circuit as well. To maintain equal output levels between sources, a +/- 20 dB gain function has been added to the responsibilities of the volume control. This gain function will increase or decrease the level of each particular input so that the output level of each can be matched within 1 dB and prevent any differences in output level when switching from one input source to another. This gain circuit uses the exact same circuit as the volume control and is adjusted with a rocker switch on the front panel to prevent any change in the volume display. Because the gain circuit is the same circuit as the volume control, the audio signal is not affected by any adjustment in gain since it is actually the volume control, any gain adjustment is absolutely transparent and does not affect the sonic characteristics of the audio signal. The amplifier section of the Synergy IIi is contained on a small circuit board encased in the center of the main chassis of the preamplifier. This main chassis is machined from a solid block of aluminum and weighs approximately sixteen pounds. With the mass of the main chassis added to that of the faceplate, mechanical resonances outside the preamp have no chance to affect the audio signal sheltered within. The primary difference between the Synergy II and the Synergy IIi is this new amplifier board. Now designed using the latest in Surface Mount Technology, this board is the epitome of compact and efficient audio circuit design. In nearly every other high-end audio component available, there are hundreds of small components or parts with little wire leads on the internal circuit boards. These leads are bent and protrude through holes in the board where they're soldered into place to comprise the complete circuit. In a few notably poor designs, these parts are arrayed in perfectly aligned little rows for visual appeal instead of sonic quality or care for signal path routing. This is to ease assembly without regard for the known negative consequences of this type of design.

By making use of surface mounted parts, JRDG has ensured that there are no leads that go through the board unless absolutely necessary, as every little component has a small metal tip or "leg" that lies flat on the board and is soldered directly to a small pad instead of through a hole. In essence, parts are soldered directly to the surface of the circuit trace itself, rather than through it. This presents a number of improvements over traditional printed circuit board construction: Lead inductance from each parts wire lead is eliminated or substantially reduced to lower distortion. Since they have no leads and no lead connections, parts are much smaller and take up less space or geometry on the circuit board. Overall circuit geometry is substantially reduced, meaning that the amount of space that the circuit actually occupies on the board is much smaller, leading to less generated or radiated noise and a much lower susceptibility to noise. Signal paths are considerably shorter because of reduced circuit geometry, meaning there is much less opportunity for any negative effects to harm the audio signal. Because the number of obstructions or holes in the board that have been placed for various layers of circuit or connections have been reduced, the circuit can be laid out optimally for the best possible audio reproduction. Better planing (the planes or layers of the board that are responsible for different portions of the circuit) can be laid out and organized to minimize their interaction with each other. Stored energy within the circuit and on the board as a whole is reduced to limit and eliminate the effect it has on the operations of parts of the circuit and on the audio signal itself.
This new amplifier board also utilizes the best possible tolerances for each part as well as new op-amps within the circuit itself. These new parts allow the Synergy IIi to lower distortion substantially below that of the previous generations of the preamp and increase detail retrieval, dynamic capabilities, and musical realism well beyond that of earlier designs. This board is then suspended from each corner and floated on soft vibration damping mounts to prevent any remaining vibrations from affecting the work of the board in the tiniest way. With any outside effects eliminated in the input and amplifier section of the preamp, the final aspect of proper preamplification that remains is the output section. The output section of the Synergy IIi uses the same optimized buffer system as the input section in order to isolate itself from any interference or impedance issues outside of the preamp: custom designed audio transformers. These transformers are housed in holes cut into the main portion of the preamp and held in place with a unique damping material to eliminate vibrational effects and preserve the subtlest details in the audio signal. The remainder of the output section is contained on a printed circuit board that is attached firmly to the rear panel of the preamplifier and again bolted to the chassis for yet another lowering of the mechanical resonant point of the entire preamplifier. The design of the rear panel allows the Synergy IIi to connect with any existing source or amplifier, including surround processors via the bypass function, to produce the most favorable interface possible through the balanced inputs. Balanced

to unbalanced adaptors are also provided to allow the use of unbalanced equipment with no ill effects. The rear panel utilizes surface mount technology as well, and allows the use of the preamp to listen to one source while recording another, provide the action to load an input for optimum impedance matching, reverse phase or absolute polarity, mute the outputs, or listen to any source monaurally. This is all accomplished via a system of microprocessor control that allows the control section, input section, output section, and power supply to speak to each other in order for each portion of the preamp to function as if it were a whole unit designed onto one large circuit board. An external power supply completes the electronic design of the preamplifier; with the volume display housed in a slim, monolithic power supply chassis. The power supply features dual power out connectors to allow the use of the matching Cadence Phono Preamplifier in tandem with the Synergy IIi. This power supply uses a compact linear supply with power output capabilities more than adequate to supply both units at one time. This supply is encased in a housing that is again machined out of a solid block of aircraft grade aluminum to reduce any outside interference as well as shield the preamplifier section from any noise generated by the supply itself. The separate power supply is connected to the preamp by a flexible, custom manufactured umbilical cable that carries power as well as the microprocessor controlled volume display data. The exterior shape of the preamplifier has been artistically designed with rounded corners and no sharp edges. The entire assembled chassis is finely constructed from pieces of solid aluminum, each cut to a specific depth and thickness determined by Golden Ratio mathematical proportions that, when bolted together, prevents any unwanted mechanical vibrations or resonances from reaching the audio signal within the unit. The exposed front surfaces of the preamplifier and power supply faceplates are each carefully machined in a unique process that uses a diamond tipped blade. This distinctive process was refined over many years to produce an artistic and attractive appearance which has been copied a number of times but never equaled. The raw faceplate metal is then finished with fine automobile polyurethane clear coat to preserve the clarity of the cut surface and allow the brilliant radiance of the diamond-cut process to shine. Every edge of the chassis is sealed with overlapping joints to prevent dust from entering the chassis; therefore the interior should never need cleaning over the lifetime of the product. The Jeff Rowland Design Group Synergy IIi strives to attain the goal of completely removing any editorial comment on the audio signal that it passes from input to output. The final result is cleaner, clearer, faster, more musical and realistic sound reproduction from a smaller, more energy efficient preamplifier.

Synergy IIi Specifications
Overall Gain: Input impedance: Balanced Unbalanced Output Impedance: Balanced Unbalanced Maximum Input Level: Output Noise Level: Signal to Noise Ratio: Channel Separation: Frequency Response: THD + Noise: Gain Range: Gain Resolution: Channel Balance: Power Consumption: Preamp Weight: Power Supply Weight: Preamp Dimensions: Power Supply Dimensions: Adjustable for each input, 20 dB relative to unity gain (0 dB) in 0.5 dB increments. Adjustable for each input. 36k or 600 ohms 36k or 600 ohms 40 ohms 80 ohms 13 volts RMS at 0 dB gain. 10 microvolts, 20-20 kHz bandwidth, 0 dB gain. Greater than 96 dB. Greater than bandwidth. 100 dB, @ 20-20 kHz
5 Hz - 160 kHz, -3 dB. 0.0012%; 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. 25 watts maximum. 24 lbs./11 kg. 7 lbs./3 kg. 17.5 (w) x 14.35 (d) x 5.75 (h)/ 44.5 cm (w) x 36.2 cm (d) x 14.6 cm (h). 17.5 (w) x 4.8 (d) x 1.5 (h)/ 44.5cm (w) x 12.2cm (d) x 3.8 cm (h).

JEFF ROWLAND

D E S I G N G R O U P
Synergy 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 Synergy 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 S and the Power Supply serial Please include these numbers with any correspondence regarding your Coherence
number begins with the letter R. 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

Product Features
Five balanced XLR inputs per channel. Balanced XLR main and record outputs. 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. Six-function hand-held IR remote control with IR sensor/display unit located in companion power supply for volume level indication. Chassis and all chassis components precision machined from 6061 aluminum plate provide maximum mechanical resonance control. All operational functions 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 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 an isolated, stable, low noise DC power source with integrated IR receiver circuitry and display for indicating volume level. Two separate power supply outputs for powering additional companion units such as an optional phono equalizer. Chassis and all chassis components precision machined from 6061 aluminum plate provide maximum mechanical resonance control.
Introduction / Product Features

Contents

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 Synergy 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.
Handheld remote transmitter One (1) warranty card (in some countries warranties are provided by the respective importer) Four (4) XLR/RCA adapters (one pair male input adapters and one pair female output adapters) AC power cable Eight (8) compliant isolation interface supports DC power cable
Initial Inspection / Contents
Front Panel Function Controls

GAIN INPUT TERM.

PHASE BYPASS

LISTEN SELECT

RECORD SELECT

VOLUME

LISTEN RECORD
Before attempting any system interconnection, please familiarize yourself with the front panel controls of the Synergy 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 inputs can have their own unique settings which will be recalled automatically when returning to the respective input. 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 LISTEN SELECT rocker switch: Momentarily pressing the upper section D 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 36,000 ohms. The INPUT TERM lamp is not illuminated. MONO rocker switch: Momentarily pressing the upper section of the 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. 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.
enables INPUT/RECORD buttons 1-5 for listening via the preamplifier Main output jacks. LISTEN SELECT lamp will remain illuminated unless the lower section Record Select rocker switch is pressed.
B RECORD SELECT rocker switch: Momentarily pressing the lower
G PHASE rocker switch: Momentarily pressing the upper section of the
section enables INPUT/RECORD buttons 1-5 for recording via the preamplifier Record output jacks. RECORD SELECT lamp will remain illuminated unless the upper section LISTEN SELECT rocker switch is pressed.
C 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.

Front Panel Function Controls, (cont.)

LISTEN SELECT GAIN

INPUT TERM.

RECORD SELECT GAIN

H 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.
K 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.
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 ouputs. The MUTE lamp is not illuminated. BAL L/R push buttons: If the MUTE lamp is not illuminated, the stereo 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.
VOLUME control: Rotating the VOLUME control clockwise increases 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 on the power supply.

Preamplifier and Power Supply Rear Panels

B D E D B

Preamplifier Rear Panel
A INPUTS 1-5 (Female XLR): Five (5) 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
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 OUTPUT (male XLR): Provides XLR fully balanced or single-
ended outputs (via supplied XLR/RCA adapters). OUTPUT connector conforms to a Pin #1 ground, Pin #2 negative, Pin #3 positive standard. Balanced output signals are always provided regardless of input (singleended or balanced) signal configuration.
D REC OUTPUT (male XLR): Provides XLR fully balanced or single-ended
outputs (via supplied XLR/RCA adapters). OUTPUT connector conforms to a Pin #1 ground, Pin #2 negative, Pin #3 positive standard. REC OUTPUT is 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 Power Supply is normally installed directly on top of the companion

Preamplifier. Be sure to install the supplied compliant isolation interface supports between each unit and underneath the Preamplifier 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. The Power Supply is intended to operate connected to active AC mains at all times. In the event of a short or long term loss of AC power, the preamplifier outputs will automatically mute. When full AC power is restored, all previously programmed settings will be lost and the volume control will reset to 0. 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 The Synergy Power Supply simultaneously receives transmitted data
and displays a numerical Volume control position from 0 to 63.5 dB in increments of 0.5 dB. 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. Please contact your Jeff Rowland Design Group dealer or distributor for information on selecting different data codes.
Synergy Performance Specifications

Overall Gain

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 36k or 600 ohms 36k or 600 ohms
25 watts maximum 100V, 120V, 220V, 240V, 50/60 Hz 17.5 in W x 4.8 in D x 1.5 in H 44.5 cm W x 12.2 cm D x 3.8 cm H 7 lbs (3 kg)

Input Impedance

Unbalanced Balanced

Output Impedance

Dimensions

Weight

Maximum Input Level Maximum Output Level Output Noise Level
40 ohms 80 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 100 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 6.0 in D x 3.15 in H 44.5 cm W x 15.25 cm D x 8.0 cm H 24 lbs (11 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.