JEFF ROWLAND CRITERION Operational Manual

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CRITERION STEREO PREAMPLIFIER

Operational Manual

REV14 2010

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Summary of CRITERION

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Important safety instructions the preamplifier has been designed to operate at the highest level of efficiency and performance in any normal operating situation; however, there are a few important use and care principles that must be kept in mind when operating the preamplifier: do not expose the pr...
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Note from jeff rowland design group elcome to the jeff rowland design group “family” and congratulations on your purchase of what is unquestionably one of the world’s finest preamplifiers. With its combination of features such as precision electronic circuitry, exceptional efficiency, and accurately...
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Table of contents ......................................................................................................... Special design features 5 ............................................................................................................ Maintenance and care 8 .....................
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Special design features machined aluminum chassis: the preamplifier circuitry is housed inside twin ultra-low resonance, structurally rigid chassis precision-machined from solid ingots of aircraft grade 6061-t6 aluminum, completely sealed for trouble-free operation, yield maximum electrical/emi/rf i...
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Shortest signal path: gain stages, based upon ultra-low noise differential balanced audio amplifiers, are implemented into the shortest signal path of any previous rowland preamplifier. All signal paths are balanced from input to output for maximum noise rejection. Dual-zone preamplification: separa...
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Handheld remote transmitter: highly ergonomic, custom handheld remote transmitter milled from aluminum billet supports complete system control and duplicates front panel operations. Remote sensor: wired remote sensor milled from aluminum billet enables handheld remote transmitter operation while hou...
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Maintenance and care all jrdg products are designed to provide a lifetime of enjoyment and listening pleasure. Chassis are sealed to prevent dust from entering the interior of the chassis and thus should never need interior cleaning during the lifetime of the product. All internal circuitry is maint...
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Unpacking and placement initial inspection inspect the shipping container for damage. If any portion of the shipping container, packing material, preamplifier, or accessories are damaged or missing, notify your dealer and the shipper (if a claim is to be made) immediately. Note: many shippers requir...
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Placement and alignment the audio chassis is always placed first on a stable platform, rack, or shelf. All audio interconnects can be inserted into the rear panel, at this time, while visibility is greatest. Then each multi-pin dc/data cable can be inserted into the rear panel receptacles. Simply pa...
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Front panel the front panel of the criterion preamplifier ’s control chassis features a vacuum- fluorescent (vfd) display, 10 push-buttons, and a multi-purpose volume/menu control knob, which can also be depressed and operates as an 11th push-button when pressed. All controls are precision machined ...
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5. Channel balance/offset indicator. The channel balance indicator is a horizontal bar graph located to the right of the phase indicator. The cursor changes from a small square to a diamond shape at the center of the bar graph when the left and right channels have identical gains, or when no input g...
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Control chassis controls figure 2: control chassis controls 1. Input buttons 1-6. The main input number is selected by pressing the desired input button. 2. Record pushbutton. Enters the record select mode. The record input number is selected by pressing the front panel’s record button and then pres...
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Menu options several buttons enter and exit the menu : the front-panel’s menu button; the handheld remote transmitter enter and exit buttons; and the front panel volume/enter knob. From the display’s main screen, pressing any of the menu buttons enters the menu mode. Once in menu mode, either the vo...
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Stop charging. Turns off the charging circuit, but continues to run on ac. This menu selection is optional, as charging is normally terminated automatically. Standby. Enters standby mode. Standby mode must be exited by pressing the front panel’s standby button. Record select. Assigns any input selec...
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Remote alt 1,2, and 3. Sets ir receiver frequencies to match handheld remote transmitter transmission frequencies when adjusted to corresponding transmitting frequencies. Display high/medium/low. Adjusts the brightness of the display in three levels. Display on. Cancels display off 5 s /15 s modes a...
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Rear panel control chassis figure 3: control chassis rear panel 1. Nimh rechargeable d-cell battery compartments. Contains six (6) industrial high current (9000ma) nickel metal hydride (nimh) rechargeable batteries accessible by rotating each cap one quarter turn counter-clockwise. 2. Integrated ac ...
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Audio chassis figure 4: audio chassis rear panel 1. Dc in r/l power input receptacles. Receptacles receive dc power and serial communications data via two supplied dc power cables, one for each channel, from the control chassis. 2. Inputs. Four (4) pair balanced (xlr), two (2) pair unbalanced (rca) ...
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Handheld remote transmitter the criterion preamplifier ’s infrared handheld remote transmitter is matched by a remote sensor unit that connects to the preamplifier’s control chassis via a 2 meter long cable. The hard wired connection allows the sensor unit to be placed up to 2 meters away from the p...
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Remote transmitter controls buttons 1 through 6. Selects the main input number. If front panel record button is pressed, or the record select menu option is selected, the handheld remote buttons #1 through #6 will select the record input number. Phase. Toggles between phase normal (l+ +r) and invert...
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Remote transmitter battery replacement criterion preamplifier ’s handheld remote transmitter is powered by 2 standard alkaline double-a (aa) batteries. When the remote transmission range decreases or no longer operates, the batteries need to be replaced. Using a standard flat blade screw driver, unf...
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General operations powering on and off the criterion preamplifier employs a master power switch on the rear panel of its control chassis. The rocker-type switch is integrated in the 15a female iec receptacle module, mounted in an inset area immediately to the left of the twin battery holders. When t...
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Note: balance adjustments made on any input will be applied to all inputs and is saved even when the preamplifier is powered down. Switching between ac mode and battery mode dc battery power mode operation can be selected either from the criterion preamplifier ’s front panel or from its handheld rem...
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Problems on associated electronic components, speakers, speaker wires, and interconnects, particularly in complex audio systems consisting of multiple amplifiers and multiple source components. Setting out 2 offset enter menu . Scroll and select out 2 offset . The balance indicator bar temporarily s...
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Battery mode and dc rechargeable batteries battery mode playing time the criterion preamplifier can operate in battery mode for 3 to 3.5 hours of playing time when batteries have been fully charged. When the battery charge is reduced to 12.5%, the preamplifier switches automatically to ac operation ...
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Specifications overall gain independently programmable 0 to 20 db on each input gain range 99.5 db, 199 equal increments gain resolution 0.5 db, +/- 0.03 db over entire range frequency response 10 hz – 300 khz, -3 db @ 8 ohms maximum input level 13.5 volts (rms) @ 0 db gain maximum output level 13.5...