JEFF ROWLAND CORUS STEREO PREAMPLIFIER Operational Manual

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CORUS STEREO PREAMPLIFIER

Operational Manual

REV05 2010

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Summary of CORUS STEREO PREAMPLIFIER

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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: preamplifier circuitry housed inside single ultra- low resonance, structurally rigid chassis precision-machined from a solid ingot of aircraft grade 6061-t6 aluminum, completely sealed for trouble-free operation, yield maximum electrical/emi/rf isol...
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Equipped jrdg (jeff rowland design group) amplifiers a 140db dynamic range interface can be achieved. All unbalanced inputs convert to balanced upon entering the preamp. Flexible connectivity: 6 inputs (4 xlr balanced, 2 rca unbalanced); 4 main outputs (2 xlr balanced, 2 rca unbalanced); 2 record ou...
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The multi-function handheld remote transmitter. Rapid turns of the control knob adjust the volume by 1.5db increments. Slow turns of the control allow for very fine adjustments by 0.5db increments. Quiet power-up: no turn-on or turn-off transients during intermittent power interruptions. Customizati...
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Maintenance and care all jrdg (jeff rowland design group) products are designed to provide a lifetime of enjoyment and listening pleasure. Chassis is 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 ...
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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 place the corus preamplifier on a stable platform, rack, or shelf. The power supply can be placed up to two meters away from the preamplifier. All audio interconnects can be inserted into the rear panel at this time. Then each multi-pin dc cable can be inserted into the dc ou...
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Front panel the front panel of the corus preamplifier’s chassis features a vacuum-fluorescent (vfd) display, 10 push-buttons, and a multi-purpose volume/menu control knob. All controls are precision machined from aluminum billet. Each pushbutton has been designed with a slightly different length to ...
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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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Front panel controls figure 3: front panel 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 pressing th...
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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 knob. From the display’s main screen, pressing any of the menu buttons enters the menu mode. Once in menu mode, either the volume k...
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Out 2 offset. Adjusts the input gain offset of the unbalanced (rca) out 2 output relative to the balanced (xlr) main outputs 1 and 2 by turning the volume knob clockwise or counter-clockwise.The balance bar graph will indicate any degree of adjustment in 0.5db increments when this mode is selected. ...
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Rear panel figure 4: rear panel 1. Dc in r/l power input receptacles. Two separate dc power cables, one for each channel, are utilized to connect the power supply to corus preamplifier . 2. Inputs. Four (4) pair balanced (xlr), two (2) pair unbalanced (rca) input jacks for each channel. 3. Main 1/ma...
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Figure 5: handheld remote transmitter handheld remote transmitter the corus preamplifier ’s infrared handheld remote transmitter is matched by a remote sensor unit that connects to the preamplifier via a 2 meter long cable. The hard wired connection allows the sensor unit to be placed up to 2 meters...
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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 the corus 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 mute settings pressing the mute button once on either the control panel or remote transmitter reduces the main volume by 20db, and decreases the volume indicator by 20.0 counts. The display shows the volume indicator surrounded by corner brackets. Pressing mute button a second tim...
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Adjusting record out level enter menu . Scroll and select record out level . The main volume indicator shows the gain of the selected input routed to the record-out jacks. Adjust the level with the front panel’s volume knob or the remote’s rec out vol +/ − buttons. The record out level mode is also ...
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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...