User manual JEFF ROWLAND SYNERGY

[. . . ] 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 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. E 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. 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. Pressing the lower section of the MONO rocker switch returns the selected Input's Left and Right channel outputs to normal stereo operation. PHASE rocker switch inverts the absolute phase of both channels of the selected Input. Pressing the lower section of the PHASE rocker switch restores normal polarity to both channels of the selected Input. Function Controls continue on the next page. F 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 Front Panel Function Controls, (cont. ) JEFF ROWLAND D E S I G N G R O U P S LISTEN SELECT GAIN Y INPUT TERM. N MONO E PHASE BYPASS R MUTE G Y L RECORD SELECT GAIN H I VOLUME J LISTEN RECORD 1 2 3 4 5 BAL L CUT R K Front Panel Function Controls, (cont. ) 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. I K CUT L/R push buttons: If the Mute lamp is illuminated, pressing the CUT L push button will mute the left channel only. 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. [. . . ] 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. 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. [. . . ]