Specifications, Parallel Mono Operation

3.Connect the loudspeakers to the Channel 1 and Channel 2 SPEAKER OUTPUTS (5,7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4 OHMS PER CHANNEL. If you try to operate at a lower impedance, the amplifier will go into protection mode and stop operation until you correct the load conditions.

4.With the LEVEL CONTROLS (12,15) of both channels set to zero (fully counterclockwise), turn the POWER SWITCH (9) on. Apply a signal to the input of the amplifier. The level of the input signal should be as high as you will ever need it to be. This way, it will be as high above the amplifier’s noise floor as possible, ensuring an excellent performance and signal to noise ratio. Adjust the LEVEL CONTROLS (12,15) for each channel to achieve the desired maximum listening level. Note, when the CLIP LED (14) light, there is distortion present in the amplifier’s output section. If a CLIP LED (14) remains on or flashes repeatedly, reduce the signal level by lowering the input level control for the channel that is clipping or reduce the level at the source.

PARALLEL MONO OPERATION:

Follow these instructions for Parallel Mono Operation using a single input cable, and you will have the same monophonic signal on both the Channel 1 and the Channel 2 outputs. Each channel’s output is controlled independently by that channel’s level control.

1.With the power off, set the OPERATION MODE SWITCH (3) to the Parallel Mono position.

2.With the power off, connect your input cables to the Channel 1 input only using the 1/ 4" INPUT JACK (1) of Channel 1.

3.Connect the loudspeakers to the Channel 1 and Channel 2 SPEAKER OUTPUTS (5, 7). THE TOTAL SPEAKER LOAD MUST BE AT LEAST 4 OHMS PER CHANNEL. If you try to operate at less than 4 Ohms per channel, the amplifier will go into the protection mode and stop operation until you correct the load conditions.

4.With the LEVEL CONTROLS (12,15) set to zero (fully counterclockwise), switch the POWER (9) on. Apply a signal to the input. The level of the input signal should be as high as you will ever need it to be. This way, it will be as high above the amplifier’s noise floor as possible, ensuring an excellent performance and signal to noise ratio. Adjust the LEVEL CONTROLS (12,15) for each channel to achieve the desired maximum listening level. Note, when the CLIP LED (14) light, there is distortion present in the amplifier’s output section. If a CLIP LED (14) remains on or flashes repeatedly, reduce the signal level by lowering the input level control for the channel that is clipping or reduce the level at the source.

MONO BRIDGE OPERATION:

Follow these instructions to bridge the unit’s output. Bridging the amplifier converts the unit to a monophonic or single channel amplifier . The amplifier can be used with 8 Ohm or higher loads only in Mono Bridge mode. This mode is used to provide a higher voltage with greater headroom to your speaker. Before setting your amplifier for Mono Bridge operation, make sure that your speaker can handle the high power level provided by the amplifier in Mono Bridge mode.

CAUTION: VOLTAGE OVER 100 VOLTS MAY BE PRODUCED AT THE BRIDGE OUTPUT TERMINALS IN THIS MODE.

1.With the power off, set the OPERATION MODE SWITCH (3) to the BRIDGE position.

2.With the power off, connect your input cables to Channel 1 input only using the 1/4" INPUT JACK (1) of channel 1.

3.Connect the loudspeaker to the BRIDGE SPEAKER OUTPUT (6) only. Be sure the polarity of your connection is correct. The total speaker load must be at least 8 Ohms or above. If you try to operate at less than 8 Ohms in the Mono Bridge mode, the amplifier will go into the protection mode and stop operation until you correct the load conditions.

4.With the Channel 1 LEVEL CONTROL (15) set to zero (fully counterclockwise), switch the power on. Apply a signal to the input. The level of the input signal should be as high as you will ever need it to be. This way, it will be as high above the amplifier’s noise floor as possible, ensuring an excellent performance and signal to noise ratio. Adjust the LEVEL CONTROL (15) for Channel 1 to achieve the desired maximum listening level. Note, when the CLIP LED (14) light, there is distortion present in the amplifier’s output section. If a CLIP LED (14) remains on or flashes repeatedly, reduce the signal level by lowering the input level control for Channel 1 or reduce the level at the source. During Mono Bridge operation, the Channel 2 level is inactive, however, both channels’ LED will flash simultaneously and show output conditions.

USING THE GROUND LIFT SWITCH:

Depending on your system configuration, sometimes applying the ground will create a quieter signal path. Sometimes lifting the ground can eliminate ground loops and hum to create a quieter signal path.

1.With the power amp on, listen to the system in idle mode (no signal present) with the ground applied (the GROUND LIFT SWITCH (4) in the left position).

2.Turn the power off before moving the GROUND LIFT SWITCH (4). Lift the ground by moving the GROUND LIFT SWITCH (4) to the right, turn the power back on and listen to determine which position will provide a signal free of background noise and hum. Keep the GROUND LIFT SWITCH (4) in the ground position if the noise level remains the same in either position.

CAUTION: DO NOT TERMINATE THE AC GROUND ON THE POWER AMPLIFIER IN ANY WAY. TERMINATION OF THE AC GROUND CAN BE HAZARDOUS.

SPECIFICATIONS:

	X1		X2	X3	X4
Output Power EIA:				1kHz @ 1% THD, Wrms
Both Channels Driven 8Ω	85		140	200	200
Both Channels Driven 4Ω	110		200	300	300
Mono Bridge 8Ω	220		400	600	600
Dynamic Headroom, dB:
At8Ω	1.4		1.5	1.6	1.6
At4Ω	1.9		2.0	2.2	2.2
Frequency Response					30 Hz - 50 kHz
Total Harmonic Distortion		Iess than 0.05%, typical 0.02% @ 1 kHz
Signal to Noise ratio			100 dB below rated power @ 8Ω
Damping factor				greater than 200 @ 8Ω
Slew rate					20 V/µS
Voltage gain, dB	28		30	32	32
Input Sensitivity (for rated power at 8Ω )					1 Vrms
Input Impedance Unbalanced					10 kΩ
Input Impedance Balanced					20 kΩ
Power consumption, W	500		800	1200	1200
(at rated power at 4Ω , both channels driven)
AC Power Requirements		110-120 V / 60 Hz and 220-240 V / 50 Hz
Indicators:					1 Power LED
...............................................................................................					1 Protect LED
..................................................	1 Signal LED per Channel (for X1, X2, X3)
.................................................................			1VU-meter per Channel (for X4)
Cooling			Fan, Front-to-Rear Forced Air
Protection:			Short Circuit, DC, Thermal Cut-off,
...............................................................			Sub/Ultrasonic Frequency Filters,
.......................................Turn-on Delay, Main Fuse, Secondary DC Fuses
Connectors:
Balanced/Unbalanced lnputs					1/4" Jack
Speaker Outputs				5-way Binding Posts
Dimensions:
X1, X2, X3	19"W x 10.75"D x 3.5"H (483 x 273 x 89 mm)
X4	19"W x 10.75"D x 5.25"H (483 x 273 x 133 mm)
Weight	16.3 Ibs		17.8 Ibs	20.2 Ibs	21.6 Ibs
	7.4 kg		8.1 kg	9.2 kg	9.8 kg

SPECIFICATIONS AND DESIGN ARE SUBJECT TO CHANGE WITHOUT NOTICE FOR PURPOSE

OF IMPROVEMENT

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X1, X2, X4, X3 specifications

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PARALLEL MONO OPERATION:

MONO BRIDGE OPERATION:

USING THE GROUND LIFT SWITCH:

SPECIFICATIONS:

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500

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1200

X1, X2, X4, X3 specifications