Parts Express 300-794 Quick Start Manual

250 Watt Subwoofer Amplifier
Thank you for purchasing the #300-794 Subwoofer
Amplifier. Ideal for building subwoofer projects for
audio and home theatre systems, this amp includes
both high and low level inputs, adjustable phase
control, volume control, auto on/off (activated by input
signal), and an electronic low pass filter that is con-
tinuously variable from 40 to 160 Hz. The amplifier
sums the right and left stereo inputs to a mono output,
so that only one amp is required per system. It also
features a 6dB high pass filter (125Hz, 8ohm) output
for satellite speakers. The amp has thermal, overload
and fuse protection for years of reliable use.
Crossover Frequency Control:
Adjustable Phase Control:
Power Switch (Auto On/Off):
Volume Control:
Line-in:
Line-out:
High-level In:
High-level Out:
Subwoofer Connection:
Rated Power Output:
Signal to Noise Ratio:
Dimensions:
Enclosure Cut-out:
Weight:
Voltage:
Controls
Continuously variable from 40Hz to 160Hz at 12dB/Octave
Continuously variable phase from 0° to 180°. This will aid in subwoofer room place-
ment. The correct position will be the one that provides the most apparent bass
output.
When the power switch is in the auto on position, the amplifier will automatically turn
on when a signal is present. Note: In auto on/off mode, the Power On LED is always
on, even when the amp is in rest mode (off).
Adjusts the output level of the amplifier.
Input/Outputs
These are line level RCA inputs. Use to connect pre-out or preamplifier outputs
directly to subwoofer amplifier's internal crossover. These inputs are summed to
mono. This is the preferred way to connect the subwoofer amplifier. If you have a
mono line level signal from a "ProLogic" or Digital Dolby "AC-3" receiver use the right
"red" input. If preamplifier outputs are not available, use the High-level inputs.
This line level RCA output provides a full range (20-20kHz) output and is used to
connect "daisy chain" the line level signal to other amplifiers. Note: Line out is only
active when a signal is present at the line-in input.
Speaker level input. Input connects directly to receiver via speaker cables.
Speaker level output. Used to connect satellite speakers. Note: Signal only present
when hi-level input is used. Features 6dB high pass circuit (125Hz @ 8ohm).
Connect the black lead to the negative (-) terminal of the speaker. Connect the red
lead to the positive (+) terminal of the speaker.
Specifications
150 Watts into 8 ohms at .1% THD
250 Watts into 4 ohms at .1% THD
101dB (A-weighted)
10-3/8"W x 10-7/16"H x 4-1/4"D
9"W x 9-1/4"H
12 lbs.
Switchable 115/230V, 50-60Hz, 450W
PARTS EXPRESS
725 Pleasant Valley Dr., Springboro, OH 45066-1158
PHONE: 937-743-3000 ◆ FAX: 937-743-1677
E-MAIL: sales@partsexpress.com