US Blaster USB 3001 Owner's Manual page 4

USB 3001 - 3002 - 3003
Class-D Power amplifiers
4. GND
Chassis ground terminal. The chassis ground cable must be connected very tight on a nearby massi-
ve and electric conductive place.
5. Gain
Gain control regulates the sensitivity of the amplifier to match the signal output voltage of your sour-
ce unit. The gain control is not a volume adjustment. Use high quality CD music and increase the
volume of your source unit to 75%. Put the gain at the minimum and then slowly increase gain (cloc-
kwise). Stop at the first sign of distortion, then lower the gain a little (counter clockwise) to achieve
clear undistorted music at the maximum level.
6. Remote Bass Level Control ( Optional )
When using the remote bass level control you can adjust volume in the driver seat.
7. RCA audio-input
These RCA inputs connected with your radio preamp RCA outputs. Please use car audio RCA cables
otherwise they could be disturbed. Keep these cables as short as possible. To avoid disturbances from
your car electronics, please do not close the exsting car cables when you install the RCA cables. If
your radio has only one preamp output, please use a suitable Y-RCA adaptor. If your radio has only
one speaker output you must use a HIGH-LOW-LEVEL adaptor.
9. Bridge in
This RCA jack receives signal from the master amplifier when this amplifier is bridged as slave. DO
NOT use input jacks when the amplifier is working as slave.
All the functions will be adjusted by the master amplifier.
10. Bridge out
This RCA output sends out bridge signals to another same USB 3000-series amplifier in bridging con-
figuration.
11. Low Pass Filter
Filter out high frequency that the woofer can`t play. Adjust this knob to match the woofer`s freqen-
cy response.
12. SUBSONIC
Filter out unwanted too low frequency. This function will increase the power handing of your woofers.
It can adjust the frequency filter from 10Hz(OFF) to 50Hz.
13. Bassboost Frequency
Adjust the boosted center frequency. The frequency can be adjusted from 30Hz
to 80Hz, use combine with bassboost level adjusting.
14. Bassboost Level
Adjust the boosted frequency from 0~12dB, USB 3001`s boosted frequency is fixed at 55Hz, USB
3002 and USB 3003`s boosted frequency is adjustable.
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