US Blaster USB 1389 Manual Del Usuario página 4

USB 1389 - 1390 - 1391 - 1392
Class-AB Power amplifiers
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. 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.
7. CROSSOVER SELECTOR
The switch and knob control the low-pass filter, high-pass filter and full-pass function. When set to
LPF or HPF, the cut-off frequency can be adjusted by the frequency knob.
8. RCA Audio Output
These RCA outputs connect with other amplifier inputs. This buffered output signal is easy to use for
daisy-link amplifiers.
9. RUN LED
It will light up when the amplifier is switched on. It will shut down when there is a malfunction.
10. ALARM LED
Indicates if the amplifier is in self-checking or malfunction.
11. 4CH/2CH switch
This switch can adjust 2-channel / 4-channel input function, when at 4ch position, the amplifier works
as 4-channel separate input. When at 2ch position, CH-B input will be paralleled to CH-A, CH-B input
jack will be the dummy at same time.
© US Blaster Europe BV