FAQ
Parameters
and then rotate the knob to adjust it until the VU meter pointer in the
most suitable position. (When adjusting in "GAIN" mode, there will be
red backlight from the left VU meter, the pointer will indicate the
current GAIN range, and the mode will auto exit in 2 seconds.)
5. If you want to switch the color and brightness level of backlight, please
click the Mode Knob to"COLOR" or "LIGHT" mode, and then rotate the
knob to adjust them.
6. In any mode, long press Mode Knob for 3 seconds and all LED (color /
gain / light) will be turned off, then you can turn on or off the flowing
water light mode.
7. In flowing water light mode, the changing speed of flowing water light
also can be adjusted in COLOR mode. And the functions in GAIN and
LIGHT mode will not be changed.
Q: Why is there noise when the sound passes through VU22 preamp?
A: 1. Poor-quality USB power adapter with large ripple and big
interference, noise will be easily caused. Please change a better
USB power supply to have a try again.
2. VU22 needs to be powered by an independent USB power supply,
don't share a USB power supply with audio source, otherwise
common ground noise will be caused.
Q: The rear 3.5mm input is independent of the RCA input, can it be
switched?
A: Not supported. Stereo RCA and 3.5mm AUX input are in parallel, two
inputs and outputs will work simultaneously, so please don't connect
RCA and 3.5mm AUX input at the same time to avoid mixing.
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