Fosi Audio TP-03, User Manual, Page: 11 / 16

6: Lack of Bass or Poor Imaging.
1). Check the polarity of the speaker wires on the amplifier and
both speakers.
2). Check the EQ or sound settings on your audio source.
3). Make sure the bass control on the amplifier has set up.
7: Low Volume.
1). Recheck the volume on your audio source and this amplifier is
turned up and not set to minimum volume.
2). Please make sure your audio source needs a pre-amp or not.
3). If you are using the turntable, please make sure that if your
turntable needs an phono preamp or not, some turntable built-in
phono preamp, some are not.
8: Hum Noise.
Adding a new component such as your BT10A amplifier can bring
out hum or buzz that may not have existed before. Your first
assumption may be that something is wrong with the component
but this is generally caused by a “ground-loop” in your system.
Consider these tips for possible solutions:
1). First, try moving all components to the same electrical circuit or
AC outlet.
2). If the hum or buzz is still present, power off all gear and remove
the mini-jack and/or RCA audio cables to and from the BT10A
amplifier.
3). Turn the TP-03 back on and check for hum. If the noise is still
audible try plugging the power supply power cable into a
different AC outlet.