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• If you make sure the power supply is defective, please contact
us for exchange.
4: Why does the sound is cracking or make a lot of
electric noise?
• Please make sure all the cables completely pushed into the
devices, incompletely connection will cause this cracking.
• Please remove all the inputs then check whether cracking noise
disappear or not, the cracking maybe from the audio source or
input cables.
• If you are not using the original factory standard power supply,
please replace the power supply before testing. Many power
supply in the market have large interference coefficient, which
will cause a lot of current sound.
5: Can I use headphone with this product?
• No, the BT10A cannot be connected to headphones and only
supports passive speakers.
6: How can I switch between Bluetooth input and AUX
input?
• You can connect this amp via Bluetooth as well as wired input.
But if Bluetooth connects, playback from the physical 3.5mm AUX
input is interrupted. You need to turn off the Bluetooth from your
device if you use AUX input when Bluetooth pairing.
Input priority: Bluetooth input > 3.5MM AUX input.
7: Why there is no voice from my amplifier?
• Please check whether the cable of power supply is connected to
BT10A and whether the power indicator is on.
3.5mm AUX for example
Prepare: audio source (take a phone as an example), a 3.5mm AUX
cable or a 3.5mm AUX to RCA cable (some devices will
need).
Step 1: Connect your phone to BT10A’s AUX interface via a 3.5mm
AUX cable;
Step 2: After connecting to BT10A, the indicator light shows red
light;
Step 3: Open the audio application, play and enjoy!
Troubleshooting/QA
1: What type of speakers work best with BT10A Amplifier?
• Fosi Audio Amplifiers work great with any 2-8 Ω passive
speakers. But please know that the amplifier is for passive
speakers, not for powered speakers and subwoofer.
2: Can I connect a turntable to BT10A amp, why is the
volume is extremely Low?
• As for the turntables do not have a built-in preamp, you need to
add an external phono preamp before connecting BT10A.
• As for the turntables which have a built-in preamp, you need to
switch the preamp on before connecting BT10A.
3: Why does my power indicator not light up?
• Please check that the AC power cord is securely connected to the
power supply and to an AC power outlet.
• Please check that the AC power outlet is supplying power, make
sure the power LED on the power supply will stay on.
• Please replace another power supply and try it again. 9-24V DC
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