1. Why is there no sound after all the devices are connected?

•The amplifier is not powered on, please check whether the mode indicator is on;

•The volume of the amplifier is too small, please turn the volume knob clockwise and adjust it to the right level;

•The audio cable is connected incorrectly, please reconnect it according to the steps in the instruction manual;

•The audio source is not playing or muted, please check the audio source equipment.

2. After a successful connection, the sound is abnormal?

•Polarity reversed. Please check if the speaker wires are correctly connected with the red as positive and black as negative;

•Poor speaker wire contact. Reconnect or replace the speaker wire. For RCA/XLR cables, reestablish the connections or try using different RCA/XLR cables;

•Amplifier overload. Reduce the volume if the amplifier is experiencing overload.

3. Unable to play properly after connecting the turntable?

•The turntable lacks a built-in preamp: Please check if your turntable has a built-in preamp. The ZA3 does not have a built-in turntable preamp, so you need to connect an external turntable preamp between your turntable and the ZA3. For example, Fosi Audio Box X1, X2, X4, etc.

•Incorrect turntable output mode: Turntables with built-in preamps typically offer both turntable output and line output options. Please select the line output.

If you have any further questions, please contact our support team via support@fosiaudio.com