No audio from a connected device

Be sure the device volume is turned up

Try a different audio device (i.e. instrument, microphone or playback device). If the other device works fine, the problem is with the device

A condenser microphone will not work if connected directly to the speaker. Instead, connect the condenser microphone to a suitable power source before connecting it to the speaker

If the audio device has multiple outputs—like a multi-output mixer—try a different output

Inputs 1 and 2 are mono

• To connect a stereo device, use a stereo-to-mono adapter. Otherwise, audio from one of the two stereo channels will not be heard
• If the device has pan controls, set them all the way to the "Left"

Try connecting the audio device with different cables

If available, connect the audio device to a different powered speaker to determine if the issue is with the device or speaker

Reboot the speaker by disconnecting its power cord for 30 seconds