Kennwood TS 2000 no sound on sub

Hitting the sub button I can see that the rig is receiving station but there is no Audio output, all can can here is the main and not the sub.

Any one know why I've lost audio on the sub?

 

I lost audio on one of the external ports one time. Back up your data and try a full reset on the radio.

 

Be sure the squelch is turned off (outer ring full counter clockwise), on that volume control.

 

Make sure your speaker outputs are set up right and connected to a speaker. There are several options to use in the menu as I remember.

 

Menu 16.