I represent ASA Electronics, the producer of the JENSEN brand of televisions, stereos, and speakers, Voyager brand of observation monitors and cameras and the Advent brand of appliances. At ASA, we strive to provide excellent customer service and product satisfaction and would like to offer some assistance in this matter.
The suggestions mentioned here are correct. First, verify that the red LED on the control panel of the sub is ON when the stereo is ON. If ON, verify your Gain is turned up to at least halfway. If the LED is OFF, check the fuse (in-line 10A on the Yellow wire). If the fuse is good, proceed to check both the Yellow and Blue wires for +12V DC using your multi-meter. Verify your Ground on the Black wire. If the LED lights up and the voltage is good but you are still not getting any sound, next step would be to verify the sub output on the stereo is active, then verify your audio cables are connected between the stereo and the sub. You can plug another audio source (DVD/MP3 player for example) into the subwoofer’s input and if you get sound from that, this would indicate the problem is in your source. If the LED is OFF and wiring/voltage is good, then it would appear the issue is in the sub. Contact your coach dealer for warranty on this, if needed.
Please feel free to call our Technical Services department at 877-845-8450 M-F, 8:00AM till 6:00PM EDT if you have any questions.
Let me know if you need any further assistance.
ASA Electronics - Producer of JENSEN RV TV's, stereos & speakers; Voyager Observation Systems & Advent appliances.