Home Theatre w/Car Sub, RCA to Sound Bar, LOUD HUM

[JP_DAVENPORT]

I've thrown together a home theatre system. Starting out first with a tv, then sound bar, and deciding to go louder. Below is the current problem:

60" TV connected by Digital Coax to Vizio 2 channel Sound Bar. Sound bar connected to a Boss Amp which is powered by a 12v DC power converter, and connected to 1 12" sub.

specs:
-12v 30ª DC universal Regulated Switching Power Supply 360w
-Audiohahn AW1206T 12inch 2200w Dual 4-ohm Subwoofer
-Boss AR1500M 1500 Watt Mono Mosfet Amp
-8 gauge amp wiring
-Vizio SB3820-C6 38 inch 2.0 Channel Sound Bar
-HD 3.5mm AUX to RCA cable w/dual shielding gold plated high end metal shell

With Aux cable connected to SUB OUT on Sound Bar, only a loud hum comes from the subwoofer, no beats or anything from the audio that may playing. When a Ground Loop Isolator is added to aux cable from amp to sound bar, NO sound at all comes from Subwoofer.

Here's a Diagram of wiring:

wall outlet---->TV--->sound bar--(ground loop isolator)------->amp---->sub

wall outlet---->power converter----->amplifier

TV and sound bar are plugged into the same surge protector to a wall outlet

Power converter 3 prong is connected separately to a different surge protector at a different wall outlet.

 

[americanaudiophile]

Vizio manual suggests that the sub woofer output is all the way down by default. They say to press the BASS button on the remote and then use the prev/next buttons to raise the bass elvel half way up. Then connect and turn on the sub. Adjust volume from there. You may still need the ground loop isolator but a 3-2 AC ground lift might be needed too on the power supply. You might have three ground loops rather than two.

 

[JP_DAVENPORT]

Vizio manual suggests that the sub woofer output is all the way down by default. They say to press the BASS button on the remote and then use the prev/next buttons to raise the bass elvel half way up. Then connect and turn on the sub. Adjust volume from there. You may still need the ground loop isolator but a 3-2 AC ground lift might be needed too on the power supply. You might have three ground loops rather than two.

Thanks for the suggestion! Unfortunately I did try that and to no avail...I quickly plugged the aux into a device playing music and sound instantly went to the sub... I'm guessing that the sound bar is defective to some extent. I think my next move might be to get a receiver so the sub and sound bar can work from there instead of sound bar playing as the main hub.