Loud hiss sound over bluetooth only? [CLOSED]

[datguy_dev]

Greetings,
I have a 1999' Ford Escort ZX2 with an aftermarket sound system. (Listed below) I went from a standard head unit to a wired tablet. Then I tried bluetooth from the tablet trying to get rid of the clutter. I don't need the tablet. But whenever I try to use bluetooth for the audio input, there is a constant "hiss" or noise sound that loudly plays over the speakers. (Example of the hiss) If I use an AUX cable, 3.5mm to RCA, there is no such sound. There is no engine whine or surging. Just a constant "shhhhhhhhhhhhhhhh!" At first, I called the sound "noise." So I've tried all the usual suggestions for reducing noise like ground loop isolators, cleaning all the grounds and the "big three." But they have had no effect, which is quite the bummer... I even tried stacking ground loop isolators! I have tried three bluetooth audio module/boards as of now with the same results. It kind of feels like the front amp is outputting like 200% volume. It doesn't play like 200%, but if you would turn up a home stereo's volume like that. It tends to have that sort of hiss.

The only thing I can't think to do at this point is to replace the speaker amplifier? I can't finely adjust the gain on it. It only has two position switch. If you have any other ideas or suggestions I am all ears? Thanks!

Speaker Amp: Clarion xc1410
Speakers: Component set. Crossovers and Tweeters are Soundstream. Front speakers are not Soundstream. I forget as it has been awhile. Kenwood KFC-C680 in the rear.
Sub Amp: Alpine MRV-M500
Sub: Alpine S-W10D2 10" (I believe)

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[Louisiana_CRX 5,000+ posts]

If your not getting the sound from your aux in it's not your amp. I'd have to think something in the bluetooth circuit of the radio is bad .

 

[Louisiana_CRX 5,000+ posts]

I just read you already tried 3 of these . But again it's not the amp . Because it's a clean signal from th he aux. Try a different bluetooth phone and see if it's there.. if it is then it may be vhf in the brand your using and I'd try another brand.

 

[datguy_dev]

I just read you already tried 3 of these . But again it's not the amp . Because it's a clean signal from th he aux. Try a different bluetooth phone and see if it's there.. if it is then it may be vhf in the brand your using and I'd try another brand.

The first BT module was designed for car audio use. It was called the iStream or iMusic something or other. The other two were DIY boards like you see in the video I posted. No difference between them when it comes to the hissing. But yeah, I have tried the tablet (Amazon Fire 7), my phone (Motorola x4), and a spare Google Nexus 5X. The issue isn't there.

I've tried so many small detail solutions like this over the years. This has been an issue for about 2 years or so. Eventually, I get pissed and avoid the issue for a bit until I stumble upon another idea. I want to go ahead and note my RCA splitting situation is quite crap. However, taking it down to one input and directly into the speaker amp doesn't help here.

 

[datguy_dev]

I'm going to consider this thread closed. I'm not going to chase the bluetooth dragon anymore.

 

[datguy_dev]

Update: No hiss using the USB powered BT module with 3.5mm output below. I was done trying BT, but I forgot I ordered it.