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Here is the funny thing, I had the same problem with the JL 300/4 too, which has isolated inputs. That was mind boggling! I must had been picking up noise on the RCA cables, but from what? No idea. I was using (and still am) a good quality cable, with twisted pair, shield, braid, etc. Now it's...

Finally, problem solved!! What I did is tap into the headunit harness directly at the back of the headunit instead of under the seat where the Bose amp is located, move the amp to the trunk and ground it to the left metal bracket (pretty obvious when removing the tool trays). No need for a...

No. I don't even know where it is and how I would know if something is not right with it. Tips? Thanks for your input.

My MS3 08.5 GT has a mind of it's own when it comes to suspect noises/buzz/rattles. This week I am a getting a special rattle that I have never heard before. I am pretty sure it's not a suspension or sway bar induced noise. First I hear it when starting the engine, right when the engine ramps...

Do JL amps have built in GLI's too?

I have tried an Alpine PDX5 and an Infinity amp (can't remember which one, but it weighed a ton), and they both had the whine. I tried the PAC GLI and it sounded terrible. The Radioshack one sounded better, but I had to keep it away from metal surfaces. I gave up since and put the Bose crap...

What he said.

The MS3 is the most expensive car I have ever owned and it is the only one that clunks so bad.

So is it a normal thing or should I get it checked up?

I have a 2008.5 MS3 GT. When I cruise in 4th at ~2000rpm there is a weird growling sound, kinda like a gear growl sound. I also get it in 3rd or 5th at different rpms, but it's never as loud as in 4th at 2000rpm. Anybody else has a similar issue?

I would stay away from this solution because of the moisture that builds up in the doors. I have driven my car without the door trim panels when I was working on my setup, and holy cow there is a lot of water that gets down in inside the door when it rains. Car speakers are usually design to...

I personaly ran two pairs of wires through each door, one for the woofer, one for the tweeters, and my crossovers are under the seats (one on each side).

I bought a piece of 3/4" thick solid wood, and raised it to clear the plastic air vent. Then attached two 'L' shaped brackets on the sides to secure the plate to the two threaded bolts where the Bose woofer was attached. Then I bought a thin aluminum bar that I bent to the proper shape and...

The signals coming out of my HU (Bose system here) seem to be +4V above ground (+ to GND is 4V, so is - to GND). But since it's differential it doesn't really matter I guess.

I have tried a half dozen ground points, from battery neg to the engine to any piece of bare metal I could see and the same problem happened. My current ground location shows 0.1 ohm to where the battery is grounded. What ground location do you suggest??

I put two PAC ground loop isolators from Crutchfield - one for front left/right, one for rear left/right - and not only do they not entirely get rid of the noise (it's attenuated, granted), but they create a high pitch noise when close to the chassis' metal it seems. Although when I hung them in...

That's all well and good, but my Alpine PDX5 amp is [supposedly] compatible with balanced differential inputs. At least that's what the Alpine tech rep I talked to told me. I also checked with an ohmmeter, and the audio input neg is not tied to the ground reference.

Alright I am giving up and going the GLI way... I tried everything I could do, and I still get the whine. I found the ground point of the Bose amp by the way - sort of. I could trace the wire up to behind the glove box, in a funny looking plastic bulb, along with 5 other wires that just end up...

I basically bought a mating plug to the Bose amp connector, bought a 4 channel RCA cable, cut it to length and crimp terminated the wires with the right pins. Nice and clean. The RCA cable is then running against the cross member in front of the driver seat, goes up the center console by the...

I am curious, how close to the amp was your GLI?