[mino922]

I have this strange whistle/hissing sound that I believe is coming from my Bit Ten and I am wondering how to fix it. The sound is only present after the Bit Ten has been on for a while, usually 30 or 45 minutes. It is also more present, when the volume on the DRC is higher. I have determined that it is the Bit Ten because when the HU is off and the Bit Ten is on, it is present. Also, I have swapped out my front stage amp and it is still present, so it does not seem to be coming from the amp.

Here is video to give you an idea of what I'm talking about.
IMG_0103_zpsfotwovt8.mp4 Video by mino922 | Photobucket

Thoughts?

 

[mino922]

Anyone?

 

[miniSQ]

i had a noise problem with my Bit Ten...but it was different than this. It was a very loud white noise that just started out of no where, and was not able to be turned down with the volume control.

So that would be one way to determine if it was the Bit Ten...does it incxreas and decrease when you adjust your HU volume control?

Does it happen when you run the BitTEN without the drc?

 

[mino922]

No. Only when i adjust the volume on the DRC.

 

[mino922]

I discovered yesterday that when I switch the input to AUX on the drc the whistle goes away. I believe I have narrowed it down to the signal from the factory HU. Any thoughts on how to fix this?

 

[Patrick Bateman]

The best solution is to improve the grounding.

One 'weird' solution is to increase the impedance of your speakers. For instance, I use a lot of high efficiency speakers, and due to their efficiency, they have a habit of increasing the SPL level of *everything*, including noise. So one weird way to knock down the noise level is to *lower* the efficiency of the tweeters with an L-Pad.

This wasn't some brilliant innovation of mine. Simply discovered it by accident. Due to this, I always use L-Pads on my tweeters, even tweeters with active xovers.

It's a complete waste of power, but I have power to burn. And it doesn't affect the power handling of the system, because the power isn't going into the voice coil, it's going into the resistor.

Of course, you have to use decent resistors, but a decent resistor is two bucks, so it's hardly an expensive solution.

 

[mino922]

hmm. It is grounded at a factory ground. The thing that really gets me is that when I switch the input on the DRC to AUX it goes away. To me that seems like an issue in the signal chain.

I need to spend a weekend on it...maybe when it is not so cold.