Elminating line level noise
Ok well I basically have my setup finally figured out and running the way I want it to, I finally figured out how to wire the true 4.1 surround (in 5.1 mode)
First off I have a Creative Audigy SE soundcard. The front and rear channels are connected to a 4-channel amp directly via mini to rca splitter cable. No noise on these channels.
Previously, I was simply splitting the front channel and sending it to my monoblock amp for the bass, but this was a half assed temporary solution. It worked, but I couldn't adjust the bass from the computer.
The reason I did it this way temporarily is because the voltage coming out the bass channel is insanely low and the bass was barely audiable.
Today I went out and bought a single channel line driver which I hooked up to the bass channel. It works perfectly, it amplifies the signal, problem is it also amplifies the noise.
It's really bad, it's a constant loud rumbling noise from my sub, basically what you'de expect noise from a sub to sound like....
Anyway now that all the background and bs is done, the issue at hand is how can I elminate this noise? The computer is at most 3 feet away from the amp, and I have a 6 foot mini to rca splitter running to the line driver, and a 3 foot RCA out of the driver to amp. I'm pretty sure this is part of my problem, but I can't find any shorter cables. Can I just take a big chunk out of the middle of the RCA cables to shorten them and crimp them together, or will that only make more noise?
Basically, what can I do to reduce the noise, this is line level noise, not alt whine.
RE: Elminating line level noise - Thank you
Thanks for you post! I've been trying to find a solution to eliminate line in noise for too long. I have an Asus Xonar Essence XTS with two other computers going into its line in/microphone jack. The noise was always an annoyance requiring that I set the input jackís volume level down to 5% to reduce the noise, but then the problem was that my main computerís volume was much higher than the other two computers.
Once I replaced both standard computer stereo cables with ground loop isolator cables, my problem was solved. Now I have my line in volume set to 100% and all 3 computers have equal volume through my most powerful sound card. For anyone interested, I got the ground loop isolator cables at my local RadioShack for ~ $17.