Terrible static noise on SP13000 (internal audio)
Finally got my carpc put together and thought I'd give the built-in internal audio a try first. What a disaster. I took all the precautions, such as: Keeping the power cables seperated from the signal wires, and using a common ground for the carpc and amp and also minimizing the length of the wires.
I could live with a little noise, but this is huge! Whenever the hard drive is accessed, I can hear extra noise. If I run the GPS software, the data transmitted in bursts from the GPS unit can be heard. And I also get alternator noise too. :(
1) Unplugging the RCA cables off from the amp and everything is silent and not even a hint of noise. This suggests that I don't have a ground looping problem.
2) Unplugged the stereo mini jacks from the back of the SP13000 motherboard and everything is quiet (as expected). I took out my trusty notebook and inserted one of the stereo mini jacks into it and the sound is perfect. No Hard drive noise, GPS noise, or alternator noise.
Since I reused the same RCA signal wire from the SP13000 and notebook, this rules out a signaling cabling problem.
The notebook is powered by its battery and is essentially ground isolated, so that could be another reason why it sounds better.
If I were to purchase an Audigy 2 NX would this solve my problem? I already wasted money on a preamp hoping it would solve the noise problem but it didn't.