I am trying to develop a touch screen jukebox as a front end for my 2CH setup. Bsaically its a HTPC using a M-Audio Audiophile 192 directly connected into my 2 tube monobloc amplifiers via RCA. I am trying to keep the chain as short as possible and was going to use the HTPC as a pre-amp.
I have run into a huge problem, the noise floor (static) is very noticable. I am assuming it has to due with the PC power supply but not 100% sure. I had an Antec Neo 500W so I went out an purchased a PC Power & Cooling 370W but that did very little to lower the noise floor (although it actually did do a little). I have tried the onboard audio as well but the noise floor is worse (to narrow down the problem source, so it isn't a sound card issue). The noise is there even when the PC is shutdown (I think because the mobo is getting 5V power still, because when I unplug the PC it dissappears). I have tried other sources connected in this manner and don't have any noise floor issue so I can defintely say its within the PC. I have tried different grades of power cables, RCA cables, connections etc and am at a loss. The las tthing to try is a Panamax Power conditioner is arriving today but that will only help upstream the PC and I think the issue is with EMI and the PC itself.
Another discrepancy is the M-audio RCA connections are set at 1.95Vrms and the input on the Amp's are set for .911V (911mV). Not sure if this would create as large of an issue as I am having since the CD player was modified to have a 1.25V output and doesnt have any noise floor issues with everyhting else the same.
The PC is a
Antec NSK2480
--Intel DG33TL
--Celeron 420
--2GB RAM
--M-Audio Audiophile 192
2 1TB Seagates in a RAID 1
Any ideas would be greatly appreciated.
I have run into a huge problem, the noise floor (static) is very noticable. I am assuming it has to due with the PC power supply but not 100% sure. I had an Antec Neo 500W so I went out an purchased a PC Power & Cooling 370W but that did very little to lower the noise floor (although it actually did do a little). I have tried the onboard audio as well but the noise floor is worse (to narrow down the problem source, so it isn't a sound card issue). The noise is there even when the PC is shutdown (I think because the mobo is getting 5V power still, because when I unplug the PC it dissappears). I have tried other sources connected in this manner and don't have any noise floor issue so I can defintely say its within the PC. I have tried different grades of power cables, RCA cables, connections etc and am at a loss. The las tthing to try is a Panamax Power conditioner is arriving today but that will only help upstream the PC and I think the issue is with EMI and the PC itself.
Another discrepancy is the M-audio RCA connections are set at 1.95Vrms and the input on the Amp's are set for .911V (911mV). Not sure if this would create as large of an issue as I am having since the CD player was modified to have a 1.25V output and doesnt have any noise floor issues with everyhting else the same.
The PC is a
Antec NSK2480
--Intel DG33TL
--Celeron 420
--2GB RAM
--M-Audio Audiophile 192
2 1TB Seagates in a RAID 1
Any ideas would be greatly appreciated.
