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I have never had a problem with this. In fact, I make it a point to keep everything in the studio on a single 20-amp circuit. It eliminates any ground-loop problems and results in dead silence. I have analized the noise floor of my analog gear, including turning off all the desktop computers in the circuit and doing all the recording tests with a battery-operated device (Zoom 4n). There is no difference in the noise levels or spectrums when the computers are running. Also, no difference in the noise level or spectrum when recorded by battery operated device or with the PCI buss CardDeluxe in the PC's, or with the external Lynx HiLo. If PCs are causing noise on the line with professional audio equipment, there is a design flaw in the equipment or a wiring flaw in the power circuit. With audiophillic equipment, who knows. You'd think at those prices, they'd build in competent shielding and grounding! There's tons of information about proper shielding and grounding. Anyone who has any contact with the AES has access to much knowledge on this. There's no excuse for building noisy equipment today. All of that said, I have found that the old BSR home-control system and also any sort of interwebs on power lines usually will cause noise, particularly in high-sensitivty stuff like phono preamps. I make it a point to have no data or signals over 60hz riding on my inside power lines. Also, modern shielding and grounding was not as necessary in previous times, so some vintage equipment is very noisy in a modern home. Sometimes, making sure all the tubes are shielded and the shields are wired to a star-grounding system on the chasis can mitigate the noise. Lousy designs were always hidden RF receivers, and now there's more RF on more frequencies for them to pick up. -- Tom Fine ----- Original Message ----- From: "Carl Pultz" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, June 18, 2014 6:37 AM Subject: Re: [ARSCLIST] Upgrading Audio Systems > Yeah, like having a desktop computer system plugged into the same AC as your hifi. Move it to > another circuit. Providing the sound system with it's own AC line (or two) straight from the panel > can bring hidden vitality to even a modest hifi. Power matters. >> I suspect that, a lot of the time, mysterious differences in how something sounds turn out to be >> the result of out-of-band garbage making its way into the system, either via the signal cables or >> the wall. We live in an RFI jungle nowadays. >> >> One of the biggest improvements Greg Mackie ever made to the mic preamps in his mixers was a >> simple upgrade in their RF-proofing. >> >> Peace, >> Paul >> > >