I bought an aluminum case for my Topaz Isolation Transformer and put some Faraday Fabric around it, and I immediately feel better. Purchasing Info. 2 foot pigtail plug, grounded CNE-5666-C Plug (NEMA 6-15). 0.0005 pF isolation. Here's an MGE brochure that covers the specs and gives the model numbers for all of the 0.0005pF  transformers (ending in -31 or -32):Let me tell you, it's easy to hear a difference between -60 dB of high-frequency noise reduction and -146 dB.I have thought about buying a Topaz ultra isolator transformer, but found them a bit too expensive (> $500) for just an experiment. I especulate if it could be the side effects that come combined with magnetic and electrical fields like ultrasonic noise or something else, but not them directly. If you were only going to buy one isolation transformer, get a low-capacitance Topaz Ultra-Isolator, selecting one that supplies at least twice the VA (volt-amperes) as the total of all of the loads you intend to power.

DIY is much cheaper though.

Small ones don't seem to bother me though.Hi shyamwanne, very interesting observation.

Would you feel sick also when passing beneath high power transmission lines? If that receptacle is housed in a metal box, then that metal box needs to grounded by NOT using the ISO Transformer ground.If you are thinking of the orange receptacles, they are used in a balanced regime, with a whole lot of other rules to comply with.I don't see any  reason why an isolated ground system would benefit less from an isolation transformer (balanced or not) than a regular ground system..To be extra clear,  should the ground cable of the input and output cables be connected to the chassis ground screw (the chassis ground on both sides being connected together in the model I have, a Daitron,  with a cable that goes through the transformer)?I just purchased a Topaz 91002-32 Line Noise suppressing Ultra-Isolator for $200, USED - GOOD CONDITION, but i looked and looked and looked until  i found some other places where they got theses gems by one unit or so, this unit sells for $1,250 in,So you can find a really good unit for much less.That is about what I paid from my 91002-32. So the (-20dB) common mode noise rejection of the balanced power might be (much) more important and more audible than any (-140dB) common mode noise mains filtering by the transformer..I think most common mode noise in my system  is caused by leakage currents from the active audio components' power supplies.This is dead right. Get out the soldering iron.One of the two outlets refused to accept the full length of any three-prong plug because something was broken off inside that receptacle that could not be extracted and replacement required de-riveting (drilling out) two, threaded spring clips from the old outlet, salvaged for mounting the new outlet to the cover plate.The 3-prong plug was missing from the supply cable.The fuse holder had the metal remains of a glass-bodied fuse jammed into the bottom of it, preventing insertion of a new fuse (even though the overall length of the new fuse holder is identical to the old and the new cap fits the old holder perfectly, without a fuse).One of the two outlets refused to accept the full length of any three-prong plug and replacement of the outlet required de-riveting (drilling out) two, threaded spring clips from the old outlet, salvaged for mounting the new outlet to the cover plate. Well, I think an update is in order here. The Topaz 0.0005pF isolation transformer does a much better job of common-mode noise reduction in the higher frequencies, than does a Tripp-Lite is500 isolation transformer, with which I had been perfectly content, for over a year. The Tripp-Lite made an obvious reduction in the noise floor, with or without the noise-generating dimmer switch - but it just can't compete with the Topaz 0.0005 pF performance.I wish I had heeded Jon Swenson's very similar words on this subject, a long time ago, but I was too proud of my Tripp-Lite setup to acknowledge that something better could be out there waiting for me.The Tripp-Lite transformers only claim a 1000:1 to reduction in common-mode noise (-60 dB), where the Topaz model numbers ending in,Let me tell you, it's easy to hear a difference between -60 dB of high-frequency noise reduction and -146 dB. Used, very clean. [4] How about a way to remove any DC offset that might be coming in from the mains?hi gregorio I see from your profile you do a l a lot of pro audio stuff.

Topaz Line 1 Power Conditioner 2000VA Model 52993-0003.