Surge protection, no filtering, no regen please...

I think they will all have some effect on the overall sound. What you want is one that improves, not detracts.

HAve you tried plugging the amp straight into the wall, while using one of your conditioners for all other components?
HAve you tried separate isolated sources of AC for digital and analog?
Do you have 20a dedicated circuits in place?

I have amp plug into wall direct now and I don't have plan for dediciated line for now due to my house situation.

I'm just worried about lightning etc. so I want protection... but I want nothing more added to my system...

Hi! I always felt the same way you do. A change in sound is not necessarily an improvement. My only concern has been surge protection. Sudden transients in the power line are a reality. I have 20 amp dedicated lines for isloation and quietness. But for surges have used Brickwall filters from Price Wheeler Corp. I use 3 of the 20 amp: one each on the mono power amps and one on the transport and DAC. I have never had a problem in 20 years. They do not current limit current, they divert any noise to neutral, not to ground, and do not use sacrificial components such as cheap MOV's. They are also silent and inexpensive. Their website is very comprehensive and they sell direct. I hope this helps.

Hi, this may be what you are searching for
BlackNoise Energy Distributors

Looks well made, but, as usual, not clear on the method of surge protection which Chutt is mainly interested in. If MOV,s, no matter how costly and what implementation is used, they eventually fail, and you never know when! Also, looks overpriced compared to what I suggested above.