Basic surge protection with some noise filtering without strangling the amplifier?

Hello @kirkwallace,  While   I use a Puritan 156+ power conditioner / surge protection for my digital equipment, I have always plugged my amps directly into dedicated 20amp outlets.  Your experience of throttling dynamics is consistent with many peoples findings, including my own, with many different power distributors, Not counting plain distributors with pure high quality outlets, but these offer no protection.  My digital is in my office, and at my stereo I also have a Shunyata Denali V2 which I use for my Streamer , DAC and Preamp.  I do hear an improvement with the Denali, but Amps are straight to the wall.  I'm good with this, no direct surge protection on the  amps, but understand the desire for protection.  My amps have had a surge or two and they immediately go into shut down (Audionet).  I also had the electric company instal a whole house surge protector, outside on my meter.  I've had some big thumps without that tripping so not sure if it really helps sensitive equipment or not, but I've also never had damage since it was in.  I think the digital / computer stuff needs protection more.

I would expect the Furman to limit dynamics, but you never know.  Go for it if it is returnable and give us a report!

The rule of thumb is always plug the amp into the wall without a power conditioner or anything else. 
 
My experience supports this. I have tried the "high Current" outputs on power conditioners as well as dedicated high current power conditioner designed only for an amp. They all had a very negative impact on the amp. 

Also, recommended, put your amp on a separate dedicated line from the rest of your equipment. This has a very positive impact. 

I concur with this excellent  advice...

The rule of thumb is always plug the amp into the wall without a power conditioner or anything else. 
 
My experience supports this. I have tried the "high Current" outputs on power conditioners as well as dedicated high current power conditioner designed only for an amp. They all had a very negative impact on the amp. 

Also, recommended, put your amp on a separate dedicated line from the rest of your equipment. This has a very positive impact. 

Any surge protector with series mode protection has excellent noise filtering built in, due to the nature of the protection.  Furman with LiFT adds linear noise filtering.

Regardless if what others say the "rule of thumb" is, I surge protect everything due to living in an area with continuous affronts to the electric grid.  Damage warranties are almost never enforceable and I don't want to go through the hassle of repair or replacing anything. 

Thank you all.

Although we don’t get much in the way of lightening here in the Pacific Northwest, I do worry a bit about power surges from other sources. I’m going to take Furman at their word about their “revolutionary Power Factor Technology, providing a surplus current reserve of over 45 amps (peak) that enables your amplifiers to operate at maximum efficiency.” That is a lot more than the 20amps coming out of the wall after all.  And as @fastfreight surmised, I will have 30 days to return them if they do strangle the amps.