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

@kirkwallace  - I own the Elite PF-15i and I've several times noticed it when it was absent that my stereo did not sound as transparent or clean.  When I was in San Francisco I enhanced it by adding an AR unit after I measured 130V at the wall. 

The power factor correction and trigger outlets were really useful for me at the time.  Also, one extremely useful feature shared among the series mode protection units like ZeroSurge and Furman with SMP, is the undervoltage/moderate over voltage shut off.  I've been sitting in the living room minding my own business when the lights start to flicker, and my Furmans immediately shut completely off.  Turns out a vehicle had been too friendly with a power pole.  Sometimes I've come home to find the EVS alert on another unit telling me the power was cut off for safety.  Between that and the times my UPS start chirping I know for a fact I get more power issues here than just predictable weather. 

Thank you @erik_squires ! Super helpful. I’ve ordered the -20 PFi (the Rowling is nominally a 20A device) and should have it by Saturday. As others have noted, ultimately the test is how it sounds in my system, and it’s an easy return if —unlikely i hope — it doesn’t perform here as well as it does for you (and as it is designed to).

The engineer that designed the furman left and went to audioquest. The furman it 20i  has large capicitors to handle the transients on my big monoblock amps. I think 80 amps in reserve. The big audioquests have the same capicitor like magic box with amps for transients as well. My power browns out at least once a wk. I can't risk plugging the amp into the wall. I don't think I have lost any sound quality through that brand of power conditioner, however I have not had a dead amp yet.enjoy the science and the music.

BTW, while I do think protection from brownouts is important (EVS in Furman lingo) it's particularly bad for switching power supplies.  A brownout can cause a transistor intended to be high efficiency/binary to turn linear and low efficiency, burning it out.  

I installed a whole house surge protector that clamps down fast and can take whatever happens to be flowing when the shut down happens, even a lightning strike.