Power Conditioners

I added a Niagara 1200 last year and experienced an immediate improvement in SQ.  Blacker background to music, individual instruments were more distinct, the slightest nuances of music became much more defined.  I'm now changing my system layout by adding a Symposium Acoustics Foundation Rack Ultra.  I'll leave the Marantz theater processor, multi-channel amp, and BD player in my present cabinet/rack and use the Niagara 1200 for those components.  I'm adding a Niagara 3000 for my main audio components going into the Foundation Rack Ultra.  For that setup all power cables are Audioquest Tornado (High-Current and Source).  
The bottom line is that I was so impressed with the outcome of the Niagara 1200 that I am taking everything to a higher level by reconfiguring the system and adding the Niagara 3000, connected to a dedicated 20 amp line, specifically for my main rig.  The Niagara products work exceptionally well.  I stand by them and can't recommend them enough.

@millercarbon knows all. He is never wrong and has the best of the best...for him, probably not for you.

@rixthetrick

Take a look at a PROPER power supply for an amplifier here:

https://www.ti.com/lit/an/snaa057c/snaa057c.pdf?ts=1601059701990&ref_url=https%253A%252F%252Fwww...

And another one:

https://elektrotanya.com/bryston_4b_sst_amplifier_schematic_sch.pdf/download.html

Everything you say you witnessed in the German power conditioner are ALREADY almost all in the power supplies of properly designed amplifiers.

Apart from extreme overvoltage protection and voltage regulation (as I said before, in this case you need to take your power company to court), there is nothing else to gain from spending on a power conditioner.

@dannad,

All large electrolytics are usually supplanted on their side with smaller hi grade mica capacitors around  0.1 -> 1uF to short out the hi frequency noise.

By rectification, I meant to say the peak value of any variation on the txformer output will be caught by the large filter capacitor.  Any hi frequency noise will be snubbed by the capacitors in parallel with the rectifier diodes.

99% of all amps have all these hi freq eliminating capacitors in place.

I bought a power Wedge years ago and it made a huge improvement in my system. When I bought a new system, I also upgraded to a Shunyata Venom strip. It has a Carling breaker to protect your equipment, in the event of a surge, and has a separate power filter that plugs into the strip, so you can use it with or without the power filter.