Most competent amp designs already filter out bogus AC. I would listen to the guy from Spectron...
You might ask Simon for his thoughts on this Brick Wall surge protector/line filter. It is passive and transformerless, although it uses a series inductor. See this "how it works" page.
A goodly number of A'goners use Brick Wall protectors, including me, although I don't recall if anyone is using one with a Class D amp. As you no doubt realize, the current draw of a Class D amp fluctuates very widely with the volume of the music. A series inductor will, to some degree, slow the responsiveness of the current supply to those fluctuations in demand. I don't know whether or not that slowed responsiveness would be quantitatively significant with this device and your amplifier.
If you ask Simon about this, he should note that at the first of the two links shown above very detailed specs are provided, including a spec on "let-through slew rate," which might be particularly relevant.
I use Furman Elite 20PFi with class D Rowland 102 amp. According to Furman's technical data it can provide 55 amperes peak current. My amp is connected to high current outputs. I don't hear any loss of dynamics or other negative effects but my amp can deliver only 150W per channel (with my 6ohm speakers) while Spectron is rated 500W per channel. Furman has very tight non-sacrificial over/undervoltage protection. If you already know about spikes in supply voltage then perhaps installing in addition "whole house" overvoltage protection at the fusebox would be wise.
I'm not sure why you need to regenerate the power when good filtering might do the job and possibly you might need only overvolatge protection, but I would trust Simon who has more experience with Spectron amplifiers.
The only power protection equipment that I ever heard that didn't restrict a power amp in some way was a Running Springs Audio Jaco.
Most power amps are better off going straight into the wall, however, if that makes you nervous due to dirty power, I'd suggest using a RSA power conditioner OR looking into a commercial isolation transformer. I do know one guy who did this, he had two huge commercial isolation transformers installed in his basement (about 600 pounds each). That's some pretty serious coin right there though.
Thanks for all the insight and recommendations.
No doubt that Simon knows more about this than me... a LOT more.
As a relative novice to this stuff, it can be difficult to reconcile what seems like conflicting advice, trying to make the right decisions without spending unnecessarily. That's why I love to have a resource like the good people on Audiogon.
Have you had your electricity supplier check your electrical service? I work for a solar electric contractor and once or twice a year a customer calls complaining that the solar is causing problems like you describe like your battery backups triggering or lights flickering, etc. As the service department manager I recommend calling the utility and having them check their electric service from the pole or ground box to their meter. Most of the time their is a fault in their service and it is repaired by PG&E or whoever. I know this doesn't address your amp/regenerator issue but it might save you some repair bills on your equipment later on.
"sls= sold I write it fast and never read it back. my misstake."
Sorry to be a jerk with one of my few posts......but seriously, this is your response to someone commenting on your poor spelling and incomprehensible sentence structure? I viewed many of your posts, and they all (mostly) read like a teenager posting nonstop on Twitter or some other mindless networking site.
You are posting on a forum with thoughtful, educated, mature users that discredit anything posted with such carelessness. Please slow down and review before posting.
I'm really not that old, or and only mildly cranky.
With my rant over, I'll add that I've never been happy with the sound from my amplifiers plugged into a power conditioner. Granted, I have not tried many of the very high dollar conditioners.