Line conditioner...

nor do I think they choke things off if you have a good power supply in your gear to begin with.

A current-limiting power conditioner can DEFINITELY choke off and even shut down amps.  You need to match the conditioner correctly to the amps.

I have gotten great results with Chang Lightspeed powerline filters.

Lower noise, warmer sound quality, and better sound staging.

Works wonders in my home theater also.

Power factor correction, lightning protection, noise reduction, isolation between sources, and no added artifacts.

Not reviewed much. A hidden gem! Visit the website for complete info.

I used other line conditioners and A/C regenerators, but they all had negatives.

No drawbacks with Chang Lightspeed at all!

Look at High Fidelity Cable conditioners

Can someone explain what ’dirty power’ sounds like. You can short the amplifier audio inputs (not absolutely necessary as long as you remove any interconnects) and turn the volume right up and all you’ll hear is any noise from the internal components and any noise that’s made it through the power supply. I get silence (alright a tiny bit of hiss if my ear is right up against the tweeter), my house is 100 years old and wiring probably half that, all kinds of nasty stuff plugged in but no impact on my hifi equipment.