[dmbr]

This looks interesting, but it's quite pricey...

Quantum Plug-In (Gold) https://www.amazon.com/dp/B00JEKPB8I/ref=cm_sw_r_cp_awd_sdKZwbPNW4CF3

http://www.alanmaherdesigns.net/#!qpi/c1j2j

I already use a PS Audio Noise Harvester with a Furman P-8 Pro Series II Linear Power Conditioner, so I'm not sure if a QPI would be overkill...but I've had good results with the former two power-cleaning options.

Thoughts?

 

[Speedskater]

From that link:

1. Filter Bandwidth: dc-40GHz
2. Noise Reduction: -85db evenly across the filtering bandwidth

 
The only thing that can meet those specs is a dead short.

 

[dmbr]

From that link:

• Filter Bandwidth: dc-40GHz
• Noise Reduction: -85db evenly across the filtering bandwidth

The only thing that can meet those specs is a dead short.

Ah, so you're saying they're making impossible claims?

 

[Speedskater]

It's a nonsense specification. Anything that filters everything for DC to light is either a short or an open.
But let's skip over the specs and just look at the product.  It's just a toy. It can't do any meaningful power line filtering. Good power line filters (those that filter at the frequencies that matter) are real big and heavy.