Subwoofer power conditioner

I use a Furman as erik_squires mentions above for my REL subs.

I'm using a Niagara 1200 on a dedicated circuit for the 2 front JL F-113's. The other 2 are on the same dedicated circuit but since they are on the other side of the room, they are just plugged into a couple Furutech outlets.

ozzy

I honestly just bought my power conditioner for better cable management. 

I plug my 2 Rythmik subs and 2 REL subs into PS Audio power regenerators. I’m in a rural NC county.

As a general rule, never plug anything worth a premium directly into the wall unless you have whole house surge protection installed, i.e., Get an electrician in and get a Siemens unit or similar installed. It is not just a safety net for audio equipment, but also for all your expensive home appliances and so on. 

If you want any additional conditioning to improve sonics of any amps, powered subs w/plate amps, etc, try the Audioquest Powerquest series. Plug your subs into the outlets dedicated for power amps. You would go higher up on the power conditioning expense chain if you're dealing with cost no object gear.

https://www.audioadvice.com/audioquest-powerquest-505-power-conditioner