troutstreamnm
I do not own a sub, but I would not plug it into a power conditioner.
I run all of my "low amperage" components into my power conditioner: preamp, CD transport, DDC (digital to digital converter), DAC, streamer. I do not run my various amps through my conditioner, as I have found I prefer the sound when they are plugged directly into the wall outlets.
That said, I did find three things that helped greatly:
(1) Having 2 dedicated lines pulled, one for the conditioner and one for amps
(2) Using audiophile receptacles, I can highly recommend: Furutech GTX-D $170 (gold plated) or GTX-D $205 (rhodium plated), Oyaide R1 $180, and am testing the Acme Audio Labs Silver $55 with good results for an affordable option
(3) Using higher quality power cables, but I've found no need to go to ridiculous expense. Excellent options are: AntiCables Level 3 $330, Zavfino Fina OCC $345 (signal components) or Zavfino Majestic MKII OCC (power amps) $450, and DHLabs Power Plus OFCC Cryo $20.....are all great affordable options.