Plug in the conditioner! It'll take a little while, like all gear, to run in fully.
Sure... plug in what you have to it as well... if it's designed for everything. some filters are for front ends others for power amps, still others for analog. it shouldn't hurt to try.
One power cord upgrade at the point between the cond and the wall may be of immense help right there!
When I had my Monitor Audio Gold 60s all I had was a sony HT receiver. First I ran a dedicated ckt or two. that only proved out marginally better. Then I added some Monster M1000 ICs. Again, a bit better but nothing to write home about.
then I added a B&K amp, and quickly replaced it with a Krell amp. This was a questionable move at best.
Prior to letting the spkrs go I gave one shot to upscale speaker cables, again, Monster. I regret not having tried out more... but I wasn't then aware of the Cable Co. and their lending - renting library of cabling.
Figuring I had chosen poor components I sold off all of that system save for the Sony rec.
Cabling does matter. Component synergy matters too... but I feel now that with proper cabling and very good components you'll win far more often than you'll lose.
Don't buy things just because of brand name recognition to fill a spot. Think about where you want to wind up first... including what type of sound suits your ears and preffs... and simply go from there.
I feel MA are better suited to HT generally speaking, or with tube gear for music.
A sub won't reduce their top end energy/brightness... I'd look to the EQ in your receiver for that quick fix. it will help fill out and to some degree mask some of the lower midrange sibilence though, but going that way isn't an appropriate path ultimately. it's merely a patch and you're removing more than you are adding.
I tried a few subs too. I now have a Velodyne DD15. I didn't like it too much at first for either HT or music. Messing around with it some revealed a better more suitable setting in it's EQ which solved much of my disappointment. I now enjoy it a lot more. in fact it's very good for either HT or 2 ch. Placement mattered most there and then, dialing it in... and a power cord for it was THE deal.
Get a nice smooth power cord for that conditioner. Get some good cables for them speakers, like Audience or Synergistic Audio active cables, either will translate to other speakers along the way.
There's always two themes for gear you either don't want or don't want in your main rig... trickle down, or resale. I still got the Sony rec. the SR speaker cables, and the PSA UPC 200 power filter, they're just now in other rooms in the home comprising another system and I enjoy them a great deal regularly.
For a cheap but very nice fit for HT and music speakers that are revealing but not bright at all, try looking for some older Phase Tech PC (Premier Collection) speakers like the PC1000 OR PC10.5s. They're great performaers and possess super values. Why more folks don't talk about this speaker line up astounds me. They've been in business now for over 30 years and are quite inovative with several design patents many other speaker makers use frequently today.
Call the Cable Co.!
Good luck.
