Power & line conditioners - One size fits all?


New house. 4 dedicated lines. Apparent ground loop issue. Looking for the least expensive way to fix it all. (ain't we all?)

My thinking is to install a 5 - 7 KVA, isolation transformer at the breaker box, and redirect the ded ckts from a sub panel, if I can shoehorn it into the wall, that is. (it's like 90 lbs.)

OF all the listed issues, the most irritation comes from a harshness in the mids. sometimes Vocals have an edge I just can't stand, mostly female. Music, no problem. Female singers, poor recordings, problem. All my gear is less than two years old. Anthem, Krell, B&W, Velodyne, etc.
I'm thinking all I'll need then is line conditioning for the front end. Right? That being said, which way do I go from here to achieve above average performance? Which "one" LC will do it all? Or is there just one?

No experience in the line conditioning deal. Not a lot of faith in it either, but after seeing all the rhetoric from people online & reviews, if indeed a gain in sonic quality is to be achieved, I'm all for it . . . eventually.

I'm looking for a slam dunk here. . . hopefully.
blindjim
RE BEFORE or AFTER MOVING?
BOTH. The new place is new, not different.

RE EQUIPMENT
Same sources. Different preamp. Went from Sony strv 444ES TO aNTHEM PREAMP, avm 2. Just using the DAC in the preamp, but the same sources. Toshiba SD 3750 DVD, Sony 400 CD Player. I know they ain't the best, but I have run better just to see if I gained by stepping up a few levels. Items like, a Krell stereo preamp, and am about to get/borrow a friends high end Denon dvd player and see if that helps.

Usually, the same thing happens, right off it's good. With improvements in overall quality. thereafter, the hightened resolution begins to show up problems. but right off the bat, usually without exception, they're outstanding.

RE SPEAKERS
FROM the 602, 604, CDM1NT, 7NT,9NT, mONITOR aUDIO GOLD 60'S, *805, *804.
* MARKED IMPROVEMENT IN SMOOTHING THE OVERALL SOUND. if THINGS WORK OUT, GOING TO A PAIR OF 803, lEGACY'S. OR mCiNTOSH'S ls line.

Just which LC provides the best value and will work with amps, as well. I can ill afford to experiment with LC's. they are cost prohibitive, to do so.

NOTE: Did find the cable ground connection. Decided to run another ground, in lieu of using the service ground.
Trying to cure sibilance is not always an easy thing to do. As Fatparrot stated, adding a LC is always a good idea, but I agree with him that it's got more to do with the gear choice. I'd start with the source. Try a tubed output CD player, something like a Jolida or Ah! Njoe Tjoeb, which can be had used for not a lot of money.
super. 'preciate it.

RE SOURCES
The plan is to get either a Rega, sony, Marantz, or if used, possibly Meridian, either in CD or SACD, OR universal PLAYER. sO i'LL DEFINATELY BE MOVING UP IN THAT AREA, AFTER i GET MY MAIN SPEAKERS IN PLACE, AND A 5 CHANNEL AMP STRICKLY FOR HOME THEATER USE. (TO TAKE THE PLACE OF MY HT RECEIVER)

I'M LEANING TOWARDS THE UNIVERSAL ACTUALLY. NO GOOD REASON OTHER THAN MONEY. WOULD PREFER DVDA, AND CD SEPARATES, AS I CAN STILL SEE AND THAT KILLS TWO BIRDS WITH ONE STONE, IF I GO WITH DVDA.

IF ONLY I LOVED HOUSE WORK INSTEAD OF MUSIC! JUST HOW MUCH CAN SOAP, RAGS AND VACUUM CLEANERS COST? CERTAINLY LESS THAN A PAIR OF GOOD SUBS.