sounstage too big bad thing

SOmetimes, also, it can just be your ears take time to adapt to a different sound stage as a result of some component change than they were used to before. A bigger soundstage should almost always be a better thing. You may have to tweak and adapt your listening perspective a bit to get used to it.

It took me a good month or two to adjust my listening to be able to get the enormous soundstage I created when I introduced the OHM 5s into the room they are in. It was so much wider in particular than prior, and so totally disassociated from the location of the speakers themselves, that I was totally missing the beauty of what was really going on at first when trying to listen to the speakers. The location of the instruments and recording lines had virtually nothing to do with the location of the speakers and my ears just did not get it at first. Though the speakers did take a while to break in, I think it was more it took my ears some time to "break in" to the new sound at first.

I went the other way. I was in the verge of selling off my Plinius amp but the XLO Signature2 interconnect saved it. When I put the cable in, all the details, dynamics and soundstage come alive. Most importantly, it feels like I've added in a new subwoofer with the XLO cable. I've got two pairs in my system now. I would suggest what other posters have said in trying out different speaker placement before returning the cable.

thanks, Mapman' tried repositioning my chair back 3 feet, and didn't help, may be as you said need to get used to the sound,
don't know how long it will take, but hearing instruments sound coming at you like suspended over your head don't think is a natural phenomenon that happens in real life music events :

Hmm, soundstage should be mostly in front of you, not over your head. You have some interesting but perhaps unnatural things going on, perhaps due to room acoustics?

Synergy is everything. Not all good pieces work well in every room to every ones taste. If you don't like what your hearing and cannot tame it otherwise then you should definitely make a change or two again until things sound right.

Two things I would check; make sure the speakers are firing at the same point by using a digital level on the sides and back of the enclosures and on top of a board spenning the tops of the boxes to check that their height is exact. Next I would check the isolation of the Quicksilver amps ( they may need better isolation to extract as much clarity as possible) then I'd check the pre.
It is very possible the new cable has exposed something in your system and I would pursue this first before changing the cable.