sounstage too big bad thing

It sounds like your new cables have opened up your system. Probably time to rearrange your sweet spot. Without knowing what speakers etc. I wouldn't necessarily move further back. Try different toe in positions. I recently tried crossing over the sweet spot. The left speaker is aiming at my right should and visa versa. I doubt that the cables ruined the rest of your system.

I associate a larger soundstage with increased resolution, always a good thing. I've never heard a too large soundstage, unfocused yes, but increases in depth, height and width have always been positive, the amount of immersion/forwardness can be exasperated by a larger soundstage.

You mention increases in detail, openness with the XLO,based on your description I think it is likely the MIT is failing to reach the full potential of your system in regard to detail and soundstage. I wouldn't give up on the XLO just yet.

Seems you're suffering from an unfocused, forward soundstage, you don't mention height, width and depth being a problem. Your problems with the XLO could simply be exposing issues elsewhere in the system. I've found different isolation schemes can help focus to a large extent, get your equipment off any compliant devices, use spikes and ball bearing devices. You also may have to try different cabling in the rest of your system in order to reduce forwardness. It could also be the XLO will never be synergistic in your system, still, I wouldn't give up on creating a larger soundstage. You can have focus, proper perspective and a large soundstage all in correct proportion, may take some work!

Have you given the cables time to run in? I've heard un-broken-in cables and electronics sound the way you described. After they have been played in for awhile (20 to 100 hrs, depending on the cable), the soundstage perspective and details settle into the proper perspective.

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.