Changed amps - center image moved

All great suggestions and comments.  It is true that changing amps can/will change the sonic characteristics.  It is, in fact different.  Better in most ways.  I was simply wondering if anyone had experienced a similar imaging change and was able to affect it by doing certain things (like you guys are suggesting).  I will continue experimenting.  BTW, both the TRL and Maker amps are killer.....and I have owned quite a few in my day.  Thanks again!

Great point Ralph, I once owned an amp that was built with one channel wired out of phase. Opened up the amp and quickly figured out that was the issue. 

I've had several instances after I've made significant upgrades that I've had to re-position my speakers to allow for a change in soundstage height or width.

I find a diffuse center image is often 'fixed' by using cones beneath the amp. One amplifier I reviewed came with Audioquest Bigfeet (sorbothane) and I felt the imaging was quite non specific.The designer told me that was his intention as it is more like a real concert experience he said. Well I record with single point mics and the imaging is very specific when the system permits. I consider myself an image freak basically as I have experienced a lot of live music over the years and to me this heightens the reality of reproduction considerably.
 Now another more expensive model amp of the same brand came with Stillpoint feet which I liked more and they imaged fantastically but were also monoblocks. When I put a set of polycrystal cones beneath the less expensive amp I found the image far more focused which is the effect I hear when using cones under my gear. I like to use squishy feets under transports as these create vibrations but I use Black Diamond Racing cones and Brightstar brass cones too. I find I can tune the bass dampening with these but then I also experiment with the material they are placed on and  I have used glass, rubber, concrete, and hardwood beneath my components as my ears inform me. Some of the better stands offer shelves of different materials so I am not alone.
 Sometimes it is the chassis itself and mass loading works wonders. I like to use aquarium stones which come in an nice bag. Sand is just too deadening. The $2500 amp had a rather flimsy top as opposed to the 5X more expensive model that was hewn from a solid billet, which is why you see this done on many high end electronics. On occasion I directly damped the circuit board with small pebbles (remember the diamond dust filled YBA gear or Shun Mook dots?).
 Balanced inputs usually also have additional buffer stages or transformers than do the single ended ones that I find degrade the sound. Check out schematics if you can I am not making it up. They just create the phase flopped output leg in most cases and buffering. However true symmetrically balanced circuits which are very rare do indeed perform better with a balanced input but then the preamplifier must also be true balanced. On my Tascam DV-RA1000 optical disk recorder the balanced input runs thru more than 3 additional opamps then does the unbalanced inputs for instance. Same with my Nakamichi MR-1 ins and outs. Balanced lines are designed for long runs that require common mode noise rejection. Not ever needed in any of my audio systems but you bet my microphones are all balanced lines. YMMV

Returned from Mexican vacation and the adapter arrived.  First I simply reversed polarity on one speaker...improved center image (using the XLR cables).  Then, switched to RCA IC's with the adapters (at amp only).  This fixed the problem!!  Perfect center image and huge depth in soundstage.  RCA out of Theta (no adapter) to Maker amp with RCA to XLR adapter......sounds fabulous!  The Maker amp is great.