I have the XOT's- two sets as the horns are biwired. They effect a major change in stage with and depth. I do not hear a shift in frequency. Bass is tighter. Space between instruments does not feel as "dense". I only have 6 hours on them. I certainly heard one or two break in changes almost like an audio degaussing. Will let the system play overnight. If you have the dual speaker leads (which accept both spades and banana plugs) the XOT banana plug version sure is easy to put in and take out for evaluations.
The XOT build quality is excellent. The effect is much greater and on more aspects of the sound than the Walker product.
Not finished the evaluation but the effect the XOT's have on a system should make most serious audiophiles try them on their own system. Postage is maybe $10.00 each way.
Putting them in your system is makes you think how and why you like what you hear.
Ozzy, how many Audio Magic PEA's are you using and where?
I am using five IPC Acoustic Energizers. One behind each speaker, one at each end of the listening couch, and one directly behind where I sit.