Amir is offering that if someone wants to send him the upgrades or any upgrades, he'd be willing to test them again.
If Amir is genuine in his offer and intellectually honest, this is an excellent opportunity to test assumptions about the speakers and speaker design in general, understanding that we are not necessarily measuring everything that is important. The XLS Encore is an excellent platform to test:
1. The effects of cabinet round over, bracing, absorption (No Rez)
2. The effects of break in (e.g., BNIB speaker with a second speaker with 100 hours of break in)
3. The effects of crossover components, base vs. stage 1,2, or 3 upgrades.
4. Changes in wire, tube connectors, etc.
If the site really is Audio Science Review, Amir and his fan should welcome the chance to objectively confirm or dismiss common assertions regarding components, break in, etc. I think that there are enough people with different XLS Encore builds that we may all learn something meaningful.