I havn't done any recaps or opamp swaps, but I can tell you it took me 5 mins to cut that limiter jumper and the improvement on these monitors was insane.....
If you plan on just doing the jumper cut, if you want to be able to really see if it's making a difference, just do one speaker, hook it back up, and you don't have to turn the volume up very much until start to notice the stereo image gravitating towards the modded speaker.
Tons of punch and the damn thing starts to resemble what I would call an NS10
.... for which it was created to resemble....... I can understand why they would put in a protector circuit, but it's completely beyond my comprehension as to why Yamaha would allow it to start compressing the transients at 75db......... that's where I starting to hear the stereo image shift over..... 75db.
I've got proacs too.... so I run the risk of popping speakers every day, so if you're going to do this, on your volume controller put a stop so that you can't go over a certain amount by accident. I've got the hs80s the same level as the proacs and I put a stop so it prevents me from going too high on both.
If you don't do anything else, take 5 mins and chop that flipping circuit protection wire, they actually sound like decent speakers now. I couldn't stand them before and had them in a closet.