Picked up the trim rings at the CAF and finally got them installed on my DA-1.1 AP/V2s over Labor Day weekend. Like Laura, I needed to use one additional gasket to raise the driver a bit so that a proper seal could be formed. The video was helpful in showing how to put on the trim rings and the whole process took me about an hour or so. I decided to use a 1/8 hex wrench and do everything by hand--I didn't want to risk damage to the driver but I also found that I had a much better feel for the torque that was being applied and that I could tighten the screws more uniformly by hand. For me it was like the difference between walking a golf course and taking a cart--the cart gets you to the ball quicker but you miss seeing the nuances of how the hole lays out since you gain various perspectives as you approach your ball on foot. I was amazed at how much more securely the drivers were affixed using the trim ring as opposed to just the screws--it left me anticipating what sonic benefits might be in store. I was not disappointed, despite some initial skepticism. I am finding that the overall presentation is more focused, with cleaner vocals rising above a more controlled lower midrange/upper bass. I also hear slightly less "bloom" in the bass, leaving a slightly less romantic sound but still plenty of body. I think in my system/room, where the bass can be ever so slightly accentuated at certain frequencies, the trim rings have brought the lower registers into greater coherence with the overall sound. Overall, unlike for example the AP crossovers or V2 upgrades, the changes I am describing are pretty subtle--but they are noticeable and welcome refinements to what was already a phenomenal speaker system. Many thanks Lou for continuing to make design upgrades available to owners of your earlier loudspeaker designs. This is one of many ways in which your business model is both unique and estimable.