I have had a pair of RTA 15Ls since about '91 and am still extremely satisfied with them. I'd like to keep them in pristine operating condition.
I recently listened carefully to each driver and tweeter and they sound fine. I have a couple of questions, though:
The middle "dome" thing in each driver has a whitish ring near the edge; what is this, should I be concerned, can/should it be cleaned, etc.?
Is there a way to tell if each driver and tweeter (and crossover for that matter) is still operating "like new"? Are there aural and/or electrical tests I can perform?
Also, I see in some forum posts that the replacement for the SL3000 is RD0198-1 (silk instead of trilaminate) and is preferred by a lot of posters. Would this be a worthwhile upgrade? I do find the high end a bit harsh sometimes.
Thanks in advance ... Alan