Hello, I have a pair of KLH 20's with as far as I know original parts. Also have a friend that picked up a pair of 17's. I had posted here last week, got account deleted due to spam problems I believe, was re-instated, then just had to create an account again. (Same username). Anyway, This time I'll copy what I submit. I have in hand some AR sealing glop from the AR guy here, but am curious about before and after tests to run, I just ran a sweep with the calibrated mic about an inch from the woofer on one unit. I also am getting a buzz on some pure tones that look unrelated to voicecoil rubbing and the like. I think it is the dry cloth radiating its own harmonics from tyhe cone edge, hence the before/after to confirm. I see a broad peak at 75-80hz with a linear roll-off to 20hz, start of graph. the slope is very linear about 45 degrees exactly. The cone has no spring=back delays, so obviously cloth is porous. I would like to remove it, check free-air resonance, maybe tone bursts on a scope, etc. I am using REW with a calibrated Dayton emm-6 through an ART USB Dual Pre to (cough) Windows 7 laptop. (I prefer Linux, but too lazy at the moment to bring in my other machine). I anyone has ideas or suggestions on the before tests before it is too late, please jump in. I also am going to do the whole system and room of course. I will be replacing the (at present functioning) capacitors of course, and I repaired the tweeter coil wires last week, and they sound ok. The bass is pleasing even in their present state so much that I disabled my room subwoofer on the home theater display room. I'll post updates, but I am going to switch to playing with my ADS L-710 units for the moment.