Started some mods last weekend I been wanting to do. Plan on upgrading the crossovers, installing
the steel rings from Larry, Dynamat Extreme on the drivers and PR baskets, and upgrading the
tweeters to the newer RDO-194.
Sent the crossovers to VR3Mods/Trey to rebuild using Gimpods(Tony) custom boards, which are very nice
by the way. Trey uses some quality parts for these and has been great to deal with too.
Also called Helen at Polk Audio today and ordered the new tweeters. She was very nice, professional,
took care of my order in no time.
Expect to start installing the rings and Dynamat this weekend and will post some more updates later on that.
I thought these speakers sounded great before; after all these mods I fully expect to blown away after a little break in time.
When pulling out the drivers I noticed a few weird things I wanted to share and maybe
get your opinion about. Inside the Left Channel was large magic marker written "Bad Topseam", which I hope
was some problem found during production and corrected. Also, the Stereo drivers , one is a 6511 and one is a 6510. I had the schematic and both stereo drivers were supposed to be 6511. Maybe does'nt make any difference.
The Dimensional drivers are the correct 6510s. I verified all the wiring is correct per the SDA-1C schematics.
One MW6510 date stamped Jan 3 1992, kind of newer driver, replacement? I did not see any evidence of
repairs, everything looks original and no stripped screw holes. Oh yeah, some of the Polyfill had slipped down
behind the drivers, I assumed it was originally at the top. Last thing, I had not intended to replace the tweeters
until next year, but I read the SDA Handbook and saw where the resistance of the SL2000 Silver Coil was supposed to be at 7.5 ohms, all mine read 8.7-10 ohms. One of the plastic domes had a small split in it too. Glad I read that SDA Handbook, thanks Mr. Smith for a fine piece of work.
This will be my first speaker project. Been a fun project and looking forward to hearing these great vintage speakers sing again.
Thanks for looking and feel free to offer any input.