The first part of this upgrade was made several months ago by replacing the original SL1000's with the new replacement tweeters. To anyone who is still not convinced, after about 50 hours or so, these new tweeters really shine. I don't see how anyone could go back the their original tweeter after giving this tweeter a proper break-in. Just my humble opinion.
I would like to take a moment to thank darque knight and bluemdpicker, for pointing me in the right direction on this project.
Darque Knight's SRS upgrade posts and compendium proved to be an invaluable source of information. I would like to thank all the members of this forum, you make this a great place to learn, and make new friends.
After reading about the improvements with the SRS line from darque knight's posts, and similar results from bluemdpicker, I decided to apply the same techniques and components on my 1983 SDA 2's to see if I could gain the same benefits. I also used solen pb caps and mills resistors.
The SDA 2's have two separate circuit boards, the bottom board(SDA) mounts to the plastic circular binding post cover, and the top board (stereo)mounts to a large coil directly above it.
It is my understanding that some other SDA's have a similar design (I.E: SDA 1A).
I will skip ahead to the end results. IMO, to hear the full potential of your SDA speakers, the crossover upgrade along with new tweeters is the way to go.
You really do end up with a new set of speakers! The bass and definition improvements are truly amazing. The soundstage has increased, I hear notes/sounds that I have not noticed before.
Over the last month I have been going through my cd collection again, and I am blown away every day. After about 50 hours or so, just like the tweeters, the speakers come into their own.
With the soundstage/imaging improvements, if you own the Polk XM tuner its really a trip. Its one thing the play a cd your familiar with, but when you have someone else making the selections and they get into a groove you like, the speakers can really surprise you when instruments or effects appear all over your listening room. You XM owners know what I mean.
Pictures and notes to follow,,,,,,,,,,,,