I was all set to do the upgrades to my original 2.3's then I saw an ad on Craigslist...... SDA SRS with a center channel for $550. Condition is about a 5 of 10. Have one frozen 6511 and the tweets went out at very low volume so poly switches will need to be bypassed. Grill cloth needs a little work. Also came with a center that has 4 4.5" drivers??? The back says SDA-SRS but they have the Sl2000 tweets and pin blade connector. Anyone? These should clen up nice and a little work will get them looking good. Guy I got them from buys unclaimed storage units and these were in one. I will post pics for help to identify when my iPhone updates to the latest software.