Last summer I purchased a pair of SDA2B's. I listened to them and found them hard sounding on the top end with the SL2000 tweets. I purchased a pair of new tweets and it sounded better but not great. I placed them in the garage with a receiver to burn the tweeters in and the same sound emitted.
A fellow Polkie George Daniels told me to do the crossover upgrades and that it would transform the 2B's. I kept putting the ordeal off until the New Year.
I could really kick myself for not doing this earlier. The 2B's are fast, transparent and present a pretty good sound stage which I hear will get better with time as all capacitors burn in. I use a Clarity Cap 12uf for the tweeter section. All other caps were Solens and I used Mundorf MOS resistors and removed the polyswitch and put a mundorf resistor in it's place.
I'm in the 2nd week of it burning in. I can tell you I like what I hear. I have a friend that is trying to buy them from me as we speak. I have a pair of ET LFT16's and 2 pair of Spica's. The sound stage on the 2B's is nearly as good as the Spicas and getting better everyday. They blow the ET's out the water. I remind you the ET's are a bookshelf speaker. They will be for sale within the next week. For now my search for a large floor standing speaker that does not bloat my room with bass may be over.
My system: VanAlstine Super PAS3si modded by Tom Tutay of Transition Audio Design, Dynaco ST70 modified by Tom Tutay, Arcam DV78 DVD player w Scott Nixon Tube DAC and a wideband transformer on the digital out, Systemdek IV ( not the IIX mind you) electronic turntable with a Rega RB600 arm and Audio Technica AT OC9MRII cartridge with a Hagerman Piccolo head amp, all plugged in to a Furman Line conditioner. I have recently added a Teac 3340s Reel to Reel. I have 1 pr Spica TC50's and my previous main speakers are Spica TC60's. and last a Pair of Dali Suite 12" acoustic suspension powered subs. All wire is by Transition Audio Design with a piece of Straightwire interconnect on the phono.
"That's All Folks!"