I have a pair of SDA's marked only "SDA" on back. I always thought they were 2b's but recently reading I have some question in my mind. They have a single sl 2000 tweeter and 2 drivers along with the 12 PR. The interconnect is a blade blade style. The cabinets are a dark wood vinyl sticker.
I have sound coming from both tweeters but the tonal quality is different. I have noticed this before but really only started investigating last night. I pulled both tweets and they are SL2000's although one is marked 1c and the other 2b. I switched the tweets and the problem followed the tweeter. The "bad?" tweeter sounds more muted and flat while the good one is crisp (like I feel they should be). I performed all of my listening tests with the interconnect unhooked, mono mode and with bass turned down and treble up so the problem would be accentuated. It seems that when the cable is hooked up, in stereo, and with bass and treble set to normal, the problem is difficult to hear (it seems the "bad?" tweet blends with the good one). I guess the problem is that one tweeter doesn't sound like the other although it is still functioning.
Anyone else ever hear of similar problem? I have Ken S. sending me the SDA test list to make sure there isn't something else causing this. I assume the only solution is to replace the SL2000 with one which sounds similar.