I have a chance to buy a pair of excellent condition SDA-1B's or they maybe 1C's. They have the vertical tweeters and are in the black finish. I live in a small apartment and this is about as big a speaker as I have room for. A couple questions....how do you tell the 1B from the 1C? These speakers are 500 miles away so I need to ask the right questions. I've been searching the forums and they seem to be reasonably highly regarded but some real world reviews would be nice. How much should I pay? Asking price is $700.00 canadian dollars which is about $575 american dollars. Anything else to be aware of that anyone can contribute is greatly appreciated. Thanks.