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Here is a document that says a lot about the Polk SDA Models. The 2B model came out a few years after this but the basic technology and product build are the same as the large model in this brochure but mine have one less tweeter and mid-range.
I am sorry I don't have a camera but here is a site that has a picture of the basic SDA 2B Polk. The various models vary only in their exterior treatment. The speakers of course have a black fabric cover (in a wood frame) but the covers are removed for this photo. Mine are in what I consider to be excellent (essentially like new) condition.
You can get lots more pix, specs and reviews by simply Googling for Polk SDA 2B. Let me know if I can provide any more info.
Here is a pic of the SDA 2b model without the front cover.
Try this llink: http://www.google.com/search?hl=en&s...w=1136&bih=568