This is a pair of DIY open baffle woofers, previously used with great success in a DIY speaker project which included an 8" fullrange driver and tweeter on open baffle and crossed around 100hz. The woofers are 15" vintage, most likely Jensen or Eminence. They have alnico magnets. The Qts is high, which allows these to be used on OB without EQ. The build is 18mm birch ply, with two layers (36mm) on the front baffle. The effective baffle width is about 48" wide, and response is down to about 40hz without EQ. $120 for the pair. Pick up in Westport, CT 06880, near New York City.
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