Selling a pair of classic Polk speakers. They don’t make it like they used to anymore. These speakers will shake your house so please don’t buy them if you live in an apartment. I know how much these are worth and they last for ever. Perfect for your Home Theater. Model # SDA-1c , anybody who knows stereo will know of the Polk SDA series from the mid 80s.  These are the SDA-1C model featuring 2 dome tweeters, 4 midrange and the woofer.  These cost $1600 a pair back in1987 when that was real money.  They are pretty efficient but will sound best with a high current amp of 75watts or better. Years of Production: 1987-90 Original MSRP: $1,600/pair Drivers: 2 - 1" tweeter, 4 - 6.5" midrange, 1 - 12" sub-bass radiator Dimensions: 44"H x 16.563"W x 11.5"D Weight: 85 pounds each Specifications Frequency Response: 15Hz - 26kHz Impedence: 6 Ohms Recommended Power: 50 - 500 watts per channel Efficiency: 90dB