Vintage Foster SP-2710 acoustic suspension loudspeakers for sale. Made in Korea by Foster Electronics for Sears Roebuck in the early 1970’s. They were apart of Sears Professional Audio Series, and are identical to the Audio Reflex SB-450 speakers that were sold out of independent stereo shops.
These are built like tanks. Weigh about 40 lbs each. In excellent condition for their age and don't sound bad. Each speaker sports dual 3" soft-dome mid/tweeters (B035N13) and a large 12" woofer (300L02-26) together with a 2” voice coil and treated cloth surrounds (no foam-rot to worry about).
All drivers are of very high quality and manufactured by Foster Electronics in Korea. The frequency response is 35Hz to 20kHz and the crossover frequency is just under 900Hz. The dimensions are 24.5''h x 15'w x 10''d. Used, but in great condition for fifty-year-old speakers.