This is for one, AR 12 inch woofer for the AR model speakers listed above. This was supplied during later production years. A new surround was installed and the voice coil centered during the process. Tested with test equipment and a music source. This is the heavy duty work horse of most of AR’s larger vintage speakers. Although many of the original 12 inch woofers can be brought back to life with our AR Surround Replacement Kit, this will not solve the problem of a sagging spider or a damaged voice coil. OTHER SPEAKER SERVICE PARTS. The AR speaker is an acoustic suspension design and relies on a tightly sealed cabinet for those low bass notes it is famous for. Please browse our entire store. We have over 200 items listed for the AR fan. If you would like to be advised of new and exceptional items along with our sales, please sign up for our Newsletter. The item “ACOUSTIC RESEARCH AR-3A, AR-LST, AR9, AR11 WOOFER 1990- 1998, NEW SURROUND” is in sale since Sunday, January 5, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “vintage-ar” and is located in Albany, New York. This item can be shipped worldwide.