AR-11 Woofer (200003) Measurement, Refoam, Repair
I've been comenting on these woofers #1 and #2 in this thread: http://www.classicspeakerpages.net/dc/dcbo..._id=&page=#7030 but I though I'd discuss the measurements here in this new thread. I mentioned this background in the other thread but please note the correction that woofer #2 is a replacement unit. Here's a picture: http://members.aol.com/basconsultants/AR11WMAG.jpg I've got a pair of AR 11/12" woofers out of AR-11s from the late 70s, both part #200003 (MADE IN U.S.A.) without an
From what I've read in your first post your AR-11's are MKII. I coudn't found an impedance sweep for the AR-11 MKII but I've found one for both the AR-11 MKI and the 10 Pi MKI . I've also found some measurements for the AR-10 Pi MKII that essentially differs from the 11 MKII for the use of an autotransformer in the crossover network whereas the cabinet volume and drivers are the same (AR-11 MKI schematic, AR-11 MKII schematic, AR 10 Pi MKI and MKII schematic) .
The FC is 40.5 Hz for the