These are a pair of old Audio Concepts DV-12" woofers. In 2011 I posted a bunch of measurements of theses.
https://www.diyaudio.com/forums/subwoofers/190727-subwoofer-testing-orientation-ii.html
Note that the T-S parameters for the two drivers are different. The box one was in had "BAD" written on it when I received them. I don't know which one was bad. They both work.
Pick up in St. John's neighborhood of Portland OR only. PM me for a time to pick up.
-Byron
https://www.diyaudio.com/forums/subwoofers/190727-subwoofer-testing-orientation-ii.html
Note that the T-S parameters for the two drivers are different. The box one was in had "BAD" written on it when I received them. I don't know which one was bad. They both work.
Pick up in St. John's neighborhood of Portland OR only. PM me for a time to pick up.
-Byron