I purchased one of these for testing purposes and found them to be one of the best SQ subs I have heard and with the bonus of REALLY nice output.
I then purchased a few more to offer on here as I really think they are THAT good.
I tested in a 1.3ft^3 sealed enclosure and the sub hit hard and was articulate and VERY linear. Smooth and powerful. Low distortion.
It is pretty massive (weighs 35lbs and 7.75" Deep) and should have a huge Xmax number, if it was available. Thiel had a 1200 watt amp on this when they used it in their sub system. For my testing, I used an ARC KS1200.1 at 4 ohm (so about 650 watts) and it never was under any stress. This sub has a black anodized aluminum cone.
Anyway, here are the measured T/S Parameters...
R(e)= 3.8483 Ohms
F(s)= 41.72 Hz
Q(ts)= 0.5757
Q(es)= 0.6088
Q(ms)= 10.59
V(as) = 27.34
Grinder was able to put together some ported options in this post (#20)......
https://www.diymobileaudio.com/threa.../#post-5761819
I have 6 Brand New and 1 lightly used. If you have any questions, let me know and I will try to answer them.
I am asking $300/shipped to your door in the US48 for the new ones and $275/shipped for the lightly used one.
I accept PayPal: jerry_hdma@cox.net (underscore between jerry and hdma)