Didn't you already say you have a driver(s?) on the way? I ask because you really should keep all the drivers the same.
That said the PA385 is a great budget choice. Looks like it got even cheaper since I last checked. I thought it was like $220
https://www.parts-express.com/dayton-audio-pa385s-8-15-pro-subwoofer-4-vc-8-ohm--295-040
That driver is featured in this thread: http://www.diyaudio.com/forums/subwoofers/278424-help-reverse-engineering-sim-tham15ds.html
There are some t/s param measurements near the end. I'm concerned that while Fs is spot on, measured Qes is somewhat higher than published. I'm waiting to see what the measured Vas turns out to be...
PS: The build being done at the end of that thread is more of a 100dB 50 Hz horn rather than a 95(?)dB 40 Hz horn.
I did but cancelled it. It was still backordered and not going to ship until end of month.
I haven't cut the baffle yet so I can still call an audible... However, your point in the next post makes me wonder - do you still feel like it's the right choice for a THAM?
Here's where I am right now... mostly glued except for the baffle
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