Definitely a great sub. When tc was going strong a couple years ago there were more build threads with this woofer than I could count. Im sure if you did some searching you could find a number of them.
the only way I would use a round port on this is for an ultra-low tuning frequency.
A folded slot port is the more likely choice. Though an ultra-low 4" port tuned to 12 hz has a low enough rear port air velocity to be fine. I still prefer the large folded port. I'm sure Chris would probably suggest it and I trust his opinion.
I'm not sure how low I'm going to tune this. Apparently the guy that used it only used it for 30minutes and it was too much for him. :bigsmile:
I'll probably just tune it to 20hz if I can get the air velocity low enough.
There isn't a lot down to 12 hz anyway. Though I'm tempted to try it and see if I like it. Crazy yes. But might be a valuable learning experience.
I just built a pair of sonosubs with the TC1000's, although 15" versions. The 12 really shines in a ported enclosure, they are a lot better than if you were to use them sealed. TC's rec's for larger box is 3.0 cu feet net tuned to 20 hz, for that driver.
If you enter in the parameters in WinISD, you can play around with box size and tuning and confuse yourself more... :devil: it's ok, you can come and ask more questions later on. :reading: