Quote:
scathontiphat wrote:
 4 ft^3 with 18Hz tuning definitely looks good in my sims (not sure if i'm doing it right though, as it looks significantly different than plot).
Couple questions on it.
1) what are the ill-effects of this higher tuning?
2) Is the tuning low enough to get away without using a high-pass filter? Or do I need to worry about the woofers unloading?
3) With 4 ft^3/18Hz, group delay crosses 10ms at ~28Hz, and it's up to 27.5ms at 20hz. Is that still okay?
attached are my plots for 5ft^3/15hz (grey) and 4ft^3/18Hz (blue).
thanks for the help guys! Can't wait to get to some building! |
My plot looks the same as thxgoon's. Check the parameters you entered in WinISD and verify that they are correct.
1) A higher tuning is a trade off. You're gaining more Spl at the expense of lower output. With a sub with only 9.1 mm xmax, you can't have both.
2) A high pass filter is required at 18hz to protect the driver from over excursion while maintaining the maximun Spl this alignment is capable of.
3) Group delay shouldn't be a problem.
When you do build this, post some pics!