i think im gonna do a new box for my alpha ... right now i have it sub and port forward... i think im gonna make one so i can put my back seat back in ....
sub up port up ... 3.5 cubes 32 hz 70 inchs of port
Alpha 15" sound best with 40-50 SQ port. 70 will increase SPL though. If you want to send an email to revolutiondaudio at yahoo.com I can help you with a design. I got my 4 15" up to 154.9 in the kick and 152.6 on the dash peaking at 40-41hz while the boz is tunes at 37hz.
I am becoming a fan of tuning a little higher and useing a larger box to acheive a low F3. that was you get a ton of SPL and still get the low end notes.
By box has a f3 of 31.5HZ but they got 4.25 cubes. If i used a 3.33 cube box my f3 would have been 35.5HZ tuned at 37.
