View Full Version : SPL BOX for 2 SI MAG 15's

10-18-2007, 02:21 AM
Hey guys,
I currently have a slot ported 7.6 cuft box (internal after all displacement) for two SI MAG 15's. Its tuned at 40hz. It's the biggest box I could fit into my car with the available space I had. It sits 2 inches behind the front seats in my '98 TransAm.
I have 1/0 for the Big 3, Irragi 260amp alternator, Kinetik 1800 up front. I'm running two JL 1000/1 amplifiers for the subs, one to each.

I've hit a consistent high of 148.3 on the new termlab at 47hz. Is there anything I can do with my CURRENT setup by modifying the box to increase my spl score? Right now its still fairly musical. It has a 120sq inch vent 13.75" long.

I was thinking about shortening the vent length to 4.25" having it tuned to around 50.... should peak output at around 56hz i think.

any spl gurus got some advice for me OTHER THAN GET NEW AMPS, or YOU NEED MORE POWER....or CHANGE SUBS.....? using my CURRENT SETUP.

GOAL: 151 on the termlab with my current subs and amps without having it ONLY be a "one note wonder".


10-18-2007, 02:44 PM
Small boxes tend to work well for spl, so I'd guess around 3.5 cube per sub. Do an aero box with external ports so that you can easily change tuning. To get the loudest score you have to change one thing at a time and test.

10-18-2007, 02:47 PM
50hz is not very musical (one note wonder)

10-30-2007, 04:49 AM
i had a system that peaked at 60hz and was still musical. epicenter helped with that.

10-30-2007, 12:36 PM
if you was to effectively make your cabin smaller (wall it :up2somet:) you would be louder ;)