I'm currently finishing off a 12pi build. Inside the fill chamber drawing has seven pieces listed. Do we cut a small 8th piece to fill up to the opening or just leave that spot alone? It would be on MC-8 and be about 2 inches wide.
Hi! I'm itching for long time now to build the 12pi basshorns of yours. Is it possible to have a copy of your plans. Thank you.
Also, is it possible to use this cheap subwoofer (JBL GT5-S12 made in china) for this sub. all I can find are these parameters:
JBL GT5 BIG high end features:
* Rubber coated tinsel leads
* Heavy duty 2inch tougher high temp voice coil
* Double large slugs magnets w/ rubber boot
* High excursion bigger rubber surrounds
* Ultra large 7" 1/2 long excursion conex spiders
* Visible voice coil from see through vent windows
* Thicker stronger metal basket
* Stiff, none flex, light weight polypropylene cone material
* immune to bottom out. aka voice coil slapping or plak plak sound.
# Impedance: Single 4 Ohm QUAD layer coils!
# Frequency response: 23-450 Hz
# Sensitivity: 93 dB
As for cutting it in half, you could do that but do remember that basshorns have small mouths anyway. The 12π hornsub is the rare basshorn that works pretty well in small groups, or even alone. But it is still best when used in groups or four or more.
If you cut one in half, not only do you lose the benefit of push-pull drive, but you also lose mouth area, increasing response ripple. You would need to use a group of them to smooth response back, and you still would lose the benefit of push-pull drive.