Hey guys,

I have 2 Punch XLC 12" subs that each need 1.25 cubic feet of a sealed box. Can I just make one large 1.25 x 2 = 2.5 cubic feet box, or do I need to seperate them inside intwo two chambers?

Thanks!

 

You can build it as one large box. It helps though to have a center section in one of two ways. If you have a center divider and you have a sub fail, then you can still play the other sub. With a common chamber box this cannot be done. The next thing it does is to keep the box from flexing due to air pressure. So while it can be done, it is recommended to put a center divider in.

 

If you are runing them stereo you definatly need the divider between the 2 subs

 

^ how come?

 

running in stereo mode the subs will be doing differant things, when you run mono, they are getting the same signals, when you are running stereo they are getting differant signals.
shared air can pound like mad, but the sound quality will suck.
If you do shared air, doubling the box size is an incorrect method cause each woofer will see a 2.5 cf box diminishing your woofers effinciantcy.
when building a shared air box it takes a little more math skills than doubling box sizerequired for the woofer.

 

Actually nothing below 300hz is really in stereo as we couldn't tell the difference anyway. There are some cd's where they might pan the music left to right but it's not stereo. Building a shared enclosure is just fine and sounds great as long as you build it strong. Add bracing to keep it from flexing.

If you have 2 woofers that want 1.25 cu ft each, a shared enclosure will be double, no math skills needed. If the box is going to be ported, then the ports will be different but the size will be double for 2 woofers, triple for 3 woofers, etc. etc.

 

um ok 1.25 a woofer build the box at 2.50 and blowem some people, like i said each woofer will see a 2.50 cf box. math is involved

 

So by your reasoning then if I put 2 woofers into 1.25 cu ft they'll both see 1.25 cu ft?

If I have 2 woofers that want to see 1.25 cu ft each, what is my box size going be if I build a single chamber enclosure???

According to LEAP, it's going to be double. Sure I can play with it a bit but basically you add up what each woofer wants depending on how many you are running. If I have 4 it'll 4 times as big as 1, simple.

 

Two woofers require twice the volume as one. Rob's input way back at post #2 answered the question entirely.

 

Thank you! The only difference in building a single chamber box for multiple woofers will be port size and length if you're building a ported enclosure. If it's sealed it will be double what 1 woofer wants. This stuff is just tooooo simple!