4th order specs

[ford_50]

Does anyone by chance know a place to find specs for a fourth order box. I running a single cerwin vega twelve. Dual voice coil rated at 250w. I'm running an Alpine V12 amp which is 4 x 100. I'm gonna take it down to about 4 ohms. It's going in a trunk of a 1993 corolla.

[sr20de4evr]

not sure what you mean, are you going to try to build one? or have one built? or are you trying to figure out the design of your current box? And what do you mean by "I'm gonna take it down to about 4 ohms"?

[ford_50]

I'm not quite sure why I said "I'm gonna take it down to 4 ohms". My amp spec sheet says it's stable down to 2 ohm. I'm building the box. Maybe the best bet is calling cerwin vega.

[sr20de4evr]

yes the amp is most likely stable at 2ohm stereo and 4ohm bridged, since you have a 4ch amp and you want to power a single dvc sub the best way to do it would be to bridge each pair of channels to each voice coil seperately, but this will only work if each coil is 4ohm or higher. If your sub is dual 2ohm then the only thing you can do is wire it in series and bridge one pair set of channels to it, leaving the other pair of channels alone.

As for the box specs...to be completely frank, if you don't know exactly all of the planning that's involved in bandpass boxes or how to make a bandpass box properly then you really shouldn't do it. The chance that you'll actually wind up with something decent is slim to none, and the chance that you'll end up with something that sounds like ass and will possibly damage your sub is pretty high. You'd be much better off building a simple ported box instead. Even if you get the bandpass box perfect (which is hard even if you know exactly what you're doing) you'll end up with something that's only marginally better than a simple ported box anyway.

[ponchonutty]

Originally Posted by sr20de4evr

yes the amp is most likely stable at 2ohm stereo and 4ohm bridged, since you have a 4ch amp and you want to power a single dvc sub the best way to do it would be to bridge each pair of channels to each voice coil seperately, but this will only work if each coil is 4ohm or higher. If your sub is dual 2ohm then the only thing you can do is wire it in series and bridge one pair set of channels to it, leaving the other pair of channels alone.

As for the box specs...to be completely frank, if you don't know exactly all of the planning that's involved in bandpass boxes or how to make a bandpass box properly then you really shouldn't do it. The chance that you'll actually wind up with something decent is slim to none, and the chance that you'll end up with something that sounds like ass and will possibly damage your sub is pretty high. You'd be much better off building a simple ported box instead. Even if you get the bandpass box perfect (which is hard even if you know exactly what you're doing) you'll end up with something that's only marginally better than a simple ported box anyway.

2nd that above. I rarely build bandpass boxes anymore unless I have a real poorly designed sub or a poor vehicle like a convert or Wrangler. Bandpass boxes require much skill to build properly. You need to know the perameters of the sub and the general makeup of the vehicle.