Contour Enthusiasts Group Archives Forums Modifications Audio Hey Dave, I've got a Q 4 U 2

Do you have a box design program or something?

As my suspended under the deck box won't work, I'm going to build a vertical band-pass box in the corner of the trunk with the port firing into the hole in the rear deck.

I need to figure out the chamber sizes and port length/diamater but have no idea where to find the info.

Thanks in advance,
-Colin

I've used WIN ISD.
http://www.linearteam.dk/winisd.html

Thanks Aaron. What happened to the old handle?

I've been thinking of going with something a little more creative myself.

-C

WinISD is one of the better free software programs available. That is what I use most of the time.

You can't, Dave already tried ' Creative '.

It's just a poke at Honkeytonk Monkey's message: Here .

I may change it back on Monday.

Aaron

So, what sub/s are you using?

LOL, you guys are funny. Ya'll crack me up!

Dave, I'm using a pair of 8" Audiobahn DVC (4ohms each coil) subs. I'll run them in a circuit to give me a single 4ohm load to bridge to my amp. I got a pretty good deal at $31/ea.

I replaced my Free-Air Kicker with one of the Audiobahn subs just to see how it sounds. It seems that they don't like the Free-Air setup like the Kicker, tho. Bandpass, here I come.

I'm taking a guess that they are model number AW831X, is that right?

You are correct.

It looks like a bandpass using both woofers would need a 1 cu. ft. rear chamber, and a .625 cu. ft. front chamber. The front chamber would need a port 3" round by 6.4" long. This would be the ideal box, but you could get away with a .75 cu ft rear chamber fully stuffed. This set up should give you ~5-6db more output from 50-85 hz, than your infinite baffle setup. It rolls off pretty sharply under 50 hz. With cabin gain, you should have usable response into the mid to low 30 hz range.