Forshadowing--was Steve C. can you hold my hand etc. - Chevy Impala SS Forum
 
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post #1 of 7 (permalink) Old 06-12-2002, 06:25 PM
sinsstr
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I thought maybe you could point me in the right direction on this. I want to build a 4th order bandpass enclosure for two 12" subs, but I can't seem to find any consistency on the web as far as calculating box volume. Basically I want two sealed chambers, each with their own driver, and one vented chamber in the center for both to play through. One site I was on simply said to double the Vas number and proceed as if it was a single speaker box, but would I split the sealed box volume between the two woofers? Another site said that to do it the way I want you would calculate the same as a single driver, then double the volume of the ported chamber (in effect, putting two 4th order enclosures together, joined at the port).

Being cool makes my head hurt! It's entirely possible the two designs I described above are the same, and I'm just not seeing it. An easy to follow formula from someone who knows what they're talking about would be very helpful.

Thanks!
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post #2 of 7 (permalink) Old 06-20-2002, 10:09 PM
sinsstr
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ttt - anybody got any input on this?
post #3 of 7 (permalink) Old 06-22-2002, 11:03 AM
4doorSS
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lol yea heres some help and suggestion...Deffintely have Steve C answer this!! HEHE
 
post #4 of 7 (permalink) Old 06-22-2002, 12:54 PM
zoso
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design the box for 2 speakers. Divide your sealed area in half (half for each box) and keep the vented portion the same size.

That is going to be a huge box if you have it tuned correctly. Might want to go with one woofer or seal 2. 1 12" woofer in a correctly tuned bandpass has the potential for being very loud, especially i you have the port fire directly into the cabin.
post #5 of 7 (permalink) Old 06-23-2002, 05:55 PM
camel
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why a bandpass box? just wondering why you don't go normal ported? check out termpro.com they have the ultimate audio forum, they will tell you all you need to know, maybe even calculate the box demisions for you.
post #6 of 7 (permalink) Old 06-29-2002, 08:17 PM
sinsstr
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Well, after debating for a year I finally started building the box. I was scared for a second that it wouldn't fit into the trunk assembled, but I managed to wrassle it in there!





On another note, my intention is to port the bass into the cabin thru the armrest hole in the back seat. Anybody have a good reason not to take out the metal brace that's in there? Aside from that, it's only insulation and a strip of leather between the trunk and the cabin. (With the armrest down, of course). My car's not going to cave in in the middle if I take it out, will it?
post #7 of 7 (permalink) Old 06-30-2002, 07:29 AM
camel
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hows she sound? is that particle board or am i seeing things? looks pretty good tho, i can't wait until i start on my box.
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