posted
k can you help me. i designed a box for a 12l7 but i dont know if its right. -2.25 cubes total after displacement -inner dimensions 23x16x12.5 -ports are 3x3x14.75 -i will have 2 pieces of wood separating the two chambers they are .75x16x12.5 -with displacement, i calculated 2.654 -tuned to 35hz, is this correct? any help is appreciated, thanks.
Posts: 13 | Registered: Sep 2001
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posted
i get to be the first to post on the 2 year anniversary........wow. anyhow any ideas on one of these bad boys for a fosgate punch hx2 12...........brett
-------------------- Brett Children of the Corn Team Mayhem Posts: 762 | From: iowa | Registered: Dec 2001
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posted
to calculate the port lengths with WINISD do I say i want a 5cuft box(my abc is this size after discplacements) tuned to 35hz. I want to use 5" diameter PVC. Anyways I put all that info in saying i want 2 ports... I got the length to be 13" now do I divide that by 3 to get the length of what each of my port should be?
-------------------- Why won't they just give that rabbit some damn cereal, sheesh. Posts: 900 | From: ARLINGTON, TX | Registered: Apr 2001
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quote:Originally posted by 5283: k can you help me. i designed a box for a 12l7 but i dont know if its right. -2.25 cubes total after displacement -inner dimensions 23x16x12.5 -ports are 3x3x14.75 -i will have 2 pieces of wood separating the two chambers they are .75x16x12.5 -with displacement, i calculated 2.654 -tuned to 35hz, is this correct? any help is appreciated, thanks.
this box would be too small for an ABC.... you would need closer to atleast 6 cubic feet of net airspace.
2.6 cubes might even be a little too small for a regular ported setup....
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
posted
ok, by request. To calculate proper port length using winISD, use the large chamber only as the total volume. Then multiply your desired tuning frequency by 0.9. Use the port length found for ALL 3 ports.
Say I have a box that is 3 cu ft after displacement for both chambers, or 2/1. I would use 2 cu ft as the volume. I've decided to tune my box to 33 Hz. 33 * .9 = 30. I would calculate a port for 30 Hz tuning and a box 2 cu ft. Just pick a diameter. It's pretty easy, and leave room for tinkering. ie, make the ports 2" longer than usual and trim them after. Or you can tinker with stuffing. I've yet to see a report on abc boxes and stuffing effects.
Posts: 768 | From: Ottawa, On, Canada | Registered: May 2000
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quote:Originally posted by Rodon: Should I/could I use an ABC box design for two Shocker Extreme 12" mice?
Probably two different boxes I assume.
What kind of SPL comes from this design - what is the true benefit?
What would I tune it to - my rez is 49Hz?
Man this post is long long.
u don't want to tune near your res frequency. this box is kind of a loud sq box. if u want spl go with a regular ported box with slot ports. i am going to be building a ABC box soon for a shocker 12. here's what i got if u are still interested. 5 cubic feet total 3.33 cubic feet larger chamber 1.66 cubic feet smaller chamber 5 inch diameter round ports 15 inches in length tuned around 33 hertz mr. flamboyant helped me a little with the port length. if u have ne real technical questions.....ask him
posted
C'mon you people let it reach on page 3. I thought you were trying to keep it at the top
Posts: 20 | From: Trinidad | Registered: Nov 2001
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posted
I was at a Bose radio outlet store in Grove City, PA and one of there displays was a plexi box so you could see everything. The best way to describe the thing would be an ABC-Bandpass or a Dual-ABC. there were three chambers.
#1 the biggest chamber held a large port to the outside of the box. And 3 small ports from the other chambers
#2 held the body of the subs (facing the rear wall,mounted into the 3rd chamber) and was 1/4 the size of the biggest chamber it had 2 small ports that led into the biggest chamber.
#3 was 1/2 the sides of the biggest and 2x the size of #2 (the middle chamber) The subs fired into this chamber and it had a port that passed though the 2nd chamber and back into the biggest chamber.
I hope you can get the picture from that but it was the most inmpressive enclosure I've ever seen.
For example Chamber 1: 4 cube w/ 1 big port = 35hz Chamber 2: 1 cube w/ 2 small ports =80hz Chamber 3: 2 cubes w/ 1 small/long port =40hz
it sounded pretty low so that's just a guess on tunning.
posted
Dunno about you guys but its a friggin biatch to get a big box in my trunk...trunk maybe big but the entrance to it is not, looks like it's ripping out the front seats again...
-------------------- Why won't they just give that rabbit some damn cereal, sheesh. Posts: 900 | From: ARLINGTON, TX | Registered: Apr 2001
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your only going to have 4.5 cubes RAW airspace (b4 sub & port displacement)
i have no personal experience with the 9512, but i remember hearing that they like larger ported boxes.... SO, if a sub USUALLY likes a "larger" ported box, and ABC box would need to be even "LARGER" (to work properly/maximum potential).... otherwise, you may have to do just regular ported....
so back to the drawing board let me know if i can help more,
-Wes
-------------------- - Wes Sowers - Discount Car Stereo L.L.C. Kent, Wa 98032 (206)824-5875
quote:Originally posted by Toomuchnoise: I was at a Bose radio outlet store in Grove City, PA and one of there displays was a plexi box so you could see everything. The best way to describe the thing would be an ABC-Bandpass or a Dual-ABC. there were three chambers.
#1 the biggest chamber held a large port to the outside of the box. And 3 small ports from the other chambers
#2 held the body of the subs (facing the rear wall,mounted into the 3rd chamber) and was 1/4 the size of the biggest chamber it had 2 small ports that led into the biggest chamber.
#3 was 1/2 the sides of the biggest and 2x the size of #2 (the middle chamber) The subs fired into this chamber and it had a port that passed though the 2nd chamber and back into the biggest chamber.
I hope you can get the picture from that but it was the most inmpressive enclosure I've ever seen.
For example Chamber 1: 4 cube w/ 1 big port = 35hz Chamber 2: 1 cube w/ 2 small ports =80hz Chamber 3: 2 cubes w/ 1 small/long port =40hz
it sounded pretty low so that's just a guess on tunning.
