logspace Posted June 11, 2012 Report Share Posted June 11, 2012 I have a bunch of 3/4 inch MDF board and am building a sealed enclosure for my 2 Alpine Type R's. Everyone says that they are better ported, but I want them in a sealed box. If they don't sound good, I will build a ported box. I have plenty of MDF. I think Alpine's specs are too small (0.57-1.00 cubic feet per sub) What is a good volume for these subs. I've heard they are good in a 1.6 cubic feet per sub, but I don't know. So what is the ideal sealed box volume for these subs? Link to comment Share on other sites More sharing options...
logspace Posted June 11, 2012 Author Report Share Posted June 11, 2012 bump Link to comment Share on other sites More sharing options...
Tarball Posted June 11, 2012 Report Share Posted June 11, 2012 Isobaric in a deathbox. http://www.decware.com/newsite/dbk12.htm I have had a single type R in one of these and it sounds amazing (for a single type R). CURRENT SYSTEM: Alternator: Stock alt on mids/highs Isolated DC Power 270 SP - Charging @ 16.8v Batteries: (2) XS D1400s Power Cable: Double Runs of 1/0 KNU Kolossus Fleks Headunit: 80-PRS Sub Amp: DC 5.0k Subwoofers: 2 RE MT 15s /PSI dual .7ohm recones Subwoofer Enclosure: 9.1cubes @ 32hz - brutal. Mids & Highs Amp: CT125.4 Active Components: Mids RE XXX 6.5c Highs - 3 RE XXX tweeters per side(A pillar) Noise Control: Damplifier Pro all over the cab. Build Log If you do business with me please leave feedback here: FEEDBACK THREAD Highest Legal Score: 151.0 db Highest Musical 30 Second Average: 151.6 db Link to comment Share on other sites More sharing options...
logspace Posted June 11, 2012 Author Report Share Posted June 11, 2012 I've never seen a box design like that. It looks really cool. Is this some type of ported enclosure? How does it work? Link to comment Share on other sites More sharing options...
Tarball Posted June 11, 2012 Report Share Posted June 11, 2012 It's basically a bandpass. The site calls it a baffled asymetrical blah blah blah. It is a neat design though. I used 3/4 hardwood ply and its very sturdy. After you make it you can adjust the tuning point in the car, then pull it out and lock the inner baffle in place. They suggest a couple of screws. I used epoxy all over the place. If you make one of these I recommend adjusting the internal dimensions to 12.5" I mad mine exactly 12" and had to later mod the inside of the box to accept the rubber gasket that comes on the subs. Also, use t-nuts for the speaker mount holes. I have eaten up the mount spot over the past 15 or so years...still have the box. CURRENT SYSTEM: Alternator: Stock alt on mids/highs Isolated DC Power 270 SP - Charging @ 16.8v Batteries: (2) XS D1400s Power Cable: Double Runs of 1/0 KNU Kolossus Fleks Headunit: 80-PRS Sub Amp: DC 5.0k Subwoofers: 2 RE MT 15s /PSI dual .7ohm recones Subwoofer Enclosure: 9.1cubes @ 32hz - brutal. Mids & Highs Amp: CT125.4 Active Components: Mids RE XXX 6.5c Highs - 3 RE XXX tweeters per side(A pillar) Noise Control: Damplifier Pro all over the cab. Build Log If you do business with me please leave feedback here: FEEDBACK THREAD Highest Legal Score: 151.0 db Highest Musical 30 Second Average: 151.6 db Link to comment Share on other sites More sharing options...
logspace Posted June 11, 2012 Author Report Share Posted June 11, 2012 Sounds good. But do you know the specs for a sealed box? Link to comment Share on other sites More sharing options...
05 obs Posted June 11, 2012 Report Share Posted June 11, 2012 If I remember correctly there is no recommended sealed enclosure. I have the same subs and I only remember ported specs for them. Link to comment Share on other sites More sharing options...
logspace Posted June 11, 2012 Author Report Share Posted June 11, 2012 Ah I see Link to comment Share on other sites More sharing options...
Joe X Posted June 12, 2012 Report Share Posted June 12, 2012 It has an EBP of 58 so it could be used on sealed, and Alpine in fact gives a spec for sealed, and that is 0.78 cubic feet of net internal volume. No one of the few that have tried (to my knowledge) has liked the results. You could be the first one though.. Link to comment Share on other sites More sharing options...
iceman1575 Posted June 12, 2012 Report Share Posted June 12, 2012 Any particular reason you want sealed? As in you're limited in space or something along those lines? It has an EBP of 58 so it could be used on sealed, and Alpine in fact gives a spec for sealed, and that is 0.78 cubic feet of net internal volume. No one of the few that have tried (to my knowledge) has liked the results. You could be the first one though.. Random fact, that was your 1,337th post. POTATO! Link to comment Share on other sites More sharing options...
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