SnowDrifter Posted November 23, 2011 Report Share Posted November 23, 2011 (edited) I have a 4.5 cubic foot box and I want to 'eat up' about a cubic foot of box volume to make it smaller / raise the tuning since I am swapping in a different sub and running more power to it. I was thinking a measured amount of expanding foam and fiberglass over the top of that? Ideas? Making a different box isn't really an option for me Here are pics of said box Edited November 23, 2011 by SnowDrifter Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
bassrace Posted November 23, 2011 Report Share Posted November 23, 2011 Your idea should work. Or you could just fiberglass huge rounded 45"s in the corners.. Quote 145.9@40hz 145.3@34hz big 3 X2 group 34 Deka Group 31 All 0/1 awg jl meta wire Alpine CDA 7894 Orion HCCA D5000 2 AQ HDC312's Crunch gpv1100.2 (for 6.5"s only) AQ pro audio 6.5" - 3 sets AQ supertweeters - 2 sets 2000 Slamry Link to comment Share on other sites More sharing options...
SnowDrifter Posted November 23, 2011 Author Report Share Posted November 23, 2011 (edited) Your idea should work. Or you could just fiberglass huge rounded 45"s in the corners.. I have ones in there already =( It would be kind of a pain in the behind / waste of fiberglass resin depending on how I do it Unless you know an easy way - which I am always open for Edited November 23, 2011 by SnowDrifter Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
bassrace Posted November 23, 2011 Report Share Posted November 23, 2011 Get some 8" concrete former tubes and cut in 1/3s or 1/4s to use as 45"s then glass over that.. Prob would save you alot of resin/mat Quote 145.9@40hz 145.3@34hz big 3 X2 group 34 Deka Group 31 All 0/1 awg jl meta wire Alpine CDA 7894 Orion HCCA D5000 2 AQ HDC312's Crunch gpv1100.2 (for 6.5"s only) AQ pro audio 6.5" - 3 sets AQ supertweeters - 2 sets 2000 Slamry Link to comment Share on other sites More sharing options...
Nine8SST Posted November 23, 2011 Report Share Posted November 23, 2011 If it was mine, I would cut the end of the box off and reattach the endcap. Whatever you spend on a can of paint to "touch up" is gonna be a hell of alot less than csm and resin. And if you cut it good enough there wont be much to touchup at all. Quote 1998 SS/T Ram Build Log - Kenwood KVT-514 and KNA-G510 Navigation - 2 DC Level 3 12" - Components??? - Sundown ??? - Sundown??? - Knu Konceptz - Second Skin Dampy Pro - XS D6500 Link to comment Share on other sites More sharing options...
Nine8SST Posted November 23, 2011 Report Share Posted November 23, 2011 Quote 1998 SS/T Ram Build Log - Kenwood KVT-514 and KNA-G510 Navigation - 2 DC Level 3 12" - Components??? - Sundown ??? - Sundown??? - Knu Konceptz - Second Skin Dampy Pro - XS D6500 Link to comment Share on other sites More sharing options...
Joe X Posted November 23, 2011 Report Share Posted November 23, 2011 A glued closed PVC pipe would reduce the effective internal volume and is reversible, changing the tuning is going to be harder, that's one of the upsides of airports. Quote Link to comment Share on other sites More sharing options...
loudNlow87 Posted November 23, 2011 Report Share Posted November 23, 2011 I don't know the dimensions of the box, but if possible, I would just make another wall on the port side where you have the 45's on the inner port wall. Pop it in through the sub cutout, glue it, screw it and seal it off. Like this if you can visualize. Quote '11 Jeep Patriot New Build Head Unit: Pioneer AVH-P3200DVD Front: Massive CK69 Components Front Amp: Massive NX2 Rears: Infinity Kappa's Subs: 8 Sundown SA-8 v2's Sub Amp: AB 450.1 XS D3100 Come on 150! Link to comment Share on other sites More sharing options...
SnowDrifter Posted November 26, 2011 Author Report Share Posted November 26, 2011 Let me know what you think of this. 6"x15.5" section of PVC pipe glued into some MDF to hold it - 1 flush end Put an end cap on the open end, then velcro the end with the MDF and a spot in my box to hold it. To take reduce the box size to 3.5 cubic feet and bring the tuning to 30hz - put the pipe in. To bring it back to 4.5 cubes and 26 hz tuning - remove pipe Thoughts? Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Joe X Posted November 26, 2011 Report Share Posted November 26, 2011 The PVC pipe can stay inside with one cap to each end no need for it to come out, obviously the reduced Vb will increase tuning frequency, you can just keep taking up more Vb until you get the 30Hz. If you have the full dims of the port (cross-sectional area and centerline lenght) I could better estimate or you can do it if you know the equation. Quote Link to comment Share on other sites More sharing options...
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