varietyguy Posted December 11, 2011 Report Share Posted December 11, 2011 I just finished my wall and I am fairly happy with it except for one thing. With the car doors open it is pretty loud (haven't metered yet.) but with the doors shut it is substantially quieter. If I were to guesstimate I would say between 5-7 db difference. My dash and everything in the car shakes with the doors open but sealed not too much is going on. I know that it has to do with frequency and box design. But how can I retain the pressure with the doors shut? Quote 1992 Mazda 323 http://www.stevemead...323-wall-build/ Link to comment Share on other sites More sharing options...
SoCaLBaMF Posted December 11, 2011 Report Share Posted December 11, 2011 Sometimes 4th order and 6th order bandpasses act differently than normal ported boxes. Some are louder sealed on the lows, and louder with the doors open in the higher frequencies. Maybe try one of those boxes and see how you like it Quote 2004 Bagged Trailblazer (4)18" Sundown Nsv3s (4) Taramps HD10000s, Taramps DSP3000, Lanzar opti 250x2, AB 100x4 (2)DC power SP 270s, (14)XS Power d3100s, (1)d6500 Link to comment Share on other sites More sharing options...
nbshazeezee Posted December 11, 2011 Report Share Posted December 11, 2011 whats your setup? Quote Ye dig, getting loud off little (2) AQ HDC3 12 AQ 2200D - Replaced it, Works great AQ4x90 JBL 662s 2 ways (2)XS 5100r under the hood & A 170amp alt Link to comment Share on other sites More sharing options...
varietyguy Posted December 11, 2011 Author Report Share Posted December 11, 2011 2 ascendant mayhem 15s on 2 saz 3000d, walled in 9 cubes tuned to 36 Hz with 110 in of port Quote 1992 Mazda 323 http://www.stevemead...323-wall-build/ Link to comment Share on other sites More sharing options...
loudNlow87 Posted December 11, 2011 Report Share Posted December 11, 2011 Not all vehicles do it, but it's a gain in transfer function. You're basically turning your vehicle into a big bandpass enclosure. With the door open, your car's no longer 'pressurized' as it was sealed. Less pressure = more cone movement = more air being moved. 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...
varietyguy Posted December 11, 2011 Author Report Share Posted December 11, 2011 So if I do a bigger enclosure will this help or hurt me? Same with port? Quote 1992 Mazda 323 http://www.stevemead...323-wall-build/ Link to comment Share on other sites More sharing options...
412 CVX Posted December 11, 2011 Report Share Posted December 11, 2011 it's trial and error. that's the nature of the beast. Quote Just say no to Ground Pounder Customs. My temp system build log More box buildssome cars do over 170db with one sub, so clearly my two 12"s can do that in my car, with my knowledge too! look out bitches! I'm with captain stupid. Link to comment Share on other sites More sharing options...
loudNlow87 Posted December 11, 2011 Report Share Posted December 11, 2011 So if I do a bigger enclosure will this help or hurt me? Same with port? Not saying you made a bad wall. It's just the acoustical characteristics of your car. By opening the door or crackin' a window you have just created a second tuned enclosure. Pressure should be greatest at the opposing side of the open door/window. 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...
varietyguy Posted December 11, 2011 Author Report Share Posted December 11, 2011 Ok. I understand. Ive never had a system that had this much difference between sealed and ported. I didn't know if I did something wrong or what. Thanks guys. Quote 1992 Mazda 323 http://www.stevemead...323-wall-build/ Link to comment Share on other sites More sharing options...
stevo2deep Posted December 11, 2011 Report Share Posted December 11, 2011 The spice of life. . . LOL That's what keeps it interesting Part of what I love about this hobby is just how much a vehicle/box/equipment can distinguish itself and keep things VERY INTERESTINTG Just keep keepin on playin wittit and thanks for sharing your results Quote no you're a towell 99 Isuzu Vehicross FTW DC 5K (would like to be 7.5K) DC 350.4 (2X) SOLOX 18s WALL 17 CUBES (3X) XS D3100'S REAR / (1X) D3400 FRONT Kenwood Excelon flip-out w/rear view and navi Singer Alt FTW TOO LAZY TO LOG BUILD, MAYBE TOMORROW Link to comment Share on other sites More sharing options...
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