OrionStang Posted May 27, 2015 Report Share Posted May 27, 2015 In my car, sealing off gains very little. One or two tenths. The sound and the air moved remains about the same, too. Trunk rattle is the only thing that improved with sealing off. My best trunk scores were forward firing with the box pushed all the way back, not sealed. Take it for what it is, but you really need to test different ways in YOUR car. SMD Super Seller My Feedback Thread Link to comment Share on other sites More sharing options...
Wood Posted May 27, 2015 Report Share Posted May 27, 2015 We sealed off tdsa23's Maxima trunk. Sound was much better and moved a lot more air. Not sure if "louder" since he never got back on the meter. But I liked it much more Did it feel louder at least? Sorry if I am thread jacking Deebeez, these questions will probably benefit you. I am currently in a build and I don't think my buddy is to happy. We were expecting to at least have some inner chest, slight pressure to the chest making it a tad fun to breathe. Although it does sound "clean," I felt like I wasted my time sealing off (especially damaging my trim panels with great stuff smh)... I have 4 layers of deadening on my trunk lid and double layer everywhere else from the rear deck back, secured the bottom of my license plate along with deadening behind it... ran 2k rms 6inches from the back of the trunk and still wasn't rattling... My experience with sealing off was it was too much work and not the performance I hoped for. My main concern was losing lows and in my vehicle I was tuned lower while sealing yet it couldn't hit the low notes with much authority as my rear fire setup which was tuned higher. Now don't get me wrong, 2k vs 4k is a huge difference when peak frequency is hit, but as far as low end, I lost it all when sealing :/ but that's my personal experience 2011 Nissan Altima aka Red Ruby HEADUNIT: Pioneer AVH X2700BS ELECTRICAL: -Singer 230a -Northstar gr34 -(2) Northstar SMS220 w/ Custom Terminals from 12V Metalworkz -100% Welding Cable FRONT STAGE:-(2 Sets) Hertz HSK165 -Hertz HSK130 -Ampere Audio 125.4 SUB STAGE: -(3) Sundown Audio SA REV2 12's -Ampere Audio 3800.1 V2 MISC (NON AUDIO RELATED): -Interior & Exterior Lights LED -Gloss Black Roof (PAINTED) -15% Front, 5% Rear Tint -Roof Spoiler -20" TSW Snettertons (20x8.5 front, 20x10 rear) -Custom Projector Retrofit (FX-R 3.0, 6.5k HID, Morimoto Mini H1 (faux projector), Quad Starry Night Halos) ----- COMING SOON!! -Aftermarket Fog Lights -Custom Painted Engine Covers My Build Log: http://www.stevemeadedesigns.com/board/topic/169869-woods-2011-altima-aka-red-ruby-new-video-more-updates/page-109 Retrofit Build Log: http://www.stevemeadedesigns.com/board/topic/185787-hid-projector-retrofitting-diy-by-wood/#entry2765346 Link to comment Share on other sites More sharing options...
BigManAC Posted May 27, 2015 Report Share Posted May 27, 2015 I didn't notice much of a db gain when I sealed the Saturn off, maybe .25 of a decibel which can win comps. However where I really noticed the difference was in the frequency response of the sub. Before it liked the lows but you couldn't really hear them and they were not "in your face". After I sealed it off my car loves the low end, around 26-29. I probably should do some bracing on my rear doors but idc that much about it. Every time people sit in it they say it moves some air for a single 15". I meter it but I built it for music. It has a nice little range, 25-40hz and it works perfectly for me. 2001 Saturn L200-Sony MEX-BT4100PFRONT STAGE:- (4) Crescendo PWX 6- Cadence XA250.2SUB STAGE:-Fi Audio BL 15 (Sealed Off)-Crescendo BC2kELECTRICAL:- Singer 240A alt - XS Power D3400- SkyHigh OFC power/speaker wire- Big 3 with SkyHigh 0gaugeBuild Log: Click HereScores: 146.5db @ 29hz Outlaw Link to comment Share on other sites More sharing options...
audiofanaticz Posted May 27, 2015 Report Share Posted May 27, 2015 some of the loudest trunk cars that compete are not sealed off, but they also are built around playing 1 frequency. Link to comment Share on other sites More sharing options...
reedal Posted May 27, 2015 Report Share Posted May 27, 2015 If i am wrong I hope someone will tell me, but I always thought it is louder when firing to the rear (towards the trunk, hatch, etc.) because the sound/air has something to load off of before it reaches your ears. Sealed off, it has to reach the windshield first, and there's more distance between the port and what it loads off of, so not as loud. Again, just what I have thought. Weld the trunk shut, fire into the trunk = no rattle and loud Boom. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
Mr DeeBeez Posted May 27, 2015 Author Report Share Posted May 27, 2015 Thanks for all the input! Don't worry about thread jacking, this thread was intended to be a discussion. How much of a difference between facing the cabin not sealed, vs sealed off? My box is in and facing cabin, I just haven't sealed it yet. Curious to know how much of an improvement that will be. Thanks for all the responses! Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
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