bman8891 Posted December 8, 2015 Report Posted December 8, 2015 2 xl12's saz 3500d at .5 2.9 net box (1) 6" aero So just like the title says when the cabin is sealed the subs unload, even if only one window is down they unload. Both windows have to be down for the subs to play well. When sealed if its a solid bass tone the subs play fine for like 2 seconds then when there's too much pressure they unload. Im aware I dont have enough port (triticum warned me of this) but this is the best I can do with size restraints. So my theory is its acting like a leaky sealed box and when the windows are up the air cant escape and builds up way too much pressure causing the subs to freak out. Any thoughts on this?
ToNasty Posted December 8, 2015 Report Posted December 8, 2015 I don't think you meen unload. Do you meen just not as loud? My silverado is quiet as hell sealed.up. window or Windows down it wakes up ***Super Sellers List***http://www.stevemeadedesigns.com/board/topic/25829-super-sellers-buyers
n8ball2013 Posted December 8, 2015 Report Posted December 8, 2015 Yeah I don't think your terminology is right. THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger.
daimer Posted December 8, 2015 Report Posted December 8, 2015 I also have issues when my cabin is sealed up - the sub begins to move more on some notes. And, of course, it's much quieter. My humble build log: http://www.stevemeadedesigns.com/board/topic/192602-corsa-b-daily-build-with-12-ground-zero-new-box-in/ Single Zv4 Rev.2 15" on a 10k amp: http://www.stevemeadedesigns.com/board/topic/201434-my-reviewtest-of-the-zv4-rev2-15/
bman8891 Posted December 8, 2015 Author Report Posted December 8, 2015 No I definitely mean unload. Of course its way more quiet but the subs bottom out/reach mechanical limit/unload/sounds like they're coming apart.
AA98hoe Posted December 8, 2015 Report Posted December 8, 2015 Pics of box vehicle etc TEAM DC AUDIO VEHICLE:98 chevy tahoe 2wd 3-4 drop HEADUNIT:alpine 9886 PREAMP:arcaudio FRONT STAGE:4-6 1/2s selinium,DD component set and 4-selinium tweeters in each door KICKPANELS:jl audio 5 1/4 REAR DOORS: dd components 6 1/2s HIGHS AMPS:zapco 750.2 on front doors,zapco an another 750.2 on kicks and rear doors SUBS:4-ascendant audio 18s with 5 spiders in a custom box built by KINGSUV SUB AMP: 2-dc7.5s ALTERNATORS: 3-mechmans 1- 425comp, 1-smd spec350, 1-270 with adj voltage harness on custom dc bracket WIRE:10-runs 0g front to back BATTERIES:6-d1400s TL results:157.1 at 38hz and 156.8 at headrest score @37hz. STATE AND NATIONAL RECORD IN MECA S5.
juan777 Posted December 8, 2015 Report Posted December 8, 2015 Show box pics, maybe a video showing what happens. The L@zy Hoe 2005 Chevy Tahoe 2,500 Watts of Highs/Mids 4 10 midrange 4 6.5 midwoofers 4 Tweeters 6 Supertweeters 2 Lithium 80AH Batteries 24K Watts 4 Custom 18s Quad alt setup Rebuilt 250amp and 3 370s Interior work by Lone Star Auto Works The Build Log Like Loud Bass? Click Here! On 12/5/2014 at 8:06 PM, juan777 said: See yall there, I'll be the drunk Mexican with aviators on. On 12/6/2014 at 10:32 PM, boom50cal said: I did see Juan LMFAO! He REALLY WAS the drunk mexican with Aviators on!
Triticum Agricolam Posted December 8, 2015 Report Posted December 8, 2015 Car acoustics can do funky stuff Here is one possible explanation, when you get port compression your excursion goes up. With everything sealed up your port could be compressing badly and that could be causing what you are experiencing. When you roll the windows down or move the sub it might be changing the tuning (lowering it I suspect) enough that you don't get as much compression. You could check your tuning by looking at what frequency the cone moves the least. Try it at a moderate sound level with the windows up and windows down and see if there is a difference. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
MADVIBES Posted December 8, 2015 Report Posted December 8, 2015 I think port is way too big for a box that size, I have a theory about the woofer control with the windows down, with the windows down its acting a like a 6th order series, basically one ported rear chamber firing into a front ported enclosure, with the windows up it behaves like a small box with too much port area. DB DRAG PSYCHLONE PRO 156.3 30 SECOND AVERAGE FO MAX AT 26HZ LEGAL DASH DRIVER DOOR OPEN 158.0@30 HZ MY BEST SO FAR, HOPEFULLY A 160 COME FEBUARY. 156.9@26hz 158.0@30hz
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