bigrob54865 Posted January 31, 2012 Report Share Posted January 31, 2012 Hey guys, A buddy and me are building a system in his 02 Trailblazer and it's been a slow process getting things together here and there as we can. It all started last spring when he said he wanted to put a sub in and I just happened to know another friend selling a HDC3-15 complete with box and amp. So he bought it and we got everything put in and went to our first MECA competition at lay'd out in the park in Morristown TN. Anyway we didnt compete that day but did get metered and did a surprising 141.5 on a MECA test tone. The set up then was JVC kd-r610 4 gauge wire factory battery under hood factory charging wires Quantam Audio QCA2000d class A/B amp rated at 2000 watts at 1 ohm but from what I have read was doing more like 700-750. 1 HDC3-15 D2 copper coils in approx. 4 cu. ft tuned to 36hz ( I believe) Since then we have done nothing but upgrade his blaze and these upgrades include: Xs power d3400 up front Xs power d3100 in rear Big 3 done 2 runs of 0 gauge to rear battery replaced quantum audio amp with audiopipe 15001d wired with 4 gauge direct from rear battery (approx 3 feet) replaced jvc headunit with jvc kw-avx738 double din dvd used edead sound deadener on rear plastic panel and filled back gate with great stuff windows and doors spray foam. The sub and box have not changed other than the box sits 1.5" higher than it did the first time we got metered. We went and got metered again this saturday and only did a 141.3. We were baffled by this because the system is noticably louder than it used to be and moves way more air and yet dbs went down? I was hoping someone on here may be able to tell me why this has happened? Quote Link to comment Share on other sites More sharing options...
carlosg_313 Posted January 31, 2012 Report Share Posted January 31, 2012 Maybe need more port area.....with 1 15 and 3.5k, I was at rising to 145 on music before my friends computer crashed on him >=[ Quote How do the Japanese feel about bass?You know that since 03/11/11 Progene? I just saw that stuff on CNN. They said it makes your junk shrink all up. lol.im pretty sure the op wont even notice if it gets even smaller. Refs - Pstone11, porksoda, coleman Link to comment Share on other sites More sharing options...
HatersGonnaHate Posted January 31, 2012 Report Share Posted January 31, 2012 What direction are the sub and port facing? I think the best results in an SUV are port back, sub up from what I hear. Quote My name is AdamThis is my Civic Build.7" Samsung Tab 2Kenwood KDC-X896Clarion EQS746Sundown X-15DC 3.5k @2ohmHatersGonnaHate's 02 Civic UBLELD Bypass for Honda Civic/Accord/FitDon's Jeep Grand Cherokee Rebuild N8ball2013 - i think you'd stick your dick in a blender if it told you it was 40 wtih two kids your age. lol srp365 - If posting were picking up bitches, I'd be going home single tonight looks like tony montana sneezed in your car. Link to comment Share on other sites More sharing options...
varietyguy Posted January 31, 2012 Report Share Posted January 31, 2012 (edited) Welcome to car audio!! Sometimes doing the right thing doesn't always work. Are all the variables the same as last? mic placement frequency tone, cd, usb, or aux? your new head unit might have a lower preout voltage and therefore you might look into a line driver. It's good that you upgraded your voltage, you definitely can run more power with no issue. But did you test your voltage before and after? one bad connection could hinder power substantially. Always test and then change one thing at a time, then test again. This will help more than you can imagine. Edited January 31, 2012 by varietyguy Quote 1992 Mazda 323 http://www.stevemead...323-wall-build/ Link to comment Share on other sites More sharing options...
AA98hoe Posted January 31, 2012 Report Share Posted January 31, 2012 The deadening could of lowered your peak freq... how are you metering? Stand. On what seat? I do stand on driver seat passenger door open... an how do you know what your peak is Quote 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. Link to comment Share on other sites More sharing options...
bigrob54865 Posted January 31, 2012 Author Report Share Posted January 31, 2012 (edited) sub and port back firing into the back gate. The new jvc double din has a higher pre out voltage, last time was done with a cd and this time it was done from an ipod via usb. Mic was placed according to MECA rules both times in the passenger seat. the first time it was metered it peaked at 42hz and from what ive read online this is the peak frequency for a trailblazer. only thing we noticed was that maybe the wrong test tone was used, he may have actually used a 44hz tone instead of a 42hz tone this last time it was metered. Edited January 31, 2012 by bigrob54865 Quote Link to comment Share on other sites More sharing options...
AA98hoe Posted January 31, 2012 Report Share Posted January 31, 2012 That's the problem I lose over a .5 a db from 37 to 38 hz... an it keeps getting worse the more I. Move from my peak.... like I said here's a trick put mike on drivers seat open passenger door... sweep for your peak again it mite be lower Quote 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. Link to comment Share on other sites More sharing options...
bigrob54865 Posted January 31, 2012 Author Report Share Posted January 31, 2012 Thanks we'll definitely have to try that and see if it has changed. Also, does anyone know of a shop or forum member near knoxville tn that has a TL? We went to Extreme Car Audio here in knox and were just really disappointed in the shop and the staff, so we're looking to go elsewhere Quote Link to comment Share on other sites More sharing options...
CJ18 Posted January 31, 2012 Report Share Posted January 31, 2012 What did you use to tune the amp? Also you may think that you upgraded amps, but audiopipe still isnt a very good brand of amp. You are better off going with a brand of amp that is known to do clean rated power. DC, Sundown, AudioQue, Rockford Power Series just to name a few. Quote Link to comment Share on other sites More sharing options...
Ray Posted January 31, 2012 Report Share Posted January 31, 2012 All back is how to do that truck How much port? I get 44-45 meca with single 15 and 2k in that truck Pics? Quote 2008 California state record holder 157.2 Bassrace2009 California state record holder 157.0 BassraceRollin 50's 158.7db2009 King of Cali Bassrace2009 USACi score 160.5 @ 42hz Link to comment Share on other sites More sharing options...
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