stipek Posted August 24, 2011 Report Share Posted August 24, 2011 Don't know how useful this information is but everyone ask how much of an output you gain from a ported enclosure vs a sealed one. Although these numbers don't directly relate to db's I recently switched out my sealed box for a ported one. All other equipment and settings remained the same so no other variables affected the test. Interpret them as you may. This is 2 MTX TR7512 on a MTX JH600 amp. (volume was not at absolute max clean because tones were at 0 db and I set the gains with a scope using a -4.6 db tone and did not want to reset them so I just turned the volume down a couple ticks) Quote Headunit - Sony DSX-200X Subs - (2) Modified American Bass 18's Monoamp - DD M4 Front Stage - CDT HD62-AS components with 4 Crescendo PWX 6.5 4 Channel Amp - Hifonics ZRX1000.4 Cadence 0 gauge Singer 275 amp Alt D7500 XS Power battery Quad 1/0 input Toolmaker terminals SMD OM-1 RGB LEDs BUILD LOG CURRENT ABOVE SETUP http://www.stevemeadedesigns.com/board/topic/191602-2003-bravada-2-18s-ab-dd-xs-singer/ BUILD LOG (2 MTX 7512's)http://www.stevemead...__fromsearch__1[/size] Link to comment Share on other sites More sharing options...
optical Posted August 24, 2011 Report Share Posted August 24, 2011 so does this mean that your cabin peak is 45 hz? Quote Link to comment Share on other sites More sharing options...
fritosaregood Posted August 24, 2011 Report Share Posted August 24, 2011 box is tuned around 45hz Quote seller feedback: http://www.stevemeadedesigns.com/board/ind...showtopic=61719 http://www.stevemeadedesigns.com/board/ind...showtopic=68281 build log: http://www.stevemeadedesigns.com/board/index.php?showtopic=44800 Gf's build: http://www.stevemeadedesigns.com/board/topic/54346-kickergirls-camaro-new-box-pg-5/#entry753970 Link to comment Share on other sites More sharing options...
optical Posted August 24, 2011 Report Share Posted August 24, 2011 so where as the box is tuned you experience the most rise in a ported box? Quote Link to comment Share on other sites More sharing options...
Guest Posted August 24, 2011 Report Share Posted August 24, 2011 so where as the box is tuned you experience the most rise in a ported box? yes sir. impedance rise is highest around box tuning (for ported boxes of course) Quote Link to comment Share on other sites More sharing options...
Tarball Posted August 24, 2011 Report Share Posted August 24, 2011 What is the DB output at these various points? That is what you really want to know to answer the outpout gain question. This is intersting data though and can probably more accurately speak to the effiencies of sealed vs ported at the various freqs. Quote CURRENT SYSTEM: Alternator: Stock alt on mids/highs Isolated DC Power 270 SP - Charging @ 16.8v Batteries: (2) XS D1400s Power Cable: Double Runs of 1/0 KNU Kolossus Fleks Headunit: 80-PRS Sub Amp: DC 5.0k Subwoofers: 2 RE MT 15s /PSI dual .7ohm recones Subwoofer Enclosure: 9.1cubes @ 32hz - brutal. Mids & Highs Amp: CT125.4 Active Components: Mids RE XXX 6.5c Highs - 3 RE XXX tweeters per side(A pillar) Noise Control: Damplifier Pro all over the cab. Build Log If you do business with me please leave feedback here: FEEDBACK THREAD Highest Legal Score: 151.0 db Highest Musical 30 Second Average: 151.6 db Link to comment Share on other sites More sharing options...
bromo Posted August 24, 2011 Report Share Posted August 24, 2011 so where as the box is tuned you experience the most rise in a ported box? yes sir. impedance rise is highest around box tuning (for ported boxes of course) No, in a ported enclosure you will have two impedance peaks and the tuning frequency is in between them. Like this one would be tuned to ~31hz. Quote Link to comment Share on other sites More sharing options...
stipek Posted August 25, 2011 Author Report Share Posted August 25, 2011 What is the DB output at these various points? That is what you really want to know to answer the outpout gain question. This is intersting data though and can probably more accurately speak to the effiencies of sealed vs ported at the various freqs. Wish I had a meter...I would do that for sure cuz as you said that is what would be more interesting is the db's. Quote Headunit - Sony DSX-200X Subs - (2) Modified American Bass 18's Monoamp - DD M4 Front Stage - CDT HD62-AS components with 4 Crescendo PWX 6.5 4 Channel Amp - Hifonics ZRX1000.4 Cadence 0 gauge Singer 275 amp Alt D7500 XS Power battery Quad 1/0 input Toolmaker terminals SMD OM-1 RGB LEDs BUILD LOG CURRENT ABOVE SETUP http://www.stevemeadedesigns.com/board/topic/191602-2003-bravada-2-18s-ab-dd-xs-singer/ BUILD LOG (2 MTX 7512's)http://www.stevemead...__fromsearch__1[/size] Link to comment Share on other sites More sharing options...
teamace24 Posted August 25, 2011 Report Share Posted August 25, 2011 How louder was it to the ear? Quote 1st Setup(SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 Audioque SDC2.5 15 subs8.7 cubes at 37hz build DONEAudioque 1200d (Audioque 1200d Sold, similar performance to my ap1500)Diamond Audio Hex 6.5 Mids n TweetsCerwin Vega Exl 400 4 channel Bridged(also have MTX 4004 not being used)1 Run of power Knu Fleks 4 Gauge2 Cheap stock Battery setup2nd Setup (SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 15 Kicker cvx (maybe two SA 15 in future)7 cubes net tuned at 34hzAlphasonik Old school 1600rms (ap 1500d sold GREAT Budget amp)JBL 6.5 Power Series Components, Infinity Kappa 6.5 3 ways, and 2 Kicker KS Tweets (LOUD)Cerwin vega exl4001 run knu Fleks OFC 0 gaugeBig 3 done1 Odyssey 1500, 1 optima yellow top d31 Link to comment Share on other sites More sharing options...
stipek Posted August 25, 2011 Author Report Share Posted August 25, 2011 so where as the box is tuned you experience the most rise in a ported box? yes sir. impedance rise is highest around box tuning (for ported boxes of course) No, in a ported enclosure you will have two impedance peaks and the tuning frequency is in between them. Like this one would be tuned to ~31hz. This ported box is calculated to have 33 hz tuning but with the kerfed port there is no hard fact as to how much is effective port so that figure may be off just slightly... I used 1/2 the length. Also ported boxes peak usually 5-10 hz above the tuning freq. I have yet to get metered to see what the peak freq of vehicle or more so this "system" is. From listening to it I'm guessing around 45 Hz. Have had some say resonance freq of this vehicle is around that 45-48 Hz range. 2003 Bravada. Quote Headunit - Sony DSX-200X Subs - (2) Modified American Bass 18's Monoamp - DD M4 Front Stage - CDT HD62-AS components with 4 Crescendo PWX 6.5 4 Channel Amp - Hifonics ZRX1000.4 Cadence 0 gauge Singer 275 amp Alt D7500 XS Power battery Quad 1/0 input Toolmaker terminals SMD OM-1 RGB LEDs BUILD LOG CURRENT ABOVE SETUP http://www.stevemeadedesigns.com/board/topic/191602-2003-bravada-2-18s-ab-dd-xs-singer/ BUILD LOG (2 MTX 7512's)http://www.stevemead...__fromsearch__1[/size] Link to comment Share on other sites More sharing options...
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