DynamikT Posted February 5, 2014 Report Share Posted February 5, 2014 I have 2 power acoustic mofo 12's in a 3.9 cubic box.. I can see them both move alot but hardly any volume is coming out of them? When i just have one hooked up it sounds MUCH louder than both of them, ive done the wiring correct, my amplifier is underpowering them but even so when they are moving this much, i know it should be alot louder. Below are my box specs... I read somewhere there is a possibility of a box being too small so then a push/pull config has to be done where one sub is flipped, is this my only solution in this particular box? Thanks. Link to comment Share on other sites More sharing options...
SnowDrifter Posted February 5, 2014 Report Share Posted February 5, 2014 Sounds like one of then is out of phase ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
dangaranga Posted February 5, 2014 Report Share Posted February 5, 2014 Sounds like one of then is out of phase What he said, swap the pos and neg on one of the subs Brandon 2000 Furd Ranger supercab 4x4 System: welding wire throughout the truck USalts 390amp Hairpin Juicebox in stock location 8 Banks of maxwell supercaps 2 American Bass Vfl 1100.1 wired to .35 each 2 Fi Audio Sp4 18's ( the DD sc 9918's smoked) Pioneer radio with Soundstream PA mids Powered by a nice sized soundstream 2 channel It's pronounced (dain-ja rain-ja) 2001 2 door focus 1 DD9918 SC Link to comment Share on other sites More sharing options...
DynamikT Posted February 5, 2014 Author Report Share Posted February 5, 2014 update: Problem solved, thanks again. i cant seem to find an explanation on the internet on why this happens / out of phase situation though? if someone can mention, would be great. they are both dual 2 ohm subs wired as 4 ohm each. Link to comment Share on other sites More sharing options...
TRON Posted February 5, 2014 Report Share Posted February 5, 2014 The port area may also be to large. Even though the enclosure is "tuned" to 30 hz, if the port isnt the proper size according to the drivers, such problems will arise. Aviod enclosure calculators that dont take the driver into its calcualtions. Also, what kind of amplfier do you have? Avalanche Alpine Type S comps Alpine Type S 10'' Alpine MPR-F300 Alpine MRX-M50 Mechamn 270 XS Power d3400s Link to comment Share on other sites More sharing options...
SICKSPD Posted February 5, 2014 Report Share Posted February 5, 2014 move the port 09 Challenger R/T (Audio system under construction): Pioneer AVH-X4500BT (PAC RP4CH11 harness) (2) Sundown Audio SA-8v2 (inverted) CT Sounds AT1400.1D XS Power D3400 40 sq ft. Audiotechnix deadener 1/0 Audiotechnix wiring stock Boston Acoustic 7 speaker amplified system (for now) Sealed trunk enclosure Build log: http://www.stevemeadedesigns.com/board/topic/178399-slammed-dodge-challenger-sundownct-sounds-build/ TEAM GOAT Link to comment Share on other sites More sharing options...
Amart88 Posted February 5, 2014 Report Share Posted February 5, 2014 move the port lo........................l My 2005 s10 blazer build. 4 zcon 18's walled. Link to comment Share on other sites More sharing options...
Krakin Posted February 5, 2014 Report Share Posted February 5, 2014 The port area may also be to large. Even though the enclosure is "tuned" to 30 hz, if the port isnt the proper size according to the drivers, such problems will arise. Aviod enclosure calculators that dont take the driver into its calcualtions. Also, what kind of amplfier do you have? While the needed port area for the subs should be 49 in2 at 30hz, having 36 inches will increase velocity of the air. OP if you are not having air flow, then you most likely have one of the subwoofers wired backwards causing the phases to be 180 degrees away from each other. This means that when one subwoofer has the cone being pushed outwards the other is being pushed in, causing the pressure to be canceled out. I noticed you said "push/pull" configuration in the beginning, this would be wiring out of phase. You need both of the cones to be moving in the same direction at the same time. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
hecta187 Posted February 6, 2014 Report Share Posted February 6, 2014 Ive actually made a box for these exact woofers I gave them 2 cuft each after all displacements but I gave them 64 sq of port area they loved it kicker u lite app on your phone shows wiring diagrams to help asks what coils are on the woofer/s and what resistance you need to the amp CAR AUDIO JUNKIE Link to comment Share on other sites More sharing options...
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