JuniorXJ Posted November 21, 2013 Report Share Posted November 21, 2013 new to the forum but been into car audio for the last 10 year but never got into the box build but im looking to build a better box than the prefabed peice of crap i have now. ive done some reading and i looks like i should have a box with 2.5 tuned to 32hz , thats where i get confused. i have put info into a few online calc and they have just added to the confusion. im good with tools, numbers not so much so i need some help. the setup 98 Jeep cherokee 4 door 12" Alpine Type X crappy kenwood amp pushing 500w rms (looking to upgrade soon to at least 1000w rms) pioneer avh-p4300dvd max demensions 40W x 22D x 18.5H i could go up in height bt would like to keep it even with top of back seat sub up and port back 1998 Jeep Cherokee Headunit: Alpine CDE-143BTEq: NVX XEQ7Front stage: Boston Acoustic 6.5 Component setRear stage : RemovedMid/High Amp : Pioneer GM-X364 70x2 bridgedSubwoofer: Fi BL 18" Dual 2 wired @ 1ohmSub Amp: CT Sounds 1400.1d Build: http://www.stevemeadedesigns.com/board/topic/180586-juniorxjs-98-cherokee-build/ Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 21, 2013 Report Share Posted November 21, 2013 Good first post, you gave all the information we need all at once, which folks almost never do. I'll work up a design for you today or tomorrow, you should have enough space for what you want to do. "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: Link to comment Share on other sites More sharing options...
Krakin Posted November 21, 2013 Report Share Posted November 21, 2013 A net volume of 1.5 cubes (after sub, port, and bracing displacements) (1) 6" aeroport at 38" will get you around 35hz tuning. 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...
Mr H Posted November 21, 2013 Report Share Posted November 21, 2013 I've lost my touch on box building, even with Subwoofer Design Toolbox. It's freaking all confusing now (maybe its the age)... lol. This box for example, http://www.stevemeadedesigns.com/board/topic/141-ported-box-2-mtx-9515s-repost-for-my-site/ how is something like this even calculated? Given how the ports are being shared. As for tuning, is it tuned for 30Hz @ 2.80cuft? I got the specs from http://www.manualslib.com/manual/293713/Mtx-Thunder-T9515-04.html Can anyone get me back into speed? Link to comment Share on other sites More sharing options...
Krakin Posted November 21, 2013 Report Share Posted November 21, 2013 I've lost my touch on box building, even with Subwoofer Design Toolbox. It's freaking all confusing now (maybe its the age)... lol. This box for example, http://www.stevemeadedesigns.com/board/topic/141-ported-box-2-mtx-9515s-repost-for-my-site/ how is something like this even calculated? Given how the ports are being shared. As for tuning, is it tuned for 30Hz @ 2.80cuft? I got the specs from http://www.manualslib.com/manual/293713/Mtx-Thunder-T9515-04.html Can anyone get me back into speed? You calculate the volume of the box as a single chamber. When designing a 2 common wall port like that you split the port in half at the back wall, so that half of the port area goes to each driver. Being that the port shares two walls with the shell of the enclosure you need to account for that (Torres will if you select it). You can refer to this thread for some more info. http://www.stevemeadedesigns.com/board/topic/178345-calculating-port-area-with-xmax/ 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...
Triticum Agricolam Posted November 21, 2013 Report Share Posted November 21, 2013 I forgot to ask but did you want this box to have 2.5 cubes net total or per driver? Bonus points for driving an XJ. :-) "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: Link to comment Share on other sites More sharing options...
Krakin Posted November 21, 2013 Report Share Posted November 21, 2013 I forgot to ask but did you want this box to have 2.5 cubes net total or per driver? Bonus points for driving an XJ. :-) I don't see where he says there is more than one driver, unless I just don't see it, and 2.5 cubes is a lot past the manufactures recommended specifications. Regardless my suggestion is for a single Type X 12". 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...
Joe X Posted November 22, 2013 Report Share Posted November 22, 2013 Could be done like this for a single SWX1243, subsonic filter to 28Hz: Port parts: Front to Back: 14 3/4" x 12 3/4"Extension: 16" x 12 3/4" Link to comment Share on other sites More sharing options...
JuniorXJ Posted November 22, 2013 Author Report Share Posted November 22, 2013 Thanks for the responses , it's a single 12" and I know the manufactures spec say a lot less but I was surfing around the web and have seen a few post said 2.5 would be better for this but I'm not sure ( not sure if they were talking 2.5 gross or 2.5 net ) Alpine recommends gross 1.8 And 1.15 net , 1998 Jeep Cherokee Headunit: Alpine CDE-143BTEq: NVX XEQ7Front stage: Boston Acoustic 6.5 Component setRear stage : RemovedMid/High Amp : Pioneer GM-X364 70x2 bridgedSubwoofer: Fi BL 18" Dual 2 wired @ 1ohmSub Amp: CT Sounds 1400.1d Build: http://www.stevemeadedesigns.com/board/topic/180586-juniorxjs-98-cherokee-build/ Link to comment Share on other sites More sharing options...
Krakin Posted November 22, 2013 Report Share Posted November 22, 2013 You can take my net volume with a grain of salt as I have no experience with what these like volume wise. 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...
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