CarlosRodriguez Posted January 3, 2012 Report Share Posted January 3, 2012 hey everyone im try to decided on if i should be a 4th order box for my sundown sa-12's here are some specs on the box that i have drawn any input is appreciated Should I build it or not ?? its going to be a 1:2 chamber ratio rear is going to be 1.28 after displacements front is going to be 2.76 cf tuned to 36.09 box peaks at 33.79 at 6.69 db Quote Link to comment Share on other sites More sharing options...
SnowDrifter Posted January 3, 2012 Report Share Posted January 3, 2012 (edited) That seems like it is tuned waaaayyyy low and too small for a 4th order. Remember, it's not the same as a ported box. I'm not a bandpass pro, so I will wait for someone to suggest a tuning frequency, but it seems like mid-high 40s / low 50s is what most people tune at Edited January 3, 2012 by SnowDrifter Quote ~~~~~~~~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...
Jd1102 Posted January 3, 2012 Report Share Posted January 3, 2012 (edited) it looks a lil small to me also and the port looks huge and tuned kinda low also. i don't know alot about 4ths but from all i have seen never seen a port that big or tuned that low and id bet the sealed need to be larger and that would mean the ported would to but if im right and the ports to big that will free up some space and i also heard 40's to low 50s tunning edit: just taking a stab in the dark but prob at least 1.5 sealed be better at like 2 cubes prob and double that ported tuned to like mid 40s as i said just a stab in the dark Edited January 3, 2012 by Jd1102 Quote Link to comment Share on other sites More sharing options...
CarlosRodriguez Posted January 4, 2012 Author Report Share Posted January 4, 2012 i always thought it would have to be a 2:1 ratio but ive seen band pass online tunned to 40 hz range i can probably switch that part of the design now should i make the sealed part bigger? Quote Link to comment Share on other sites More sharing options...
Bmike Posted January 4, 2012 Report Share Posted January 4, 2012 (edited) yeah those subs recommend 1.00 ft^3 sealed -- F3 of 44 Hz* For SQ and space limited applications per sub, thats from the sundown sight, i have read here in the forums from more expert installers, that usauly they would have the sealed up side a little less than recommended,but 1.28 for both seems too small to me also as these fellas have pointed out, most are usually tuned in the 40s, thats all gonna be up to you in the end, my only advice would be to read more in depth, theres a ton of info in the subwoofer/enclosure section about 4th orders, the more you read the more you'll be able to figure out what will fit your needs.also theres alot of info on the whole ratio thing about spl /daily applications, happy reading Edited January 4, 2012 by Bmike Quote 2007 trailblazer lthead unit- pioneer p4300dvd crescendo ft-1 supertweeters pioneer m650 pros audiocontrol 2xs crossover Rockford fosgate p200-2 highsrockford fosgate p400-2 mids1- fi btl 18amps- saz 3500battery- evermax in front, 2 9a31 dekas in rearwires all knuconceptz 1/0 and rcas Link to comment Share on other sites More sharing options...
Bmike Posted January 4, 2012 Report Share Posted January 4, 2012 short cut to one of the read ups,http://www.stevemeadedesigns.com/board/topic/126478-basics-of-a-4th-order-bandpass-enclosure/ Quote 2007 trailblazer lthead unit- pioneer p4300dvd crescendo ft-1 supertweeters pioneer m650 pros audiocontrol 2xs crossover Rockford fosgate p200-2 highsrockford fosgate p400-2 mids1- fi btl 18amps- saz 3500battery- evermax in front, 2 9a31 dekas in rearwires all knuconceptz 1/0 and rcas Link to comment Share on other sites More sharing options...
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