412 CVX Posted January 19, 2012 Report Share Posted January 19, 2012 So i'm pretty sure most of y'all saw my other thread where i was practicing my 4th order skillzzz (or lack there of). Unfortunately, the thread didn't quite go as i'd hoped lol. turned into a "do mine next" instead of a "try this next time" thread. guess i could have predicted that part anyways i'm going to put the charity work on hold for the time being so i can get some critique and maybe learn a thing or two. so yeah, feedback, critiqe, admire, yadda yadda. box 1: DC level 4 15. 2:1 ratio, 18"h,24"w,44"l (minus the port), 52hz tuning, port is 12.5" wide, 7 inches tall, 9 inches long. now i'm 90% sure this box will have loading issues, i didn't think about that when i made it; but hopefully someone can explain to me the theory behind this. is it because the front wave doesn't really have time to reverberate? explain? Sketchup link. Box 2: 4 Fi Q 12's, 2:1 ratio, 14.5"h x 38"w x 55"l (minus 4" external port), 45hz tuning, port is 8"h x 16"w x 11"l. sketchup link 2 Box 4: 3 sundown z v.3 12's, 2:1 ratio, external dimensions 32.25w x 20.0h x 36.0d, tuned to 52 hz, port is 18.5 high, 5.5 wide, 6 deep. there's a place for a little lexan window to see the inside of the enclosure for aesthetic reasons, and/or to access the subs if need be. sketchup link 4 Box 5: 2 DC level 4 12's. bout a 1:1.5 ratio. 15h x 36w x 27d without external port. one has a slot port, one has an 8 inch tube, both tuned to about 48 hz. the sealed portion is basically a 30x60x90 triangle. sketchup link 5 while we're at it, does someone want to explain some theories on how 4th orders work? more specifically, what does the tuning mean for the cutoff frequency? and does it peak at that frequency? and lastly how can one tell how a 4th will handle and play the lower frequencies? Quote Just say no to Ground Pounder Customs. My temp system build log More box buildssome cars do over 170db with one sub, so clearly my two 12"s can do that in my car, with my knowledge too! look out bitches! I'm with captain stupid. Link to comment Share on other sites More sharing options...
FroznBeavrBALLs Posted January 19, 2012 Report Share Posted January 19, 2012 Box 5: 2 DC level 4 12's. bout a 1:1.5 ratio. 15h x 36w x 27d without external port. one has a slot port, one has an 8 inch tube, both tuned to about 48 hz. the sealed portion is basically a 30x60x90 triangle. oh snap! that thing looks like a beast! haha Yeah i thought there would be some loading issues. I cant explain why. lol... only because DUDEWITH4X4 blew a sub i think because of a box just like that. Idk how it works though. I will keep this drawing in hand just incase i want to use it thanks man. surprise you didnt put a window in it like we were talking about in the PMs. hahahaha Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
BassJunkie Posted January 19, 2012 Report Share Posted January 19, 2012 Looks pretty good but forget all about ratios imo. Also I agree the first box will have loading issues, you're firing right at a port vs loading off of something. My 2 cents, I have a 4th order wall but I'm far from a 4th order pro. Quote 1986 C20 Suburban 9 American Bass XFL 15's B2 M1MKII 14v XS Power Batteries Maxwell Caps Acoustical energy is free. Electrical energy is not you havent lived until you've hit a screw with a router. Link to comment Share on other sites More sharing options...
412 CVX Posted January 19, 2012 Author Report Share Posted January 19, 2012 I will keep this drawing in hand just incase i want to use it thanks man. surprise you didnt put a window in it like we were talking about in the PMs. hahahaha I could put a window on the top if you gave me an extra quarter inch of height to work with lol Quote Just say no to Ground Pounder Customs. My temp system build log More box buildssome cars do over 170db with one sub, so clearly my two 12"s can do that in my car, with my knowledge too! look out bitches! I'm with captain stupid. Link to comment Share on other sites More sharing options...
Jd1102 Posted January 19, 2012 Report Share Posted January 19, 2012 (edited) Looks pretty good but forget all about ratios imo. Also I agree the first box will have loading issues, you're firing right at a port vs loading off of something. My 2 cents, I have a 4th order wall but I'm far from a 4th order pro. why do you say forget about the ratios? i thought that was the key to 4ths im also trying to learn. edit: and to op from what i have learned i also agree about the loading issue others look nice Edited January 19, 2012 by Jd1102 Quote Link to comment Share on other sites More sharing options...
FroznBeavrBALLs Posted January 19, 2012 Report Share Posted January 19, 2012 I will keep this drawing in hand just incase i want to use it thanks man. surprise you didnt put a window in it like we were talking about in the PMs. hahahaha I could put a window on the top if you gave me an extra quarter inch of height to work with lol Oh well thats way too much space i cant fit that in there. lol... Quote 2 DC 12" lvl 4s 1 DC 1.2k XS Power S3400 big 3 Alll KNU wire Pioneer HU cheapo Legacy coaxes (just for now) http://www.stevemead...n-sentra-build/ Link to comment Share on other sites More sharing options...
Smoove Posted January 19, 2012 Report Share Posted January 19, 2012 If you can all of these tuned right. These box designs are badass. Quote 2 Team Fi 15's v1 2 DD M5's 970amps of Alt 6th order blowthroughThe truck Blowthrough build : http://www.stevemeadedesigns.com/board/topic/155555-smooves-1996-chevy-ext-cab-c1500-slow-build/The 350z build : http://www.stevemeadedesigns.com/board/topic/170694-smooves-2003-nissan-350z/ My FB page https://www.facebook.com/pages/Smooves-Car-Audio-and-performance/719746144805343 Team Fi Audio http://www.ficaraudio.com/ Link to comment Share on other sites More sharing options...
99fullsizechevy Posted January 19, 2012 Report Share Posted January 19, 2012 I would love to know this as well, I recently built a 4th order similar to the first one in question and for the time being it seems to be working quite well and as far as I can tell there aren't any loading issues.. But I may be wrong.. Quote Laying frame soon.. System has to wait Link to comment Share on other sites More sharing options...
Jd1102 Posted January 19, 2012 Report Share Posted January 19, 2012 and also on the one we see the loading issue with couldn't you just tilt the sub at an angle to fix that? like as in load off the top of the box? Quote Link to comment Share on other sites More sharing options...
SnowDrifter Posted January 19, 2012 Report Share Posted January 19, 2012 Looks pretty good but forget all about ratios imo. Also I agree the first box will have loading issues, you're firing right at a port vs loading off of something. My 2 cents, I have a 4th order wall but I'm far from a 4th order pro. Not to thread jack... But could you explain this one to me? 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...
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