terra

my spare tire is under the car..and the jack is mounted in a side panel. and my box isnt ported so theres no tuning frequency to change. also the net volume is about 2.8 cu ft bigger than it needs to be so i have room...

so in the box is a no go? any reason why? and maybe in the footspace behind the driver seat...

yes i do. 4 MJ-18's. now answers to the question?

i just ordered 4 MJ's for my explorer..running at 1 ohm off a modded HK4000D. probably at 2800rms. sealed at first but ill be building a ported box at the same time. ill use the ported box for special occasions but its too big to be practical for every day considering im aiming for 17 cu ft net so like...22 cu ft gross. ill keep pics

mines like 12.5 cu ft for 2 MJ's. tuned to 35hz. giving them about 680 rms each

Im waiting on that 20" you proposed a while back...any updates?

im pretty sure its feasible..i think you should definitly do it id definitly be down for 2 the second you build it. how about a limited production run?

thanks for the help..wish i could get winISD on here but no luck. ill be finishing it up tomorrow and ill have pics

OK im building my box at 12 cu ft tuned to 31 hz. 41x20x30 roughly 192 sq in of port area...port back subs up. port going along the bottom width 39 inches wide and 5 inches tall with a kerfed port. i get a port length of 14.54 inches. correct or i done screwed up?

wait so for 32hz..a port 6.25 tall is longer than one 5 in high and one thats 8 inches high? how does that work out?

hey mike would u mind doing those 3 frequncies again but for a port height of 6.25 inches? lol dont ask how that happened because i honestly dont know. and im starting at 14.c cu ft so is it reasonable that after port, sub and brace displacement id be at 12.3? or would net be lower?

well that pretty much figured everything out for me...but if the port has to climb the back wall and the subs facing up, will i see any negative effects from the subs playing into the port?

ok right now i have 2 options. 1 port opening of 39x8 or the other port opening of 39x5. my box is only 31 inches deep so im trying to keep port length under that if possible. if i have to turn the port and go up the back wall..will i run into problems of having the subs basically playing into the port? this is subs up port back. trying for 32-34 hz. and what would be the length for each? my mac and winISD dont get along so sorry for making you guys do the work thanks.

my port is now 39x8 in...carstereo gives me a port length of 28.69 inches. for a 12.3 net cu ft box tuned to 33 hz with 1 slot port. what does winISD say?

i cant get winisd on this computer so i cant look this up. but how long does the port have to be if 39x5 and 12.3 net tuned to 33hz?

If the port is 39.5 x 5 inches, then 13.68 inches long will tune a 12.3 net cu. ft. box to 41 hz. 33 inches long will tune the box to 31 hz. I'm using WinISD for box modelling. What program are you using? im using carstereo.com and their port length calculator

so im at 12.3 net cu ft..with a port 39.5x5x13.68 in....correct?

ya definitly messed up a dimension there....heres what i got. 14.3 cu ft before displacement. 12.3 net...tuned to 31 hz resulted in a port length of 13.68 in and 39.5x5

anyone?

ya i hope my order on SSA was cancelled. I placed on order on Mach5 but now when i go to the My Account part it doesnt recognize my email or password which confuses me a little bit...

I tried to buy 2 Mj-18's from ssa and it said purchase failed. but when i get to my account and then to order history it says 2 mj-18's pending. does that mean theyre in my cart? or purchased?

thatd be great thanks. i think i got the exp date wrong so if it says pending...then the order didnt go through? because i wasnt using my credit card to do it. i then made a new acct with the name on the card thinking that would do it...and on that accounts order history its said pending for 5 hours...

thatd be great thanks. i think i got the exp date wrong

so it says 4.5 cu ft recommended for ported box for an mj 18. how would it affect sound and output if i was to do say...6.5 to 7 cu ft. each? tuned to 30hz? would i get more bottom end? more output? what...

Next week ill be buying 2 MJ-18"s for my explorer. 12.4 cu ft box tuned to 31 hz. gettin 700rms each. will this get loud enough? ive been spending a lot of time in my friends denali with 2 Fi BTL 18"s and i dont wanna be disappointed. while im not expecting output like his...will i come close at all?