i want to redo my hatch area. i built this a while back and it looks nice but they just dont hit very hard facing up for some reason. same speakers in a band pass box really boomed. current box originaly was sealed, with a diveder inside seperating the 2 subs, i tried porting it, didnt help much.

im thinking about building a bandpassbox with plexiglass for the roof of the box. then building the floor around it.

any other ideas for 2 10's? car is not for show or competition, i just want somthing that looks good without sacrificing sound.

-johnny

"Few people understand
the psychology of dealing
with a highway traffic cop.
Normal speeders will panic
and immidiately pull over to
the side. This is wrong. It
arouses content in the cop
heart. Make the bastard
chase you, he will follow..."

http://homepage.mac.com/
johnnycorona/signature/logo.jpg

-johnny

"Few people understand
the psychology of dealing
with a highway traffic cop.
Normal speeders will panic
and immidiately pull over to
the side. This is wrong. It
arouses co

I had the same design only facing down with 2 12s and it hit harder than hell. bandpass is hard to design so I would not advise it

"Only Pirates Say R"
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you mean facing down from top? so you can see the back of the speakers instead of the front?? maybe ill try that.

as far as the band pass goes i already have one (the one the subs original came in), so im just thinking about modifiy it some way that it looks good back there.

either that or im thinking about adding 2 more 10s. anyone successfully fit 4 subs back there?

-johnny

"Few people understand
the psychology of dealing
with a highway traffic cop.
Normal speeders will panic
and immidiately pull over to
the side. This is wrong. It
arouses content in the cop
heart. Make the bastard
chase you, he will follow..."

http://homepage.mac.com/
johnnycorona/signature/logo.jpg

-johnny

"Few people understand
the psychology of dealing
with a highway traffic cop.
Normal speeders will panic
and immidiately pull over to
the side. This is wrong. It
arouses co

although im not a huge fan of MOST bandpasses, ive heard a few that sounded really good. if you like the way the one you already have sounds then definatly put it back in, just trust your ears.

and yes, you can easily fit 4 10s back there, youll just have to be a little creative with the space. its better to have two subs in a slightly larger enclosure than to have 4 subs in a too-small enclosure.

a question: what kind of sound are you looking for? tight kickdrums (like in rock/techno) or low bass (rap/classical)? ive had subs in literally every location you can think of in that car and in varying box sizes/designs so i might be able to help you out.


edit: whoa...whered that star thing come from? thanks for the feedback fellas

:shhh: i do cocaine :/shhh:

Whoa man..

That pic you have up there looks pretty cool as it is. I ought to try something like that.

I dont understand how you guys want so much bass. After getting my Alpine Type R 12'' in the back, its like all i ever needed and more..its sooo freakin loud to me i have to keep it turned down halfway.. To each his own, i suppose..


oh, and dude ^^^ me..right now i have my Sub firing up at the glass....is that ok? also, i have that piece of board that covers up the trunk space (you know, that gray thing that came with the car)...should i keep that off, or on? is that affecting the sound at all? And how would someone set up their subs to get a different type of sound ( i personally listen to either Rock/Electronic) so im lookin for that tight bass sound..

Thanks!

as long as it sounds good to you..theres no reason to change it i would think youre getting a lot of rattling from the cover thing, though. firing the subs staight up in the hatch is a great place. it reduces destructive interference from reflected waves because the sound waves can only "bounce" off the glass and go in one direction, instead of "swimming around" and hitting each other.

as a general rule of thumb for sealed boxes: the bigger they are, the less power it takes to compress and rarefy the air in the box, so the sub can move more easily. the resonent frequency of the system also shifts down, so it will play deeper (up to the mechanical limits of the sub), but the responce will be spikier and it might loose som of the "kick". the opposite happens when you decrease the box size. to me, subs usually sound best in a box thats about 20-30% bigger than what the factory specs call for, but i like looooooooow bass because i have midbasses up front for everythng 60hz and up. you may not like that.

vented (ported) boxes: the idea behind these are to "line up" the back wave coming off the speaker with the front wave. these boxes are "tuned" to a certain frequency. below this freq. the sub looses all control and plays as if it were in open air. about 1.5 octaves above the tuning freq. the box peaks...this is where its loudest. it is possible to make HUGE gains in SPL by tuning a box correctly. to do this, you use a port of a certain length. the longer you make the port, the lower the tuning requecy is, and the "lower" and "boomier" the responce is. by decresing the port length, you are "trimming off" the low end of the sub, and re-inforcing the upper end. the only application this is useful for is in SPL competitions. anything tuned higher than about 40hz is pretty unlistenable; plus because the sub looses all control of itself below the tuning frequency (it "unloads"), its possible to damage the sub like this (unless you have a sub-sonic filter). the box also makes a difference. by making the box bigger, you can use a shorter length of port. the "peak" i mentioned before also rises in amplitude, but this can lead to choppy responce.

bandpasses are a combination of the above two, and are way to complicated for most people, so im not going to go into them too much

theres also aperiodic bi-chamber, transmission line, infinate baffle, isobarik and more, but there not really worth it most of the time.

the real key to having good bass is to prevent cancellation from destructive interference. when the speaker produces sound waves, they are going to travel in every direction, not just straight ahead. if you put a box in the middle of the room facing upwards, and listen to it, the waves will scatter around the room, and bounce back to your ears at different times. the waves that go straight towards your ears will be affected by the reflected waves and canceled out. by putting that box in the corner, facing a wall, we force the sound to go one way, so the sound waves line up correctly. the same principle applies to the automotive environment. if your box is facing the back hatch or the glass, the sound can only go one way. if the box is sitting in your backseat, the sound spreads throughout the car before being reflected back toward your ears. thats why most vehicals sound better and louder with the box close to the rear, facing the rear instead of facing the front pushed up against the backseat.

ok...well thats enough for now. above all, the best piece of advise i can give you is to use your own ears and judgment...dont count on everyone elses opinions to make your decision..and have fun!!

:shhh: i do cocaine :/shhh:

wow... that was pretty intense. thanks for all the info. i know what you mean about the low frequencies... my box as it is does not hit low frequencies well, but gives a good punchy feel to higher base freq, which sounds good for stuff like rock. what about a box that had say 3 subs, 2 of them built larger to hit lows, and another enclosed in a smaller box to help with the higher punchy base.

would that work? or would they conflict with eachother some how?

-johnny

"Few people understand
the psychology of dealing
with a highway traffic cop.
Normal speeders will panic
and immidiately pull over to
the side. This is wrong. It
arouses content in the cop
heart. Make the bastard
chase you, he will follow..."

http://homepage.mac.com/
johnnycorona/signature/logo.jpg

-johnny

"Few people understand
the psychology of dealing
with a highway traffic cop.
Normal speeders will panic
and immidiately pull over to
the side. This is wrong. It
arouses co

that COULD work, but it needs a lot of tuning and probably extra equipment to get it right. kinda like running sequintal turbo . running all of them at the same time will probably not sound good, as the different frequency responces will conflict. if you were to buy a crossover with a high cut-off slope (24db/octave), you could run the 2 "low" ones from about 60hz and down, and run the "high" one at about 50hz and up. that would probably sound good, but i dont know if you want to put that much work into it.

:shhh: i do cocaine :/shhh:

ok the way I have my system right now is s subs in a dual bandpass , each with its own amp. and also 2 amps running the frotn set and rear set of speakers. Now I have another amd and another sub to put in there. I was thinking about that 3 speaker set up. you say it would be a lot fo work,... how about using the built in x-overs to tune it? or it wouldnt be that accurate? oh BTW its All JBL Pro-power series ; )

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good lord man....you got an amp-growin tree in your backyard good choice on the JBLs though.

in answer to your question, that should work fine. you will probably have to play around with the gains and crossover cut-offs to make the two blend, but because they are two seperate systems the only other thing you need is time to tune it. it might also help to have an eq, you will probably get either a big peak or big vally in the responce around the crossover point between the two systems. try to get the speakers physically close to each other and on the same plane as well. that will help tuning a LOT.

BTW...weve really gotten off-subject here! feel free to make new threads on the audio page.

:shhh: i do cocaine :/shhh: