I am currently running 2 Diamond Audio D315's in a ported box that is sitting on my backseat. There are two problems with this setup.

1) I can't use my backseat.

2) All I hear is port noise when I turn them up.

My Idea is to stick one of them in a ported box in the trunk. I don't want to lose a ton of volume if I can help it. Any Ideas on how to get the absolute most out of one of these subs while still keeping it in the trunk? The only thing that I think might save me is that currently, I'm a shade under optimal air space.

Just wondering if anyone has any ideas (maybe a nice box design generator?)
http://www.diamondaudio.com/PDF/current/D3/D3%202%20subwoofer%20manual.pdf: spec PDF if anyone is nice enough to plug it in for me

THANK YOU!


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

The colon at the end of the link is what screws it up. Sorry!
:p


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

why arent they in your trunk to begin with?

Best. Picture. Evar!!!!

Go sealed. It'll be a smaller box, but not as much output.

^^^I dont know......looks kinda ghey to me

whiteboyz24 wrote:^^^I dont know......looks kinda ghey to me

agreed

Okay, to help out the OP.

First off if all you hear is port noise, your port velocity is too high meaning that your port is too small.

Second, just design a sealed box for both 15's and throw 'em in your trunk. You'll have to slide the box in from your back seat, but it will give you use of your back seat again...and besides, anything you'd normally stick in the trunk will fit in your back seat just fine.


'03 Cavalier
DesertTuners.com

ok, here's the thing, if I'd have wanted sealed, I'd have said it. And I like that picher =P

Anyone have anything constructive to say?


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

chances are you your getting allot of cancellation just from having it sitting in the back seat like it is. putting them in a proper sized box in the trunk, even a sealed one will likely result in more bass and less port noise. why do you have to have it ported? whats wrong with sealed. a sub in a ported box that is to small will sound worse musically and may not even hit as hard as if it was in a properly sized sealed box.


http://www.flickr.com/photos/sndsgood/ https://www.facebook.com/#!/Square1Photography

it's picture, not picher.

98_JB-OvERT wrote:ok, here's the thing, if I'd have wanted sealed, I'd have said it. And I like that picher =P

Anyone have anything constructive to say?

Ok, here's the thing...don't ask for help and be a @!#$ douche. You're the one who asked for input, and if two people already told you to build a sealed box, there's probably a reason.

Wait for it..........oh yeah, you said you wanted to minimize displacement of the enclosure, that's right. Don't ask for input if you don't want if you little @!#$in prick


'03 Cavalier
DesertTuners.com

I like subs in ported boxes is why, lol. I've had both and I like the way ported sounds. And the only reason I said that is because everyone came on and treated me like an idiot cause I want a ported box without thinking that maybeeeee I had a motive for it.

Sorry if I stepped on anyone's toes....


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

That's cause you don't say that you want a ported box and then say that you want to minimize displacement...the two just don't work together. Ported boxes are usually 1.5-2 times the size of a sealed box.

You also might want to mention what kind of amp you're running, preferably with a model number, and whether the subs are dual 4 or 2 ohm voice coils...especially if you want someone to design a box for you.


'03 Cavalier
DesertTuners.com

well i just did a little bit of designing and this box is going to be big and hard to get in the trunk but the overall dims are 28 x 16 x 16 and ill post up a dwg some time (maybe if i find time). oh and thats for 1 of the subs not sure about two of them





click sig for my car audio videos

sorry i recalculated it and it came out to 29 x 16.5 x 16.5 and im not sure but i dont think its going to fit in the trunk as in your not going to get it in. it will fit but good luck getting it in. the problem will be the height of it. if it wasnt a 15" it would be easier.

Im no pro at box building so if anyone can get it in a smaller box then please do.

2.5 cu ft of airspace after port and sub displacment. 15 x 2.625 port that has a total length of 36.8125, tuned to approx. 31.5 hz.





click sig for my car audio videos

You can get that in the trunk, you just have to slide it in from the back seat. There's clearance for a box about 17" tall and 20 something inches wide (wider if it's shorter).


'03 Cavalier
DesertTuners.com

For someone who thought it was a good idea, and a good sounding setup to have your sub box sitting on the back seat, you sure have a hard time being treated like an idiot.....
and your attitude towards someone who tried to give you a bit of insight was quite uncalled for. He is right though, to give those subs the airspace they need in a ported box, i doubt you are able to fit it in the trunk. But hey, who are we? Just the people that you asked for help. Being the kid who currently has his sub box sitting on the back seat, I'm sure you would rather tell us that you built a box that fits and simply cut a "port" in it because it sounds better to you.


On the other hand....you have other fingers.

In my family we teach that boys have a God-stick and girls have a Shame Cave. -John Stewart

i never questioned the ported box. i did question why you had it in your back seat, which you never answered.
you have 3 options:
1) build a sealed box.
2) do a ported box, but if there isnt enough room....think outside the box(no pun intended) you can piece together a box inside the trunk. use the spare tire well for more room. its not that hard.
3) the box for 2 ported subs is going to be the minimum requirement to fit. manufacturers always give you min. and best volumes. use one sub and build the box using the most cu. ft. recommended, which will be close to the min. space for 2.

I say build a sealed box for both, or a ported box for 1, and you will have better results than a beat box in yo back seat.

but again, if you dont want our advice, dont ask for it.

Ok, you're making too many assumptions here :p
I never thought it was a good idea to place them in the back seat. It was never going to be a permanent place for them. And the "anything constructive?" comment was to the people who said my picture looks gay.

And because I drive a lovely convertible the trunk opening behind the seat is only 15" tall at the very center. Gay. I'm really fighting an uphill battle here "/

Another question I had was if there was any way that one sub in a rear-facing ported box or in a bandpass box perhaps would sound better than two subs in sealed boxes.

Amp: Hifonics Titan TX1505D

1500W RMS 1ohm
900W RMS 2ohm
400W RMS 4ohm

Speakers: Diamond Audio D315 DVC 4ohm

500W RMS (250 Per-coil)

Seriously, I don't want to piss anyone off, nor was I trying to. You guys have been a big help to me


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

I wouldn't do a sealed and ported. It'll sound like ass. Second, a true bandpass is going to be about the size of your ported, so ixnay that idea. Problem I see too is your speakers. If you do a single, at 2 ohm, you're going to be double the RMS, and I don't think those speakers will take it. 2 of them at 1 ohm, maybe. Still pushing it. My suggestion? Ditch the subs, go one single beefy ported sub, or ditch the amp and go something smaller.

Well I could wire each coil independently and run 400W at 4ohms with one sub in a ported box. But I don't know if that would be as loud as two sealed 15's, which I'm reasonably confident I could fit providing I assemble the box in the trunk. I'm willing to sacrifice a few DB's to have them be a bit more secure and have a backseat again.


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

no you should not wire each coil individually. never not at all. dumb dumb dumb. you don't have the know how to run a channel of an amp to each coil, i promise.


On the other hand....you have other fingers.

In my family we teach that boys have a God-stick and girls have a Shame Cave. -John Stewart

My bad. Here I was thinking that my Mono amp only had one channel. I'm sooo stupid.

To clarify, I was simply going to wire each coil, to each output on my amp so that they were not in parallel or series. So the amp saw a load of 4 ohms. But I MUST be wrong.


There's a thin line to be crossed, when the upgrades to your vehicle increase your chance to get tickets by an amount exponential enough to stop worrying and build the fastest, loudest car you can.

If you have a mono amp (which you do) and there are two outputs, they are the same channel, just two sets of terminal blocks that are paralleled internally in the amp. They are there for ease of installation for the most part.


'03 Cavalier
DesertTuners.com