Question for experienced box building pros.....

[Fish Chris]

Now, I don't want to hear a "theoretical" answer.... or a "somebody said" answer......

I want to know if somebody has actually / personally had a problem (as in > box sounded like shit) because it was not symetrical, and had two subs, firing in different directions ???

My situation is, if I build an enclosure for two 15"s, it can only be about 28" wide..... 25" tall.... with a top depth of about 18" and a bottom depth of 23" (a slanted face. Hope you can you picture that in your head) Maybe a hair bigger, if needed to make 7 cubes.... but not enough bigger to put two 15"s on any one side of it.

So I would have to have one sub in the slanted face, and the other sub in the flat, smaller top. {not worried about it looking weird, or goofy, as I will cover the box with black speaker cloth anyway, and you won't be able to see either sub {#1 for security, #2 for a clean install}

Will this "really" be a problem ?..... or would anybody that says it would, just be going by "what they were told" ? .....er should I say, "scared because they haven't done it themselves" ?

Anybody ?

Much thanks,

Fish

[Torres]

i wouldnt say it's whether 'someone was scared'. that's a pretty sloppy statement imo. it's just a better idea to have them face the same direction. i havent dont it myself, not 'because i'm scared', but because i havent needed to. but look at some of the crazy fiberglass enclosures that some people make (timmy's comes to mind first). there may be some cancellation in such enclosures, but timmy's gets nice and LOUD, especially for a sealed box. if it came to me and i had to do such a thing, i'd just put a piece of wood inside as a separator making each subwoofer in its own effective enclosure.

why dont you quit being so scared and do it eh? (sarcasm...dont take it the wrong way )

[fritosaregood]

might not be the answer your lookin for but,, if you cant fit 15s dont try, just do some twelves if your worried about having to build and rebuild to get it to sound good. or.. switch to 4 tens.. same cone area.

and separate sealed enclosures facing opposite directions would do fine. I had 2 sealed twelves facing each other a while ago. all i heard was cancellation this and that.. but it sounded gread in my car especially for havin a pos pyle amp.

[siucsaluki11]

why not have the top of the box be 2 pieces that are angled up and met in the middle, giving you room to mount each of your subs. shaped like this "^" with a sub on each side.

[Fish Chris]

Thanks guys.....

Hey Expo, 'Sloppy' ? Yea... a little I guess That was just one of those things that I could not find better words to describe. I just know that probably everybody on this forum has heard of some things you shouldn't do, because "they heard" it would sound bad, but of whom haven't actually experienced that themselves..... Yet I'm quite sure that at least "some of the time" a box goes against "the rules" and sounds great too. {as in Frito's story below > I had 2 sealed twelves facing each other a while ago. all i heard was cancellation this and that.. but it sounded gread in my car especially for havin a pos pyle amp.}

In fact, while my current box has both 12"s on the face, I actually have my port coming off of the left side (which some people will say you should not do) and on top of that, my port is 3/4's inside the box and 1/4 outside (which some guys also say will hurt the SQ) But it sounds great. Definately won't get rid of that box, when I build a new one.

Oh but hey Expo, I'm totally okay with a little sarcasm With my friends, I'd better be !

Hey Fritos, the way I feel about it is > If I can make 7 full cubes, after porting, I CAN fit two 15"s. < The only way I would not go with two 15"s, would be if I couldn't make enough airspace for them. Experience has shown me that "airspace" really is critical, for proper sub enclosure design > and is NOT just something somebody said, like I'm wondering about with unsymetrical enclosures that I'm questioning here.

Siucsaluki "^" ....that would be interesting. The thing is it might be VERY tricky for my situation, as a slanted face is still best for my space available.

BTW, if any of you haven't seen it, this is my current 3 cube box for my two 12"s.... The possible enclosure I'm considering (if not a t-line for my current two 12"s, and just doing a lightweight wall) is just a slanted faced enclosure shaped just like this, except 6" taller, 4" wider, and 5" deeper. Port will still be out the left side, as I've learned, that works just fine.

Anybody else ? Your experiences please....

Peace,

Fish

[Torres]

what i think fritos was gettin at is if you have a really hard time fitting those cubes in an enclosure then you may be better off with smaller subs to properly fit it. if it was something like sub up/port up in 10 cubes for example, and you could squeeze that in the back of your truck with enough port area and everything, then i'm sure that'd be fine. but if you try to squeeze 10 cubes in a trunk, then the subs might be right up in the trunk lid and port up close against the latch with no room for the pressure to go through to the cabin since the box is so big, which in that case you'd wanna downsize to get a more properly made enclosure in which would entail more output. bigger isnt always necessarily better. but it depends on the application to say the least.

porting to the side doesnt hurt either. i've seen plenty of people do it, especially in trucks like yours. tho it's ported closer to a wall of the truck. trunk cars do it a lot too. actually, banginaltima from this forum is doing a build like that in his car. subs up (i think) and port to the side.

also...if you can't fit 2 12's side by side from the back of the seat to the back of the truck, i wouldnt put both of them in a t-line to keep phasing issues out of the question. it *looks* like you could in the pic tho

[Ray]

im no9 pro but i agree with that expo is saying

oops this is james forgot to sign out of rays name

Edited August 7, 2009 by Ray

[fritosaregood]

Hey Fritos, the way I feel about it is > If I can make 7 full cubes, after porting, I CAN fit two 15"s. < The only way I would not go with two 15"s, would be if I couldn't make enough airspace for them. Experience has shown me that "airspace" really is critical, for proper sub enclosure design > and is NOT just something somebody said, like I'm wondering about with unsymetrical enclosures that I'm questioning here.

Peace,

Fish

i hear you one wantin 15s, im tryin to fit 2 15's in a truck with a box that works right now. My box is very unsymetrical. its got 3 chambers that bolt together in my trunk with and external port coming out over the backseats. The box is loud, and shakes houses, but for wat it is i know it can be better. so im rebuilding..again, with a more traditional shaped box.

are you worried about a the subs on opposite sides of the box? that kind of unsymetrical. if so.. i think a good bet would be 4 10's on the front face. then youd only need about a 22"x22" face which you have. and its the same cone area.

[Fish Chris]

Hey Expo

if you have a really hard time fitting those cubes in an enclosure then you may be better off with smaller subs to properly fit it.

A "hard time" and flat out, "not being able to make it happen" is two different things. If I could not get 7 full cubes after porting, I'd just abort the idea..... but I think I can.

Hey Fritos, the kind of unsymetrical I'm talking about is.... well take a glance at my current box once more.... then imagine one sub in the top, pointing straight up, and being mounted on a surface of about 29" x 19"..... then, imagine another sub on the front (aprox angle of about 30 degrees) and that surface measuring about 29" x 29".... So in other words, completely whacked > and probably what most guys have been told, will cause problems, and won't sound good.

I'd just like to hear from somebody who had some crazy angles like this going on > but who had their cubes and their porting spot on.... and then to hear if they thought it was totally fine, or it did not work out well.

Oh but anyway four 10"s = aprox 314 sq", while two 15"s = aprox 353 sq"....... Now four 12"s ??? :-) Problem there is, I like my current 12"s, but they don't make them anymore.... least wise, the exact same ones.

Anyway, I am going to build something new for my sub setup.... Not just yanking everyones chain. On the other hand, I REALLY need to get my 8" mid-bass drivers up in my doors first, anyway. What sucks about that, is I'm too freaking poor to pay somebody for custom fabrication.... and yet I've never done fiberglass work myself :-( Major effing delemma.

Peace,

Fish

[fritosaregood]

its the port going to come out the side like the box for the 12's?

and fiberglassin is alot easier than ppl think. make a frame, stretch a good stretchy fabric over it(make this part look good, leads to less finishing work), coat it in resin and let it cure, then start addin some mat( i usually do 2 layers at a time then sand off high spots and bubbles, then gets some short strand fiberglass filler to even it all out. sand sand and sand.. and your done.. it makes doors heavy though