Real Car Audio

[Eazydoesit]

I built my first ported box with one 12 and I love it but I already want more I was thinking of isobaric but I don't think I will get what I want out of it so I figured out a way to build another box that will fit 2 12's but do to the shape of the box I can't seperate each chamber equally so that they will both have enough airspace. Does each speaker require a sperate chamber, or does it matter as long as there is enough airspace for both?

[dBfReAk]

You can do subs in different or same chamber. I dont really think that the difference will matter as long as it isnt that big of a difference.
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Highest SPL: 151.8 on dash - 1 12" Mojo (In a Volvo) Audiocontrol

[XMAX-1]

You can put 2 subs (or more) in a commpn chamber, provided the speakers are recieving the same input signal (mono) and same power (must power match if using multiple amplifiers on the subs).

Use seperate chambers in using a "STEREO" signal to the subs or IF you can't power match miltiple amplifiers. Confusing isn't it? lol
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[Eazydoesit]

Thanks guys will it change spl or sq. at all as opposed to seperate chambers or is the only difference justhe input signal, also would I need to double the ft3 of my vent. Thanks in advance

[XMAX-1]

It would be a good idea to go with a larger vent area due to increased air volocity and volume. 50-70 in^2 is usually enough for a pair of 12" subs up to 1500 watts rms.
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X-MAX CAR AUDIO
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[Eazydoesit]

Thanks X you the man I'm assuming as long as I add port volume and wire them mono you won't be able to tell if they are in a single chamber sound wise? Does it matter which way the vents are situated to the subs? I'm just guessing but it seems like if they were next to the subs and the air was hitting the back of the enclosure then coming out of the vents it would come out smoother and sound better and be a little louder? Thanks for all the help!

[GhettoTaurus]

They should sound virtually the same. Some people claim that seperate chambers (especially in sealed boxes) has better SQ, but i don't think it makes much of a difference.

I usually put subs in the same chamber, because you get more over-all volume (otherwise you loose the airspace that the "divider" is displacing - not a lot, but its still more airspace).

The only reason to ever run seperate chambers IMO is if you have the subs on different brands or types of amplifiers, or if the subs are different brands or types..... but doing that is stupid in general.
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[Eazydoesit]

Thanks ghetto thats what I was thinking anyway any thoughts on the vent location?

[JIF]

Having vent on a different side of the enclosure is usually best. Having a divider is more bracing, so you may find some advantage if the enclosure is larger.

[Eazydoesit]

Thanks jif any suggestions on which (different side)? or just any side other than the subs? Also is it better to have the vent as straight as possible or for it to turn?

[Eazydoesit]

Hey JIF I was checking out that box you built and posted pics of back in july ( the osb box) I love that design; would that design make it hit louder than just a regular straight vent? I know you built it to direct pressure through an armrest but would it work well in a truck cab. If it would make that big of a difference I would stick with my single sub instead getting another. Also what was the total port volume? That is if you don't mind your design being "borrowed" I'm planning on starting a new box tommorrow if you could get back soon I would appreciate it Thanks alot!

[XMAX-1]

[GhettoTaurus]

[Eazydoesit]

Both of you have good points but I see what X is getting at better to be safe than sorry if possible my original reason was because the box was going to be an odd shape and I wouldn't be able to get both chambers the same size but I think I can make it work out now I'm just not going to be able to but the box where I originally wanted so I'm just gonna put it in the backseat. As far as the vent locations it is going to be in a truck cab so what ever works best in an suv would probably work about the same in my case. I think I'll try facing the subs and vents up thanks for the help guys.

[XMAX-1]