Upgrade from 12" BTL to ???

[b34tBoX 0]

Got a 12" BTL in 2.8cuft enclosure at 30Hz.

Upgraded from a BL, and well, it took about a week to get used to the BTL.

I have 31" x 18" x 16" of enclosure space available, maximum. (largest I can fit in trunk opening)

However there's some space around enclosure once in.

Would like to upgrade to something else.

31 x 18 x 16 = 4.0cuft internal before displacement with 3/4 MDF

Would like 12" Q's. Can it be done using external areo ports?

Or what are my other options? I have a 2500D amplifier.

Goals are to move more air than the 12" BTL, and I prefer lows.

[Kanaworm$ 292]

What don't you like about the BTL?

[aimone 4]

to move more air you more cone area I.E. get a 15 or an 18 or another btl12 to go with the one you have. and i'd probably get rid of the back dash speakers so that there is somewhere for the air to move. i'd say 2 good 15's that will handle the full power of your amp and build a box in the trunk using every bit of room u got with them facing into the cab. hell 1 btl 15 in the right box should be plenty

[antonmiller 8]

1 12" BTL is plenty, and like stated above what dont you like about the BTL?

[b34tBoX 0]

to move more air you more cone area I.E. get a 15 or an 18 or another btl12 to go with the one you have. and i'd probably get rid of the back dash speakers so that there is somewhere for the air to move. i'd say 2 good 15's that will handle the full power of your amp and build a box in the trunk using every bit of room u got with them facing into the cab. hell 1 btl 15 in the right box should be plenty

How would I fit those combination into the trunk?

I have a fold down center passthrough in the rear seat, which I leave open.

12" BTL is fine for what it is, but it's not enough.

I'm trying to choose something that still meets Fi's enclosure specifications. I figure that's really important?

[slim2fattycake 85]

WTF? How is it fine if its not enough? I say build a new box and do some testing on your system. Aeroports will help reduce the needed gross size of the box if you do decide to go with two subs in that area. And what amp do you actually have?

Also, what are you reallying wanting? More lows or more output on the top end?

[b34tBoX 0]

I could do a 15" BTL in 3.0cuft enclosure after displacement with 43 square inches of port @ 30.5Hz?

Box might be too small though.

Fuck my car.

Edited June 18, 2010 by b34tBoX

[b34tBoX 0]

WTF? How is it fine if its not enough? I say build a new box and do some testing on your system. Aeroports will help reduce the needed gross size of the box if you do decide to go with two subs in that area. And what amp do you actually have?

Also, what are you reallying wanting? More lows or more output on the top end?

I'm saying the 12" is OK, but I would like more output on the lows.

Build a new box? What's wrong with the one I have. Too large?

Amplifier is Soundstream Rubicon 2500D

OK, then what size aeroports would I need for 28-32Hz with an enclosure size of 4cuft before displacement for those two 12" Q's, or one 15" BTL.

Edited June 18, 2010 by b34tBoX

[b34tBoX 0]

Alright, change of plans.

Here's my final decision, thanks for bearing with me. =]

I'm going to do the 15" BTL in 4.0cuft enclosure with aeroports.

Would like it tuned to 30Hz.

Now how do I figure out the port dimensions?

[slim2fattycake 85]

Your maximum dimensions you gave are right at 4 cuft. You would have to subtract bracing volume and sub volume if you use external port. I'd say no on that 15".

[kirill007 52]

I would upgrade to a better box instead...

But i just like to build boxes and get louder with the same equipment.

[aimone 4]

hey its possible to fit large objects in small spaces its all about the determination...lol

instead of buying a new btl just try other box's and maybe a sundown or cresendo 3kw amp since there the same and like 1/2 the price

what ohm load u wired at?

[b34tBoX 0]

hey its possible to fit large objects in small spaces its all about the determination...lol

instead of buying a new btl just try other box's and maybe a sundown or cresendo 3kw amp since there the same and like 1/2 the price

what ohm load u wired at?

Soundstream is running at 1ohm, with gains up just a tad over half.

It puts out some serious power, there's no need to upgrade it.

Your maximum dimensions you gave are right at 4 cuft. You would have to subtract bracing volume and sub volume if you use external port. I'd say no on that 15".

Okay, so 4cuft minus .21 displacement = 3.89cuft.

I don't think I would need extra bracing. I don't with the 12" anyways.

Fi says 3-5cuft for 15BTL.

I had thumper build me a box that was 2cuft after displacement for the 12BTL and it sounded great.

Fi recommends 1.75-3cuft for that size, so I don't see why 3.79cuft wouldn't work for a 15".

PS: I could always use some hardening resin on the outside of the enclosure to stiffen the box up if need be. I suppose?

Edited June 19, 2010 by b34tBoX

[b34tBoX 0]

How about these specifications for the ports?

[b34tBoX 0]

I'm wondering if two 12" Q's in a sealed enclosure would be better than my 12BTL in ported?

Would they be able to play as low? <30Hz

[Notorious on mobile 0]

I'm wondering if two 12" Q's in a sealed enclosure would be better than my 12BTL in ported?

Would they be able to play as low? <30Hz

Don't do the 2 Q sealed. Just my 2cts.

You seem to want more low. Why did you get a btl ? I don't know if it is the best choice for your goal.

Maybe you should try the famous ssa xcon ?

[tejcurrent 13]

With your vehicle it sounds like you just need to work on your enclosure. The audible difference between one ported and two sealed subs on the same power will not be that great, and you'll find that you spent a lot of money "upgrading" just to be let down a week or so later.

Sounds like you really need to look into vehicles like hatch backs and SUVs.

[bassahaulic 155]

You need a wall. Simple as that.