ive built a prototype box out of cardboard that fits down in the well below the hump for the trunk release. i used the 2 boxes i got with my MTX thunder4000 10's as a guide and made it a little longer, a little wider and, a bit deeper...... how do i calculate the cubic feet i need and have? im still in the planning stage, but i have already brought the subs. an amp is coming soon... I have the tools and materials for making the box i just need to know the dimensions and if mine will work...TIA, the budman

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1998 Cobra convertible
1 of 267 made in
white/tan leather/tan top
#388 of 3480
mods: tan bumper inserts, pirelli P7000's on all corners

my other car:
1991 Camaro RS
teal/grey 5.0 LO3
mods: 14x3 OE w/ K&N, custom exhaust w/ no muffler and resonated tip


BEATINGS WILL CONTINUE UNTIL MORAL IMPROVES

 

wow..great replys guys.....anyways......i've narrowed it down to two choices....a board that goes all the way across and is flush with the "hump" and has 2 individual boxes for each 10 OR a single box that is made to fit down into the well below the hatchpulldown that holds 2 10's on each side

which one would be better???

------------------
1998 Cobra convertible
1 of 267 made in
white/tan leather/tan top
#388 of 3480
mods: tan bumper inserts, pirelli P7000's on all corners

my other car:
1991 Camaro RS
teal/grey 5.0 LO3
mods: 14x3 OE w/ K&N, custom exhaust w/ no muffler and resonated tip


BEATINGS WILL CONTINUE UNTIL MORAL IMPROVES

 

uh, hello, anyone out there..little help please......

 

Ya just gotta measure the dimensions of the well area. It REALLY helps to make a sketch for yourself with each panel draw separately. If you're going to match the angles of the well then you're gonna end up with some panels with triangles in them. The area of a triangle is .5bh or one half times the base, times the height (for right triangles). Remember to subtract the width of the wood from one or more sides of the panels to account for how you're going to construct it. Split the area up into smaller sections and calculate the volume for each section separately, then add them all together.

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~Luke
'91 Firebird :: L03/700R4 ::
Mods: Catco cat - Flowmaster 80 series - B&M Shift kit - TA tail lights - GTA rims - K&N - MacEwen guages
Stereo: Pioneer DEH-P8200R - Cadence 4x6's - Pioneer 6x9's - Kicker amps - Kicker 10" CompVR

 

I've always had someone to build my boxes for me so I don't have a clue either. And pianiy(?) I didn't understand a thing you said. There's some kind of logic to it I'm sure.


------------------

See my Ride:
https://www.thirdgen.org/rides/index...ew&rideid=1324

 

Just make a full box there it fits your whole well, but leave the top of it at the top of the trunk lock box...thing wwhatever its called, you know that anoying hump, jsut build it to where the top sits on top of that little edge aroudn it. I didnt chamber my box into two seperate boxes in the middle, but it still hits really hard with my two twelves. As for takign the volume, I really dont know, just to measure each part of the trunk and use geometry that you know to figure it out, but the volume I think isnt a HUGE factor in a good sounding box, all you need are the tools, wood working skills, time(about 3 or 4 days, maybe 5), and geometry skills, tahts about it.

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html

 

Oh...and make ure when the box is done that is is AIR TIGHT, so get soem silicon and silicon that mug, your gonna need it so the air wont excape, I found the best way to do that is silicon the inside, then at night stick one of those bright really hot lights used for contrustion and on cars and ****, and stick it inside the box, and look where there are cracks that you can see light coming out of, then seal that mug, cause if you gots one tiny air gap n ur box, then your box is gonan explode, and there goes all the tiem and effort.

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html

 

why would the box EXPLODE?!

 

Because all the air the will try to escape out of that one tiny little crack, and it will be too much pressure or some crap, I dont know the nitty gritty scientific explanation of it. But you need to seal tha tbitch good.

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html

 

I've never had a box explode or in any other way damage itself just because there was an air leak. Then again, I build my boxes right, so even if there was an air leak, they'd be more than strong enough. Usually all an air leak results in is crap sound, and if it's too big, your subs won't have enough damping and could be over excited and cause physical damage.

Anyway, to calculate box size, break the inner volume down into managable chunks. Visualize a bunch of rectangles and triangles, and calculate them individually. For rectangular areas, volume is L*W*D, and for triangular areas, it's .5*L8W*D.

------------------

The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
Custom Thirdgen Subwoofer Enclosures
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

Hey! I built a box...a really frakin crappy one but hey! Its air tight, it sounds good, no leaks, and it was my first box hehe.

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html

 

For a rough estimate of your box's volume, fill the box with styrofoam peanuts (but not packed in) and then take them out and measure them in an easier container, ie a rectangular cardboard box.

 

Hmm. That's a good idea!



------------------

The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
Custom Thirdgen Subwoofer Enclosures
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

hey since this is on the topic i just realized that for the box i built i think i might have made it wrongi have 2 subs in sub box and one sub is right channel and the other is the left channel. should i have made each sub have its own seperate chamber. cuz they dont and will this make a huge difference?

 

Yeah I know what I said above is another language... wadaya want? I'm a visual thinker, I'll show you how its done better than I can explain it

But anyway, the well doesn't have perfectly vertical sides therefore you're gonna end up with some odd shaped pieces (if you build it to the exact dimensions that is). You're better off building something thats relatively blocky with perfect right angles and experimenting. You're gonna waste a decent amount of wood and if this is your first box, I guarantee you'll screw up your first try. we all do. Just remember that any crossbracing that you use inside takes away volume as does the thickness of the walls. Cardboard is a poor example since its relatively thin.

If you've got enough volume for two subs then you would want to put in the divider to create two separate chambers. The subs theoretically should be hitting on the same notes at the very same time but nothing is perfect. A slight difference in timing and the box might sound considerably different or sloppy. Making two individual chambers also decreases the chance for damage if one sub goes out when the other one is now forced to play in a volume that it sees is twice what it was before. Not to mention that the seperator used to make the chambers stiffens up the box considerably.

 

Well you dont ahve to make different chambers, I didnt and it still hits hard, but if you did, it would hit a little harder since the air from one sub isnt hitting up against the other


------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html

 

1 chamber or 2 makes absolutely NO difference. The air from one sub doesn't "hit up against the other". The movement of the sub pressurizes the air chamber behind it. If you have 1 sub in 1 cubic foot you get the exact same amount of pressurization as 2 subs in 2 cubic feet.

The only time a shared chamber makes any difference at all is when you play the subs in stereo. If the output from one is even just slightly different than the output from the other, you can have catastrophic results.

------------------

The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
Custom Thirdgen Subwoofer Enclosures
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

well i got it built and i got it all sealed up....i routered the edges of most of the peices for a flush fit and have one board (top) that holds the 2 woofers and have a seperate box for each woofer, theat rest on the little protrusions on the sides of the well.....it aint the pertiest thing in the world but it sounds pretty good for my first box......no major leaks......used screws and wood glue, then went around inside with silicone sealant......nice and tight fit.....carpet is coming soon!

------------------
1998 Cobra convertible
1 of 267 made in
white/tan leather/tan top
#388 of 3480
mods: tan bumper inserts, pirelli P7000's on all corners

my other car:
1991 Camaro RS
teal/grey 5.0 LO3
mods: 14x3 OE w/ K&N, custom exhaust w/ no muffler and resonated tip


BEATINGS WILL CONTINUE UNTIL MORAL IMPROVES

 

what kind of catastrophic results? becuz thats what i got. i mean its not a big deal cuz i can just bridge it but id like to know

 

If the two subs have different signals, they can oscillate and destroy themselves, or if one gets a big hit and the other doesn't, it could cause both of them to move beyond their physical limits.

99.99% of all music (except classical and jazz) mix the bass in mono, so there's nothing to worry about as long as you can be absolutely sure that both subs are receiving an IDENTICAL amount of power, which isn't a problem unless you're using different amps or an amp that has separate gain controls.

But, overall, it's still better to run a mono signal if you're running them in a shared chamber. Series-wire them, then bridge the amp. The impedance will be identical, but they'll be in mono.

------------------

The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
Custom Thirdgen Subwoofer Enclosures
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

tahts tight. My first box looks horrendously ugly, well liek on the sides and stuff, but when i put on the terminal cups and carpeted it, with those shiny MTX 6000's glaring back at me, I was pretty satisfied, especially with the sound and the I have no dividing chambers, cause i didnt know if i should of or not of chambered them, now i know i should.

------------------
87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires

Clarion ProAudio DB315 Deck
MTX Thunder6000's 12" subs
Jensen KA3 500 Watt Amp
Pioneer 6x9s Ts-A698

-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html