Ok! So I have started to plan out my enclosure and figure out the volume and the measurements needed to make my subs perform as they are intended.

The Alpine 10" Type R calls for .65 cu/ft volume per sub

The Thickness of the MDF wood is going to be 3/4"or (.75) Thick


So the measurement I have come up with to accumulate a single sub using a calculator from Carstereo.com is L=8" H=15" W="14.3
(Question- Length is Depth?)

The Measurement to contain 2 of these subs would obviouslly be double making the box in Width which would be 28.6"

I was thinking about seperating the subs in different chambers so should I just add a 3/4" piece of MDF at 14.3 dead even with the center of the width of the box.


Anyway I know this is alot of math and it took me alot of time, so I'm hoping maybe someone can breeze over this really fast and let me know if this all sounds correct.. This is especially a call out to Josh because you always know the answers and are always a big help to my questions.

Thanks In Advance
Mike

"L=8" H=15" W="14.3
(Question- Length is Depth?)

The Measurement to contain 2 of these subs would obviouslly be double making the box in Width which would be 28.6"

I was thinking about seperating the subs in different chambers so should I just add a 3/4" piece of MDF at 14.3 dead even with the center of the width of the box."

1) yes, length is depth, that is going to be the distance between the front baffle (that the subs sit on) and the rear wall of the enclosure.

2) math time <thinking cap>.

8" for the depth. this stays the same because of the way you assemble the enclosure.

15" height

29.35" width (14.3x2+.75 for the divider)

now wait..assuming these are the external measurements, lets see what airspace this enclosure provides:

8" depth stays the same (because one dimention will always be the same)

15" height minus 1.5" (for the two sides at 3/4" each)=13.5

29.35 minus 2.25" (3/4" for each side, plus 3/4" fo the dividing wall)=27.1"

now we multiply those numbers of internal volume together and divide by 1728 to determine the total internal airspace for both speakers in cubic feet.

8x13.5x27.1/1728=1.7 cubic feet, or about 0.85 cubic feet per speaker. take into acount that each speakers frame and motor takes up about .2 cubic feet, and you arrive at a perfect 0.65 cubic feet of airspace per speaker. good job mang:cheers

Awesome! You clarified it even more for me Josh. You are the man thanks :-) I feel alot more proud to have worked this out than when workin out problems at school. Finally math pays off for me

Another Question: Should I add another piece of 3/4" MDF wood on top of the front where the subs mount? I have seen this done and was curious on if its worth doing?

no, you dont need to do it, especially if youve got a baffle in the middle to reduce resonant vibrations form the speakers movement.

This doesnt pertain to my enlcosure but for the wiring of my subs is this how it should be done?

Disregard that last post about the sub hook up.. The illustration is wrong and I figured out how its suppose to be done.

Thanks

LOL, i saw the drawing last night, but i was just heading to bed and probably wouldve screwed up my response. yes, you had it wrong. instead of looping each VC, you need to run the two together, + of one VC to the - of the other (per speaker). once you have each speaker running in sieris, you wire both speakers TOGETHER in parallel by connecting the +s together and -s together and to the amp. sorry, its a vague discription, but i just wanted to make sure you had it down, lol.

For the subs do they have to be directly wired to each other in that way or can I wire them thru the external ports on the box. Reason I am asking is because the box that I am using temporarily now has a dividing wall so I can't really hook them up directly in the way you suggested unless I drill a whole thru that dividing wall. Is that alright to do or will it mess up my audio?

Also can you illustrate how it suppose to be done? I am picking up on this vaguely.

LOL, worst picture ever.

http://www.kaptainmyke.com/forums/index.php?act=Attach&type=post&id=28708

Could a sub be damaged by the amp if it is wired incorrectly? Also how many ohms will the subs be at in the setup you showed me?

you RISK damage by only wiring one voice coil (VC) to the amp, as your original drawig illustrated. the risk of it is about %.00001 though, lol. no need to worry.

in the drawing i showed you its wired as such: each sub has its VCs wired in series. this doubles the impedence (so if there are two 4ohm coils, they "combine" to make an 8ohm total impedence). then the two subs are wired together in parallel this cuts the impedence in half (so the two subs which are now 8ohms "combine" to produce a total 4ohm load from all 4 VCs.

the math works the same for other combinations as well. if each of the subs has two 2ohm coils, then sieries coils=4ohms per sub, parallel wiring of subs=2ohms total resistance.

Is it alright to drill thru the dividing wall to run the wires to each sub?

yes, no prob. if you want to keep each side totally airtight, you can run the wire through and then put some silicone on it to seal it up. you should use silicon on the inside seams of each piece anyway, so you should have some to spare, lol.

Josh I was looking at this and was wondering If I could wire my subs like this