box for 4 15's

[justin_garrett]

OK i'm going to be building a box for a friend of mine sometime and he has 4 15's that are mtx thunder 8000's and was wanting some thoughts of the box i design i did for it

here are the spec's for it

do you think i have enough port area

here is the box ( the bright colors are just to show the different boards and where the port is)

Edited November 11, 2011 by justin_garrett

[justin_garrett]

bump for thoughts

[Quiet]

Have you modeled it in anything like WinISD? 2.5 cubes per seems smallish-average but it's hard to tell without seeing a response curve.

[justin_garrett]

about 2.25 net cubes is what the mtx site says but i will take any suggestions any one has and i haven't ran it in winISD yet

Edited November 12, 2011 by justin_garrett

[pa-pa-platypus]

4 of those woofers only displaces .18 cubes? and what kinda bracing do you plan to use in the box?

[Quiet]

I've been generally happy with adding 20% volume and more port, tuning a little deeper. Seems to do more than cramming more cone area in less box, especially with the lowz. YMMV but I'd model in WinISD and play around with volume.

The box I built for my RF 15 gets stupid low when compared to what the manu recommends built a 3.5cube over 2.6 they recommend... Marketing depts make them keep the #s low so they can sell more subs to more people... Just think, if you didn't think you had room in your car for a 12, but the manu says you do, you'll probably buy one, even though the sq will be marginal.

[justin_garrett]

i cant really get the hang of winISD so i was thinking of maybe 12 to 13 net cubes with around 15 to 16 in2 per 1 foot of port do you think that would be any better

[Purplehaze]

i cant really get the hang of winISD so i was thinking of maybe 12 to 13 net cubes with around 15 to 16 in2 per 1 foot of port do you think that would be any better

Yes I do! But I'd keep it similar in style to what you designed. It's a good one

[Quiet]

WinISD is pretty easy. You do have to do a couple things first...

Find the T/S params of your subs (Qts, Qes, Vas - get the manual)

Click on New and make new entries for your subs. watch out for standard/metric units... that will throw it off. Just click on the unit (The cm, in, ft, etc.) to toggle through.

after that, click on new again, choose your sub and it's easy from there.

For comparison, it doesn't hurt to add subs to the list you've had before, then when you model a certain enclosure volume and port tuning, you have something to compare to.

WinISD does not take into account cabin gain, so the curves are close to what you'd see if you put your enclosure on your driveway and measured it. It's just a tool to help you get an idea of what a certain enclosure design will do before you go out and build it.

[justin_garrett]

i tried the winIsd i put the T/S specs in but i just couldn't understand what to really look for but i went ahead and changed some specs in torres box calc and this is what im looking at now

now have 11.78 cubes net and 16.98 in2 per foot of port