18" in an Escape build

[djtomczak 5]

Don't have anything to show yet, but here is the plan:

8 cube box with an 8" aero port. 3/4 mdf all the way around with double layered top. 8" PVC port flared and flush mounted. 2x4 going from front to back, and top to bottom. Going to use bolts through the side as terminals. Woofer will be either an 18" UFO BTL or HDC3. Tuning will likely be 30hz. Amp is an old school Memphis 1500w. Old school meaning back before they wired to 1 ohm. Stock alt holds at 14.1 v with the red top under the hood so electrical won't be upgraded. I'm getting the wood and building the box Sunday. Opinions? Tips?

[edouble101 314]

Another guy from PA

[djtomczak 5]

Hoping to have this done by the 15th so I can show off when the sound lab visits.

[Randal Johnson 544]

<< Tuned in ...

[CHRIS 323 12]

pictures or this thread is worthless

[An-i-no 86]

pictures or this thread is worthless

He's supposed to post pictures of things that haven't happened yet?

[nem 2,019]

Another guy from PA

18 inch subs are yummy!

Edited March 30, 2012 by nem

[djtomczak 5]

How's that look?

[CHRIS 323 12]

pictures or this thread is worthless

He's supposed to post pictures of things that haven't happened yet?

once hes able to not right now lol you must be a SMD member too bringing your gay attitude here lol

[An-i-no 86]

pictures or this thread is worthless

He's supposed to post pictures of things that haven't happened yet?

once hes able to not right now lol you must be a SMD member too bringing your gay attitude here lol

Lawl. You cannot be serious.

[16K 159]

tuned in

[bassahaulic 155]

A few things. I wouldn't do a box that large with higher power woofers, they don't like it to much.

Biggest thing, your port area. I'd go WAY up with it, to about 16^2-20^2 of port per cube.

I would do 7^3 of air space with 20^2 per cube tuned to about 38Hz since you will be on the lower end of RMS on big woofers. And the large port area will allow the woofer to still drop low, while maintaining high output.

[djtomczak 5]

Alright I'm completely lost with the ports. I make the port longer, yet the port area doesn't change. Could someone figure out the ports I would need for a box within those dimensions?

[djtomczak 5]

As soon as I get this box design down I'll go and get the wood! Help?

[dbsupra 69]

Port area has nothing to do with the length of the port.

It is the size of the opening. 14" x 3" would be 42 sq in

[dbsupra 69]

I don't know what space you have to work with.

But based on Drew's recommendation and a minor tweak:

22.5 H 38 W 24 D

Square port: 17 x 7.5 with 24 length

7.06 cft net

127.5 sqin port area

18.07 sqin per cube

38.2hz tune

That is a lot closer and best I can come up with in 5 minutes lol

You can tweak around on that to get exactly what you need.

[djtomczak 5]

Does that port length include the 90? Or is that port opening to back wall, then the 24?

[dbsupra 69]

That is a square port, not a slot port.

Like this

[djtomczak 5]

Wouldn't a square port look kind of awkward with one woofer?

[CHRIS 323 12]

are you looking for something like this ?

[djtomczak 5]

Well I'm looking for sub and port facing up, it's in the back of an SUV. The box will be against a wall on all sides, so only option would be up.

[wannabang 13]

I'm working on a box with an almost square port and one sub, both up. Although, the sub is square.. I think it looks fine.

[ncacoates 104]

In my tribute getting the port as far back as possible is the loudest. Why not a slot port port facing up on the back wall?

[djtomczak 5]

Figured it out using Audioques size recommendations. Box is going to be 6.3 cubes after all displacements, 36hz tuning with a slot port. 87 sq inches of port. Bought the wood today, but I need a new blade on the saw Double baffle on top with 2x4 bracing. Port and sub firing up. Oh and if it isn't clear yet, it's going to be an HDC3 18

Anyone want to buy my old SA12's? Still as stiff as they were on day one!

Edited April 3, 2012 by djtomczak

[djtomczak 5]

Cut marked out.

Found a program that maps out the most efficient cut pattern, worked out nicely.