Here's my box I made for my new FI BL 15.  This will be going into my 2014 Focus ST and will be driven by a Brutus 1200.1d at 1 ohm.  Box is 3/4" Oak Plywood

and is on the high side of 4.2 cubic feet.  It is stained with Minwax Cherry Blossom stain with like 8 coats of poly.  Empty Soda can is for size comparison.   Has 14" long 6" psp aeroport tuned at 32hz.   Turned out a little more Purpley/Burpley than I initially wanted but I said to heck with it and left it Burple.  Looks a little more reddish Burple in the sun than in this pic. 

 

The shade.........It's growing on me.

 

I did a little shake down run with a old RF Monoblock amp I had running a 18" obsidian.   It sounds (at least to me) Fantastic.  Box has SIX 1 1/4 oak dowels one under each sub screw hole and two  1 3/4" oak dowels along side the port off to the side.  It's pretty stout.  Box is 34"w x 14"H x 22" deep.  Ordered some Dayton Binding post's that haven't showed up yet, hopefully this week..

 

I'll run this sub traditionally until Scott  from FI can find me a Magnet cover to hide the chip on the Magnet.

 

Not everyone's cup o tea   but I'm old..... and I like tea.   

 

 

 

 

More port area would benefit you if you ever rebuild

its a 6" ID psp port 14" long.

Sean's right, a 6" round port isn't going to breath as good as it may need it to.  Unless port noise becomes an issue you're fine for now, don't think it's completely jacked.  That's why he said if you ever rebuild it that you should give it more port area.  The only problem with that is the box will become exponentially larger when the port area becomes larger so you may be stuck between a rock and a hard place in that little car if/when that times comes.  So again, unless the port noise is so bad you can't stand it don't worry about it right now.  Listen, enjoy and think about what you might do with it in the future.  

 

As for the enclosure itself, I think it's awesome.  Very cleanly bulit, nice ideas on the bracing, and that stain just makes it pop.  Sure, might not be the color others would choose but that's why you own it and not them, lol.  I can't wait for you to get it installed and broken in.  You think you love the sound now and it will just get better!  The tuning will drop a little too when you finally invert the sub.

Yeah box could benefit from more port area as stated above. Box looks good.

Thanks for the compliments!  I'll have to look into making a bigger port for it later on.   10"?

 

My 20 month old son thinks it's HIS new "Burple BOOOFER "

Edited October 11, 201410 yr by dsrt4

LOL, gotta love how little kids say stuff.  Mine are all too big for that kinda stuff anymore.

 

Later on down the road a larger port will require an entire box redesign due to the fact it will have to be larger in size to keep the tuning correct.  It's hard to get ports larger than 6" with the flares which really do help with port noise.  A slot port however would be simpler to design and build without the cost of the port either.  At this point I wouldn't worry that much about it and just enjoy the woofer for now.

This is the biggest box I can fit into the cargo area of my Ford Focus.  There just isn't anymore room. I'll have to make what I have work

 

I have a 8" and a 10" passive radiators I bought years ago .  Wonder if that would help with port noise?  I could stuff one of them into the back side up against the seats?

If that's the biggest box that will fit then you're kinda stuck with what you have and I figured that might be the case when I first mentioned the larger size enclosure.  That's a fairly small car.

 

Passive radiators smaller than the active driver won't work.  They have to be at least the same size and preferably larger in order to be effective.  An 18" PR or a pair of 15" PR's could work, but considering that a PR setup isn't typically as efficient as a standard ported enclosure it's hard to say without doing some modeling whether or not the PR setup would excel over your current enclosure.

 

Even at that I doubt you have enough room on the box for even one 15" PR, let alone two or an 18".

I'll probably just leave it alone and run it as is.  I really didn't hear to much port noise running it with the little fosgate amp running it.

 

A 15 pr would fit next to the FI but I don't want to do that.