Box Build for 2x Pioneer 12's

[tuomas 10+ year member]

Hello everyone, this is my first shot at designing and building an enclosure. I have 2 TS-W1207D4s which are 400w rms.

Current set up:

The box is probably giving about .75 foot^3 per sub...

This is what I have done so far... Please make any comments if you see a mistake I'm not too experienced with BassBox Pro.

Box should come out to about 40" wide 16" high and 15" deep

tuned to about 33.5 hz with a 2.25 inch wide port that runs 11 inches into box. Does it matter if the box does not have a second piece that creates a whole L for hte port?

This graph shows roughly comparison of new box to old box. The new ported box is in orange... old in green.

Click to read more...

 

[Vermithrax 10+ year member]

According to my math and your dimensions that box is 4.02cf internal not including the port.

As long as the box is deep enough to accomodate the legnth of the port + at least the width of the port away from the back wall then there's no need to have an ell. IOW, if your port is 11"L and 2.25"W you need at least 13.25" of depth to avoid the need for the ell. Any less and you would have to have it.

 

[tuomas 10+ year member]

Thanks for the reply. The box comes out to 15 inches deep so 13.5 inches minus 3/4" mdf on both sides. So it should have almost a perfect clearance.

Does bassbox pro put into account the port displacement before it graphs the results?

 

[Vermithrax 10+ year member]

NP. The tuning may likely be a tad lower than 33.5. The port wall is almost the same distance from the back wall as the width of the port. It's possible that the area between the back wall and the end of the port may act as part of the total port legnth, thereby theoretically legnthening the effective port legnth to somewhere around 13.25-14". You can remedy this by decreasing the width and increasing the depth.

 

[tuomas 10+ year member]

Thanks... well should I just build it the way it is or would you close the port and lengthen it a little?

 

[Vermithrax 10+ year member]

It won't hurt anything to build as is, worst case is you get a little lower tuning freq. Probably won't even be audible and not low enough to cause any functionality problems that I can tell.

 

[tuomas 10+ year member]

Thanks for the response, I'm gonna cut the sheets tomorrow hopefully and I'll post pics.

 

[tuomas 10+ year member]

Took a while to getting around to constructing this.

Question: How necessary is the 45 before the port. The area which the 45 degrees will not fall within the "port volume" correct??

When I designed the box I did not include the 45 in the displacement of box volume, or port volume, thinking it was part of box volume and would be negligible.

Picture of 45 in question

Progress:

Another question: Will liquid nails be fine for the seal on the corners or should I shave off what I used to seal and replace it with silicone?

Thanks!

 

[bassman3 10+ year member]

liquid nails for sealing is fine, for gluing, no.

 

[tuomas 10+ year member]

why not for gluing? what would you recommend?

 

[tuomas 10+ year member]

Any answer on the 45? Also if I put in the 45, should the measurement from the corner of the port wall to the middle of the 45 be equal to the port width? Obviously using a 45 instead of a quartercircle with radius of 2.25" is going to result in parts that are wider than 2.25"... thoughts?

 

[BassMechkanic 10+ year member]

why do people use liquid nails? proper wood glue, screws or nails, seal with good caulking - - liquid nails smells real bad, and takes forever to get the smell out of your car!

plus you can pull it apart! (also heard the vapors affect foam surrounds, dont know it to be true but it has been said)

 

[tuomas 10+ year member]

Well it's my first box build, but I appreciate the constructive criticism. I've let the liquidnails dry in every junction for 24hours, so unless vapors form from the pressure they're under during the woofer operation, I don't see a problem.

If someone could comment on the 45 I would appreciate it. A table saw with a tiltable blade isn't exactly accessible in my apartment.

 

[tuomas 10+ year member]

Well I'll be cutting the 45 on friday and it should hopefully be put together by the end of the weekend. I appreciate the suggestions so far and if at all hopefully someone atleast got a design or few ideas from this. I'll post progress pics when finished and a video if anyone is curious.

 

[tuomas 10+ year member]

It's been raining, so the build has been delayed.