Bandpass designs

[Robert 2001 10+ year member]

Slot port on ends of box

 

[duanebro 10+ year member]

As far as Band pass, this is what I have so far:

The dotted line in the center are where the drivers go. I would angle these "walls" to make installing the subs easier. I did them strait to get the volume of the chambers correct first. The ports on the end are full height slot ports.

 

[duanebro 10+ year member]

I'd use aero ports for the box you're building. Or square, if you use the whole height of the box for a slot port it will be really skinny or long.

fwiw 6"x 2" x 21.5" port is .22cf. 32hz box 1.3cf net

 

[Robert 2001 10+ year member]

Could use like half of the height on the side or whwwatever skinny would make alot of noise was thinkin lik 3x7 port but not sure on length for tuning. What is the depth on that box

 

[TurboRedneck 10+ year member]

Curious, what are you calling an "aero" port?...aka round? If so, they will cover design flaws on parallel side...rectangular boxes. Poking one in wherever you want never seems to pickup standing waves and works ok every time. However in my experiences a wooden slot port on a rectangular box have the possibility of being quiet if the ratios of W x L x H are not correct. Instead of memorizing the formula I angle a side. Usually it fits the vehicle better, picks up some lost cubic inches, and more visually appealing with an angled side too.

A slot port working in a rectangular box is a craps shoot but in the builders favor. Probably 7 of 8 will out perform a round port, so you've got good odds.

Remember to radius All corners of the port, Inside & out. So many skimp on the details, may as well bought a lesser quality sub.

Disturbed, congrats! You are not a redneck. Its ok, not everyone can be perfect. hehehe

 

[duanebro 10+ year member]

Could use like half of the height on the side or whwwatever skinny would make alot of noise was thinkin lik 3x7 port but not sure on length for tuning. What is the depth on that box

The depth of the box is 12.5'.

I knew I needed to post that too!

6"x 2" x 21.5" port is .22cf. 32hz box 1.3cf net

 

[duanebro 10+ year member]

Curious, what are you calling an "aero" port?...aka round? If so, they will cover design flaws on parallel side...rectangular boxes. Poking one in wherever you want never seems to pickup standing waves and works ok every time. However in my experiences a wooden slot port on a rectangular box have the possibility of being quiet if the ratios of W x L x H are not correct. Instead of memorizing the formula I angle a side. Usually it fits the vehicle better, picks up some lost cubic inches, and more visually appealing with an angled side too.
A slot port working in a rectangular box is a craps shoot but in the builders favor. Probably 7 of 8 will out perform a round port, so you've got good odds.

Remember to radius All corners of the port, Inside & out. So many skimp on the details, may as well bought a lesser quality sub.

Disturbed, congrats! You are not a redneck. Its ok, not everyone can be perfect. hehehe

Yes round, I thought that the golden ratio didn't make a difference if the wave lengths are longer than the box. This could be a problem in big boxes and full range speakers. (home audio mainly) If you get into very long boxes WinISD is off. It is a limit of the software. I have to have someone else model tower speakers for my house do to that.

And yes all corners need to be rounded, and I always flare the ends of the ports also. It helps a bit and looks nice.

 

[Robert 2001 10+ year member]

Still debating on what to do really want to do bp trying to draw A 3d of the bp done it seems a little smaller than the ported doees that seem right?

 

[duanebro 10+ year member]

Still debating on what to do really want to do bp trying to draw A 3d of the bp done it seems a little smaller than the ported doees that seem right?

It is smaller about 2.4-2.5cf, net. I designed it to try to give a fr of a sealed box, just louder. I had to keep the sealed part small to increase power handling. Then the ported chambers were sized to give me the fr I was going for.

 

[duanebro 10+ year member]

as for what box to make - both! Try them out to see what you you like, and let me know what you like about both boxes, plus the sealed one too. If you go with the bp, throw the cvr 10s in the ported and sell it. (I don't think they will work as well in the bp box.)

 

[Robert 2001 10+ year member]

I think ive made my mind up to do a ported instead of the bp at the moment may build the bp box if im not happy with output. Measurements 36 1/4 x 14 x 13. Port 14x1x11.44 for 32hz tuning sub disp .085 with a center divider box ends up 2.77 cu ft does this sound about right

? Opinions pls.

 

[duanebro 10+ year member]

oops, I didn't look at where I was posting. I said the wrong thing. Sorry.

 

[TurboRedneck 10+ year member]

I think ive made my mind up to do a ported instead of the bp at the moment may build the bp box if im not happy with output. Measurements 36 1/4 x 14 x 13. Port 14x1x11.44 for 32hz tuning sub disp .085 with a center divider box ends up 2.77 cu ft does this sound about right? Opinions pls.

Your numbers are all within 10% of a box I'm very pleased with for CV 15's I did a couple weeks ago. I say let the wood fly, solid design.