Need T-Line Box Design

[Jroo 10+ year member]

how do you figure the size for the chamber loading style? Ive seen several, but the owners could never tell me how they or the designers came up with the size for the chamber?

 

[keep_hope_alive Premium Member]

chamber size

it's mostly trial and error, but i just make the chamber fit the dimensions of the project. for this, the OP can tune with stuffing and 45's.

 

[keep_hope_alive Premium Member]

mean free path is 119.75 inches or a cvnt hair under 10ft. that puts 1/4 wave tuning around 28Hz.

the rear chamber can be made smaller by filling it, and maybe that'll be a way to "tune" to your tastes. a 1/2" lip around the enclosure should be added to leave a carpeting lip.

i made two other versions, one that was 44" wide and another that had an incorrect carpeting lip. final version is below (missing 45's)

 

[keep_hope_alive Premium Member]

there's the carpet lip properly laid out.

 

[keep_hope_alive Premium Member]

TL line width was rounded down to 5" to fit your dimensions. top is not shown but would be 40" x 24", same as the bottom.

 

[tremor1127 10+ year member]

Totally awesome man. Thanks much! I will let you know how it comes out!

If I make the chamber smaller will tuning go up or down?

 

[timhof13 10+ year member]

That's a big box for a 10

 

[keep_hope_alive Premium Member]

Totally awesome man. Thanks much! I will let you know how it comes out!
If I make the chamber smaller will tuning go up or down?

changing the chamber won't affect tuning but instead change how the chamber works with the T-Line. i would put a decent amount of absorption in the chamber which should prevent the chamber from sounding hollow. you can also make the enclosure smaller by adding larger 45's in the chamber. be sure to fill any voids left by the 45's.

 

[keep_hope_alive Premium Member]

That's a big box for a 10

it's a chamber-coupled transmission line enclosure. they are huge. The Loudspeaker Design Cookbook has a decent amount of information on them.

 

[tremor1127 10+ year member]

I have tons of this stuff.

View attachment 26551320

 

[timhof13 10+ year member]

it's a chamber-coupled transmission line enclosure. they are huge. The Loudspeaker Design Cookbook has a decent amount of information on them.

Can you give a quick review of how this differs from a standard 1/4 wave

 

[supra1987]

there's the carpet lip properly laid out.

I'm gonna have to build this next.what would an ideal sub to use in this on 1000-1500 watts?

 

[keep_hope_alive Premium Member]

I'm gonna have to build this next.what would an ideal sub to use in this on 1000-1500 watts?

this is the type i would build next. get the TL output to couple with the woofer output. also, this allows the chamber to transition to the TL better. same dimensions and nearly the same tuning. with this design, you want a woofer with an fs around 28Hz.

 

[keep_hope_alive Premium Member]

Can you give a quick review of how this differs from a standard 1/4 wave

it's not different than a standard 1/4 wave, it's just a version of a 1/4 wave. the challenge is how do you get the woofer output to enter the line effectively. with a shallow woofer you could eliminate the enclosure completely and gain line length which would lower tuning. if you had a 10" shallow sub with a fs around 20Hz, the same dimensions would work with the line the width of the box four times.

 

[LosIsATool 5,000+ posts]

this is the type i would build next. get the TL output to couple with the woofer output. also, this allows the chamber to transition to the TL better. same dimensions and nearly the same tuning. with this design, you want a woofer with an fs around 28Hz.

How would this work. If you say good I'm doing this