box for two dd 1008's

[Immacomputer 10+ year member]

That puts the tuning around 60hz if it was a true TL. It doesn't appear to be so because of the front chamber being wider than the actual line. It looks like a pressure chamber before the line which will have an affect on the actual tuning frequency. So really, I don't know either.

I would assume that as you go below the transmission line's tuning, the line would act more like a port and you would have them in more of a lower tuned enclosure. That's probably why he called it a bass reflex/TL enclosure.

 

[blackonblacksls 10+ year member]

That puts the tuning around 60hz if it was a true TL. It doesn't appear to be so because of the front chamber being wider than the actual line. It looks like a pressure chamber before the line which will have an affect on the actual tuning frequency. So really, I don't know either.
I would assume that as you go below the transmission line's tuning, the line would act more like a port and you would have them in more of a lower tuned enclosure. That's probably why he called it a bass reflex/TL enclosure.

yes, well im hoping it has noticably more output than a normal low tuned ported box. do you know what a bass reflex box is, or how its design is used here.

 

[duece212 5,000+ posts]

yes, well im hoping it has noticably more output than a normal low tuned ported box. do you know what a bass reflex box is, or how its design is used here.

Bass reflex is just a ported box if I'm not mistaken.

And I think what is trying to be attained here is when you adjust the volume of a port and therefore the length of the port in a bass reflex box you can get the length to match that of a transmission line, which could give you better control over the woofer.

All just guesses here though...I'm a dumb bastard when it comes to enclosures.