[nodiak]

Danny would this work ok? I've heard some say TL's have a drop in efficiency vs. the same drivers in BR. Curious about this as I have been looking at A/V-3 and OV-5's. Seems a TL of the same height as the BR cab could be worked out from A/V-3 design. So the OB-5 could maintain it's dimensions, but maybe a deeper bass cab.
Don

[Danny Richie]

You are correct. A TL line box like that used in the A/V-3 could pretty easily be implemented into the OB-5 design.

However, If you are using a sub to handle the bottom octave it might be just as well off as is.

[Daygloworange]

Just off hand Danny, what would the volume of the OB 5 or OB 7 need to be to do a TL for the woofer section? What size difference would there be?

What do you feel the difference in bass quality and room loading would be? I like the way the AV/3's  bass performs in room quite a lot. Probably more so than ported speakers.

As you know, I do have a sub.

Cheers

[Danny Richie]

Just off hand Danny, what would the volume of the OB 5 or OB 7 need to be to do a TL for the woofer section?

The same as the A/V-3 box is fine. You just have to maintain the same port sizing as the A/V-3.

What do you feel the difference in bass quality and room loading would be?

The TL line times the output to take advantage of pressure changes in the box to give more output at the tuning frequency than you get with a port. In this case a little higher output in a little lower range.

[Daygloworange]

Ok, so for the OB 5, it's a more straight forward switch from a ported design. Because I'll be building a hybrid OB 7, with all 4 woofers at the bottom, could a TL design work for the woofer section? Or does it have to be sealed like the original design?

Again, keep in mind I run a subwoofer.

Cheers

[Danny Richie]

With four of them, they'll need to be sealed.

[Daygloworange]

Ok. Thanks.

Cheers

[nodiak]

Danny, as a few discussed in the recent tl thread in the Lab forum they are finding tl's easier to place in a room, avoiding boom of br's. I haven't had a tl for some years and remember them being very smooth in the bass in general, maybe they did avoid some in room bass humps, but I didn't think about that then.
The more I looked and read about the A/V-3 the more I wanted to try a tl again. If i go for OB-5 I think I'd want to try tl loading too. I do use a sealed sub now but am also thinking about trying an mltl sub I have plans for. I might be missing tl type bass without realizing it.
I'm a  couple weeks away from ordering, appreciate the discussion.
Don

[Voncarlos]

What does "TL" and "BL" stand for ???
Carlos

[Danny Richie]

BR stands for bass reflex. TL stands for transmission line.

[tubesurf]

Hi Danny,

I am sure you are busy with all your projects but I wonder if you could put together a TL version OB-5 cabinet drawing on the website.   My OB-5 kit has been ordered and I am interested in a TL version.    I see the AV-3 volume is the same as the OB-5 - would you just maintain the area and length of the TL line in the AV-3 proportioned to the OB-5 dimensions?

Thanks

[klh]

I recall reading a few years back that woofer control in TLs is not as tight? If that's true, would you say 4 sealed M130x's would outperform 2 M130's in a TL (either in a modified OB-5)? What are the trade offs?

[Danny Richie]

Woofer control in a TL line is very good.

would you say 4 sealed M130x's would outperform 2 M130's in a TL (either in a modified OB-5)? What are the trade offs?

4 M-130X woofers would be very tight and controlled for sure. Bass would be really clean and distortion would be really low, but they would not play as low.

[klh]

which begs the question... how low will they go?

[Danny Richie]

The parameters of the M-130X are pretty close to the standard M-130. -3db down points will be in the 55Hz range. Loading them in a TL can extend that some. -3db down points in the low 50's to upper 40's is possible.