Tube sub idea

[Saturnus]

Here's an idea I've been pondering if anyone has tried out, or can see any reason why it shouldn't work.

Basically it's the old sonotube based sub again but with a twist. For years, people have put large woofers into sonotubes of various lengths, either for the shorter versions to function as a baffle for dipole subs or for the longer versions to function as transmission lines.

Now, what happens if I calculate the volume as a BR cabinet and then make the port the same diameter as the tube and add the port volume to the length? It should theoretically still work as a BR, right?

And couldn't you just recess it in the tube, and calculate it as a BP making both ports the same diameter as the tube itself. Again, it should theoretically work, right?

I'm hoping someone can argue the flaw in my assumptions, or has any practical knowledge about it.

[richie00boy]

It should work but your sub will be as tall as your house.

[Saturnus]

That would depend on the driver and the desired tuning though, so that's acceptable.

[NEO Dan]

You get a Bose Acoustic Wave Cannon

[Saturnus]

Interesting.

Of course, the "patented" part means nothing. Anyone can produce it legally, it's a void patent. But Bose does have some interesting ideas sometimes. That they truly crap at making any good use of any of them is another matter.

If the concept holds true it would actually be very interesting to try with a quality 15" driver in 6 meter long tube.

[NEO Dan]

Even Boes dropped the product from the line....

[Saturnus]

That probably because an almost 4 meter long and over 30 cm in diameter tube, weighing in at about 35 kilos isn't the most sellable product for the average consumer crowd they aim at.

But thanks for confirming that it was a really really good idea for a subwoofer project. It's basically what I predicted. Very wide frequency possible range that can go very low, and with next to no distortion as the only distortion will be from the driver itself, and not the cabinet tuning used.

[NEO Dan]

It was a commercial product, the one that I heard was at a place I used to work at, it was hung from the ceiling.

Have you read The Legend of EL PIPE-O?

[Saturnus]

Originally Posted by NEO Dan

Have you read The Legend of EL PIPE-O?

Of course, that's not what I was aiming at though. That's not really interesting as it's just loading seveal 18"/21" woofer into a (too short) transmission line. Not a clever solution at all.

[NEO Dan]

Originally Posted by Saturnus

woofer into a (too short) transmission line. Not a clever solution at all.

So what application do you have in mind then?