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qi 6th May 2006 06:17 PM

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I am only guessing here, but this is what I think is going on.

The design is a Mass Loaded Tapered Quarter Wave Pipe (MLTQWP).

It has a single fold with an 18hz tuning (88" x 20" x 18").

Since the access panel for the driver is "mid-ship", the driver "taps-in" with an offset 25% from the start of the pipe.

The rear of the driver "taps-in" with an offset 25% from the mouth.

That's my theory, and I'm sticking to it...

pinkmouse 6th May 2006 06:47 PM


Have you modelled it, or are you still in the conceptual stage?

qi 6th May 2006 07:22 PM

I do not believe it can be modelled yet.

Martin has stated that it is not currently on his "to do" list.

He does say, however, that it can be done (see here) ...

Any ideas / suggestions?

qi 6th May 2006 07:32 PM

I do believe BOXCAD can model this type of enclosure.

At least three forum members have BOXCAD...

Any takers?:worship:

RobWells 6th May 2006 08:07 PM

There's some talk about the tapped horns over at AA hi-eff board


qi 6th May 2006 09:02 PM

Thanks, Rob

Yes -- I did see all that...

qi 6th May 2006 11:27 PM

BTW, Rob, what do you think?

RobWells 6th May 2006 11:50 PM

I dunno!

I've not really been looking at this design - I saw your post about it and posted that I'd seen talk about it on AA.

I've just read the Tom.D white paper

And it's very interesting. However I use a a pair of labhorns in my room, so don't need to be looking at smaller horns. Would be up for building a prototype for fun...


qi 7th May 2006 12:15 AM

Yes, I know.

I have been following your progress with great interest.

This design is by the same guy as your lab-horns (as you well know), but is allegedly the next generation.

According to his marketing blurps (a direct quote from his website)....

"The Tower of Power is simply the most powerful, lowest frequency reproducing subwoofer on the planet"

Hey, I know he is highly regarded on this forum.

Therefore the question begs -- "why is there so little interest in this major new tapped-horn technology?

Is it because the patent is still pending?

RobWells 7th May 2006 12:33 PM

Re -reading the white paper it looks like the tap is working at the higher freq's.

It looks like the horn in the white paper is approx 1/4wl 38Hz horn. the back of the driver will be driving the horn from near the mouth, and drives it at the point where it's 1/2 wl from the throat. Putting the back of the driver near the mouth, say 180cm from the throat will mean the tap will be working at around 95Hz.

This makes sense as the paper says you can drive a 1/4 length horn with a suitable driver, but it won't work at the higher freq's as its not a 'conventional' horn driver. Looks like the tap makes the driver appear more like a conventional one at the higher freqs.


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