Tom Danley's TOWER OF POWER - diyAudio
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Old 6th May 2006, 06:17 PM   #1
qi is offline qi
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Default Tom Danley's TOWER OF POWER

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...
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Old 6th May 2006, 06:47 PM   #2
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Interesting.

Have you modelled it, or are you still in the conceptual stage?
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Old 6th May 2006, 07:22 PM   #3
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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) ...

http://www.diyaudio.com/forums/showt...165#post879165

Any ideas / suggestions?
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Old 6th May 2006, 07:32 PM   #4
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I do believe BOXCAD can model this type of enclosure.

At least three forum members have BOXCAD...

Any takers?
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Old 6th May 2006, 08:07 PM   #5
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There's some talk about the tapped horns over at AA hi-eff board

http://www.audioasylum.com/forums/hu...es/106681.html


Rob.
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Old 6th May 2006, 09:02 PM   #6
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Thanks, Rob

Yes -- I did see all that...
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Old 6th May 2006, 11:27 PM   #7
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BTW, Rob, what do you think?
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Old 6th May 2006, 11:50 PM   #8
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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

http://www.danleysoundlabs.com/pdf/danley_tapped.pdf

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...

Rob
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Old 7th May 2006, 12:15 AM   #9
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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?
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Old 7th May 2006, 12:33 PM   #10
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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.

Rob.
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