Tom Danley's TOWER OF POWER

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"Interesting, I just assumed it was the same as the Contrabass."

It is, just the nomenclature is different. In the blurb on the Contrabass since it is a vented direct radiator system the vent substitutes are 18" passive radiators and the 15" passive radiators driven by the S shaped belt are called 'the active radiators'.
 
Hmm, I guess I can't 'see the forest for the trees' because I'm looking at an assembled CB belt drive system and I wouldn't describe the belt drive as 'S' shaped or the stabilizer belt system as idler pulleys.

Oh well, it's academic since Don's posted something with a drawing of it. Thanks for clarifying the BT7 uses the same system if not the same parts.

GM
 
DTS20 -- the actual design...

...from the patent (page 25)

It is tri-fold -- appox 205"

The driver "taps in" at the beginning of the horn (0% offset)

The driver "taps out" 20% from the undersized mouth
 

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