Resultant/accoustic question

[Contratrombone64]

having just read about the reason the gravissima is why it is (two sets of pipes side-by-side producing a different frequency) either 32' or more rarely 64'.

Then I thought about the closed stop being half the length of its pipe length indicator (stopped diapason 16' being actually only 8' in length) AND I pondered why it isn't "done" to make a 64' stop that is a stopped 32' ... there must be a reason.

I could also being totally missing the point!!

[Corno Dolce]

Hi CT64,

Good question you ask dear colleague. Generally speaking, methinks that a stopped 32' is quite expensive although not as much as a full length 64'. Heck, why not a stopped 64' Bourdon which will emit a sound wave that beats at four cycles/sec?

That would be a 128' Resultant. For 64' and 128' you need a room of sufficient size to acheive the desired effect - a rolling rumble! Of course, one could simulate a large room electronically, add the 64' or 128' and let 'er rip. I have this notion that a 64' stop needs a room length of about 128' to be effective.

Cheers,

Corno Dolce

[Contratrombone64]

... generally speaking ... a stopped 32' is quite espensive ... indeed but not nearly as expensive as producing a "true" 64' stop, surely?

As to a 128' stop ... the neighbourhood dogs would go mad.

[Corno Dolce]

Hello CT64,

Yes, absolutely dear sir. Dogs generally are placid at lower frequencies. However, they will yap and yowl when high frequencies excite their auditory nerves.

There are those dog whistles which we humans don't hear but dogs respond and bats start doing cartwheels around your head when you blast them at dusk. I've heard this rumor that the Flying Foxes in Australia will attack a human who blasts a dog whistle - any truth to that?

Cheers,

Corno Dolce

[Contratrombone64]

Flying Foxes have sharp teeth AND I don't have a dog whistle, thankfully!!

[Caddis]

A stopped 64' Bourdon,that is quite a lot of sound.I think a stopped 64' Contre Bombarde would sound awesome.