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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s lowest channel.
Post Subject: More about Rotary ULF idea.Posted by Romy the Cat on: 3/18/2011
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There is site out dedicated it infinite baffles subwoofers. I am not sure how serious they are as they use mostly metal in rubber drivers as got thrilled when “Apollo 13 takeoff, my doors move back and forth 1/2", and the  frequency is below 5 hz”. Taken from here:

http://ibsubwoofers.proboards.com/index.cgi?board=general&action=display&thread=8

Still they have a few threes about Rotary ULF idea

http://video.google.ca/videoplay?docid=-7885139890934147401

What particularly interests me was that somebody told:

“Note that there have been other 'rotary' drivers (Tom Danley created one). Bruce's is the first to work in this maner (varying the pitch of rotating group of blades according to frequency) .”

http://ibsubwoofers.proboards.com/index.cgi?board=stuff&action=display&thread=656

I did not know that Danley has a product in ULF world.

I do don’t know if I have an interest in Rotary driver to use in my playback but I am for sure would like to experiment with one. The problem is that this thing might need to have infinite baffle configuration and my house do not have the firmness to handle it.

I have a bass devil-machine with wish I tested the construction of my house. I am taking about Sunfire cube subwoofer that I have. Sonically it is worthless thing but it cap pump insigne amount of LF pressure into the room and to let observe how the room deals with it. If I deal with something like Rotary ULF idea then I would need to do some structural modification in my room – something that I do not look forward to do. Still, if somebody know an example of sensible people with non-barbaric demands and reference in sound who have implemented the Rotary ULF idea then it might be interesting to hear from them.

The Cat

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