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In the Forum: Horn-Loaded Speakers
In the Thread: The Macondo’s Upper Bass Channel: what is next?
Post Subject: Ooopsy back chambersPosted by op.9 on: 11/2/2007
"It is not an accident that I liked the article about the “Resonating Oops” to this thread."

Interesting. I'm just completing my 125hz midbass horns. And I'm deciding how to construct the back chamber. I think I will experiment with a removable and tunable back panel of the back chamber. I will tune the chamber first with a stiff panel then I'll ask my Luthier freind to help make a nice pingy, springy, lively back panel (probably with a 'bass bar' - the important structural bar under the table of a violin) out of some nice laqured spruce (2mm-4mm thick). We could start with a flat panel but it would be interesting to try an arched panel too. My hunch is that I need quite some surface area - maybe more like a large viola size than a violin. Possibly even bigger. I think I will make the back chamber elipitcal rather than circular. More worl.. but more room for experiment then.
I'd be interested if anyone has any ideas about all this... Its all a bit of a leap of faith! Anyhow if its a disater I can always replace the panel with something conventional.

BTW, against my better judgement I made the horns exponential... I couldn't decide whether to do exp or lecleach, so in the end I flipped a coin. I could always make them again ... noooo!

I'm planning to use Precision Devices PR107 drivers (they sound delightfully lively outside a horn) but I'm fascinated about the idea of the A45 lowther - has anyone actually tried them in a 125hz roundhorn?

cheers to all
op.9


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