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In Reply to: RE: Spiral Bass Super Horn posted by Mr_Steady on November 16, 2014 at 10:40:45
This thing looks beautiful, but down to 20 Hz?!!! I don't think so.
Follow Ups:
Hi Ed,You are welcome to show a pic of your J horn if you have one.
"This thing looks beautiful, but down to 20 Hz?!!! I don't think so."
JoshK-"didn't do the math or sim it, but I imagine he gets a lot of room gain below the first room mode. Above the first room mode I'd be more inclined to agree with your skepticism. "
From Inlow Sound;
"Observing the ACI (blue, white, and grey) graph and my white graph, above, it becomes obvious that the wattage requirements at 20hz far outweigh the higher frequencies. Still, 20hz is doable. My calculations indicate that roughly 75 watts are required to achieve 99.2 db at 20hz. (this was measured 14 feet from the mouth of the horn). Things improve dramatically at 30hz. 13 watts gets us on par with the 20hz SPL level. At 40hz, only 6 watts are necessary.
When the 14 foot distance to the horn is halved twice, the calculated SPL becomes 112 db 1 watt/1 meter. At 20 hz, that's pretty impressive SPL for 75 watts of power."
Bill Fitzmaurice wrote in 2012;
"Sensitivity. You can trade sensitivity for low frequency extension and vis-versa. "
That explains it all.
Jamie
Edit I added the cite for BF.
Big speakers and little amps blew my mind!
Edits: 11/17/14
I don't BS. The graphs are on my web site.
John is using two together, so that their mouth couples. And it is a 25hz exponential design.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
1/8 size?
didn't do the math or sim it, but I imagine he gets a lot of room gain below the first room mode. Above the first room mode I'd be more inclined to agree with your skepticism.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
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