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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: Built-in woofers... posted by Bill Fitzmaurice on October 5, 2023 at 11:40:57:
Bill
HornResp is a wonder of the ages, and us audiophiles of the future here can look back at how those in the past struggled. The box volume resonance rule of thumb ignores anything about the driver, or any resonances caused by the geometry of the box, or what frequency the resonance would need to be in order to counteract the effect of the mass of air in the horn to choke off the bass near the lower end of where the horn should be expected to go. Keele's optimum horn mouth math/Sr was criticized on this forum by Tom Danley for typically resulting in a horn which failed to reach a usable high frequency response (which could be a plus in a subwoofer), so he preferred Leach's more complicated math which stressed bandwidth over efficiency. Some time ago on this forum there was speculation on which of these two approaches were used in HornResp, and then it was revealed that HornResp existed in some form before the Keele and Leach AES papers and was derived from Olson's Dynamical Analogies. Back at the '03 Midwest Audio Fest at one of Bruce Edgar's presentations, I asked him what he thought of HornResp. He answered that he had designed a bass horn at one point which had a resonance in the response which he tuned out by just proping the horn up a bit off the floor. He asked David McBean if this could be accounted for in the HornResp program, but he answered that it could not in a one dimensional program like HornResp. Bruce then said that he still uses a calculator to design horns, so from this I have to assume that the Seismic was designed that way. It would be interesting compare details of the Seismic design to another bottom firing subwoofer horn for the JBL 2241 (with similar dimensions to the Seismic), but designed with todays HornResp, which itself has evolved quite a bit during the last 20 years.
Paul
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Follow Ups
- RE: Built-in woofers... - Paul Eizik 10:52:44 10/06/23 (0)
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