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drboar

La Scala with Internal Helmholtz Resonators

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I have seen other horns (Jericho 08) that use a small internal helmholtz resonance chamber to flatten the horn response. Outside the first flare section between the dog house and the back wall there are two unused closed spaces. Have anyone tried to use them as IHR and reduce the LS peak at about 150 Hz?

In a PA setting it would make more sense to EQ it and keep the radiation resistance but in a domestic setting, why not trying to tame the peak?

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The materials and time required for Helmholtz and other enclosure "cut and try" techniques is really more about hobbying and less about "which is better" or more economical, IMHO.

On the other hand, Helmholtz resonators aren't as affected by thermal heating as are passive electrical networks (IMHE) although they aren't immune from heating/temperature related property changes. As you have alluded to, the advantage of a Helmholtz resonator is usually about dealing with relatively high-Q resonances by resistive means (in this case, acoustic resistance). Using one or more of these in an enclosure/horn to correct for horn/driver acoustic response is novel.

Active digital crossovers are pretty good and about the cost of good discrete crossovers (i.e., used actives), they can also correct for EQ, time delay in midrange and bass horns (relative to tweeter), offer thermally stable crossover filters, easy to dial-in/change settings, reuse from project to project over long project time spans, and offer much more effective power to your loudspeaker drivers/horns than passive crossover networks or even Helmholtz resonators.

JM2C.

Edited by Chris A

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The Jericho 08 IHR is a 50mm hole into a chamber. No vent tube or anyhing fancy just a drilled hole so something simlar in LC seems feasable

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Digital active correction is a better solution than any analog derived method, acoustic or otherwise. LotsamodernBITS are CHEAP and GOOD!!

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It been my impression and experience the 150-ish Hz resonance in a La Scala is the vibration of the sidewalls, especially near the mouth. Why not just add braces?

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The outer walls. The doghouse walls are smaller and pretty well contained. The sidewall mouth is rather large.

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