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In the Forum: Horn-Loaded Speakers
In the Thread: Mitigating Undesired High Freqs in Midbass Horns

Post Subject: Mitigating Undesired High Freqs in Midbass HornsPosted by skushino on: 6/30/2010

One of the challenges I see for my midbass horns is to minimize hf output. The goal is to operate the horn in a bandwidth where it can cross to the higher horns, and have each horn function in their best sounding manner. My drivers are Altec 515-16Gs, and they will cross to the upper bass around 200 - 240hz. There are three options under consideration, in order of preference:

1) aim off axis - unlike the main horns which are aimed behind the listening seat, aim the midbass horn straight back. this should allow the 'beamy' hf to shoot straight past the listening position.

2) hf absorbing liner - I was wondering if anyone tried lining the inside of the horn with a material with high coefficient of hf absorption? Perhaps something like a thick, luxurious velvet liner. Imagine an entire listening room lined with velvet or something similar. In my mind that room will sound very dead, because the hf is being swallowed by the textured material. If you have tried this, did it work?

3) higher order low pass crossover - this should help to control the output, but has all the downsides of high order crossovers on phasing.

I'm most interested in learning if anyone has tried lining their horns with an hf absorbing material, and your results.

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