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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.

Post Subject: 40Hz - 200Hz and GLARE...Posted by Axel on: 8/10/2009

Hi Saturntube,
40 Hz - 200Hz = wooo, woo, wo, - hm...
Forgive me as I'm not talking about horns right now, but some sort of 4th order *acoustic* roll-off at 200Hz may apply with a horn as it would, e.g. with a second order cross-over in a box-speaker and an 8" woofer. (Woofer here rolls off naturally at ~ 2nd order due to it's construction).

What actually happens: there is still PERCEIVABLE energy at ~ 3kHz, believe it or not - I've tested it.
Now why mention this?
In fact, the woo, woo, woo may contain some perceivable MF/HF energy that becomes an issue with e.g. cross-over components used.
When e.g. trying to "improve" some electrolytic capacitor power-factor, say 220uF in an RCL and using a by-pass cap of only 1uF you can very well throw out your whole midrange presentation! One more example: a 82uF electrolytic with a 0.1uF bypass in the signal path of the woofer cross-over.

Further, this woo, woo, woo, in fact contains MF/HF energy hardly noticeable on it's own, but actually contributing to GLARE (overly bright MF presenation)

This might be common knowledge, who knows - it was not to me and of course NEITHER to simulation programs such as SPICE.
Axel

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