Posted by Wayne Parham [ 65.214.102.163 ] on February 23, 2007 at 12:12:36:
In Reply to: Re: Compresison ratio and front chamber size posted by Cuppa Joe on February 22, 2007 at 22:50:52:
The 1970's ten π was a great midbass horn, but it was large. It used a single fold, much like a scoop. Just like my seven π, it was a very simple design. The only downside was it was huge, as big as the 12π basshorn sub.
A conical horn has no more problem with standing waves than any other horn. If the horn is flared in both axis, then standing wave nodes don't set up side to side, like they would in a basshorn having fixed width the whole length of the horn. That's where the problem lies. Basshorns with straight side walls and straight passages inside can develop standing waves along those dimensions if they're used up to high enough frequency. So it's not the expansion rate that causes notches in response, it's the constant width of the pathways, in a cabinet so constructed. If the horn isn't used to high frequency where the first standing wave node causes a notch, it's not a problem. Most basshorns are used only at low frequency, so straight side walls don't matter. But if used high enough, they'll cause notches in response.
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