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RE: What happens if...

By placing straight-sided extensions on the horn, you're strongly controlling polars in that direction to a lower frequency (the point that I believe is so important not to mix with "cut-off point" in listening trials) and weakly extending the 1/4 wavelength cut-off frequency...since the vertical direction of the horn isn't extended axially along with the sides.

I believe that most people haven't heard the effects of controlling polars to a lower frequency. It sounds just like what you describe.

If you were to extend both the vertical and horizontal mouth exit angles (which is an issue with the horn you've got because the exit angle vertically looks to be 90 degrees), then you'd be playing with both its polar control high pass point and its 1/4 wavelength horn gain high pass point.

If you want to extend the mouth on the horn you've got, note that you're going to take a bit of a hit at the 1/4 wavelength axial length point corresponding to the "cut-off frequency" as-is...in gain and in impedance bounces below the as-built cut-off frequency. You'll need to change the vertical exit angle to be significantly less than 90 degrees to measurably lower its cut-off frequency.

"As far as the ear can tell, consistently clean and spacious bass can be reproduced only by a driver unit coupled to a horn-type acoustic transformer..."; Jack Dinsdale, May 1974

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  • RE: What happens if... - Cask05 09:01:08 04/25/17 (0)


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