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RE: How flat can cornerhorns be?

Posted by tomservo (M) on July 6, 2015 at 09:45:41

In Reply to: How flat can cornerhorns be? posted by mdg on July 6, 2015 at 09:08:57:

Hi
In a normal room there is a room gain slope which can be from +12dB per octave in a sealed concrete bunker to more like +3 to +9 dB per octave in a normal house.
This (with a flat a flat response speaker in half space or outdoors) produces a rising response once one is below the lowest room mode which is often associated with the 1/2 wavelength frequency of the largest room dimension.

In an automobile where this effect is easier to see, one can take a sealed box which rolls off around 50Hz at -12dB/oct and when you place it in the car, you can (with windows rolled up) get flat response down an octave or a lot more below the normal corner due to the room gain or cabin gain slope as they often call it in the auto world.
In a sealed car, the +12dB cabin gain slope cancels out the -12dB slope from the speakers roll LF off, perhaps the closest thing to a free lunch in audio

Hope that helps
Tom Danley
Danley Sound Labs


So, since a sealed back horn (including a lab sub) eventually has a -12dB /oct roll off, one might figure out approximately where your lowest room mode would be and then shoot for a horn that has a response knee around that same point.

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