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jp wrote:

I assume a simple hole sealed with silicone would not suffice given the amount of pressure build up in the rear chamber?

The pressure that builds up in right rear chamber is truly enormous.

jessie.dazzle wrote:

… adjusting chamber volume will not be as convenient as turning a threaded shaft, but once the correct volume is found, you're done.

Even when we are talking in context of one non-changeable driver it opens up a ground for a great discussion: what happen when the resonance of chambered driver and mouth rate “almost” match? We have a few variables: the type of the driver and the location of the horn in the room. It is easy to measure where the Fs of chambered driver sits in relation to the horn’s rate. However no one ever told about what happen with Sound when the Fs ascend for ½ hertz. It might be that the precision in it is not important at all but it also might be that a very precise dialing of Fs creates some interesting sonic benefit. How, that “precise dialing” might be changed by driver or by position of the horn relative the back wall only God knows.

Sure, the “smart” people use the HornResp… :-)

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