However some positions do result in what sounds like cancellation, such as having theh subbox face right up towards the front wall of the trunk with the drivers firing into the wall. However it doesnt seem that phase cancellation could be the source for this issue - anyone know what could cause this in the trunk?

If you're using a pair of subs, you might get an oscilloscope and see if the signals sent to the two are phased. I used to enjoy using the left and right channels to generate Lissajou patterns and I was surprised how many recordings had bass with content phased more than 90o between channels. If your signals are already phased 135o then the distances to create a 180o shift are smaller. And in a small space, two sound sources would be tightly coupled and highly combinative.

Wayne

That makes sense, good point. Crossover filters etc also add additional phase shift, so I'd guess these would also mean distances to create destructive phase shifts are smaller.

Adrian

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