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Old 20th November 2014, 05:01 PM   #1
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Unhappy Help with a port length, A7.3

I've knocked up some boxes for a pair of A7's, the dimensions were decided upon due to where they are going and available ply I have.

Internal dimensions h x w x d

410x165x280 = a little shy of 19L

Driver placed 70mm from top inner surface.

I had planned to use some online software to work out a vent or port size, tuning box to to around 50hz. I have some ports 35mm internal diameter.

Problem is, each software I load the info into gives me wildly different information about the port length

Is there a trusted software for this sort of thing? And/or some good rules of thumb about where to place the port?

Many thanks for any pointers.
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