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Multi-Way Conventional loudspeakers with crossovers

Simple question on multiple port lengths
Simple question on multiple port lengths
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Old 17th January 2003, 09:13 AM   #1
Dave Bullet is offline Dave Bullet  New Zealand
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Join Date: Jan 2002
Location: Wellington, New Zealand
Default Simple question on multiple port lengths

Assuming the following equation gives the length port(s) in metric:
Lv = (23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv)
(dv=diameter)

Does that mean Lv =
a) the total length of all ports?
or
b) the required length of each port?

eg. if Np=1 and Lv = 45cm for a given Fb, Vb and Dv, but the equation = 97cm when Np=2.... Does that mean each port should = 97cm in length? - or each port should add up to a total length of 97cm?

Also.... does each port have to be the same length (eg - could one be 60cm and the other 37cm - assuming the same diameter)?

Yours in simple minded confusion,
Dave.
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Old 17th January 2003, 11:10 AM   #2
audioPON is offline audioPON
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Join Date: Sep 2002
Location: Norway
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I'm not sure about your first qestion, but it looks like it would be the lenght of each port.

Each port needs to be the same length.
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