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2-Pi towers port freq??? [message #52822]

Mon, 27 October 2008 20:07

Wayne-o
Messages: 225
Registered: May 2009

Master

What is the port freq. of the 2-pi tower? It looks like 50 hz. Thanks

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40Hz [message #52823 is a reply to message #52822]

Mon, 27 October 2008 21:58

Wayne Parham
Messages: 18705
Registered: January 2001

Illuminati (33rd Degree)

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Re: 40Hz [message #52824 is a reply to message #52823]

Mon, 27 October 2008 23:43

Wayne-o
Messages: 225
Registered: May 2009

Master

OK , I guess the program i am using does not take into account for the resonant effect of the tower.

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Re: 40Hz [message #52827 is a reply to message #52824]

Tue, 28 October 2008 12:00

Wayne Parham
Messages: 18705
Registered: January 2001

Illuminati (33rd Degree)

No, it's not that. The driver and port are placed where internal standing wave nodes don't affect response. The Helmholtz resonance would be about 45Hz even without insulation. After insulation is applied, it drops to 40Hz. The insulation is to damp standing waves, mostly to trap midrange energy. But it also tends to lower the Helmholtz resonance as a size effect. Anyway, long story short, cabinet tuning is 40Hz.

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