Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
The 40Hz recommendation for the cabinet is one that assures flat response for the system. As far as cabinet size is concerned, the larger you go the deeper your lowest bass notes will be. At 1.5ft3, your cutoff is around 60Hz and at 5ft3, it's 35Hz. Any larger or smaller and the cabinet becomes underdamped at this Helmholtz frequency, so you'll notice a peak in response.
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