Jerry and his 2012 Mazda 5
I have been told than a speakers resistance in a ported enclosure is lowest at the speakers free air resonance. Can anyone confirm and elaborate? If this is true, box tuning to this resonance frequency lowers the "seen" resistance in the amp? Can this be calculated and used to SPL advantage or will this just fry amps and woofers?
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ShadowStar
The system resistance of a ported box Fc is lowest at the system resonance. It is never lower than the DC resistance of the voice coil, and usually slightly higher.

The speaker's free air resonance Fs is the point of maximum resistance, and in ported enclosures tuned so that Fc is below Fs, is generally lowered in frequency and the magnitude of the impedance peak is raised slightly.

Short answer: won't fry, won't help.

ShadowStar
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