Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
The seven π midhorn is designed to use a rear chamber larger than 0.5ft3, which is large enough to act pretty much like there is no rear chamber at all. The resonance of the rear chamber is shifted down out of the passband. This gives a slower more gradual rolloff at low frequencies.
The 9π midhorn (and its midbass horn) both have rear chambers sized specifically to peak near the lower cutoff of the horn. This is called reactance anulling, and it works something like the vent of a bass reflex cabinet. The rear chamber and driver system is tuned to peak at a low frequency where response would otherwise dip.
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