Below resonance, the reflex system backs off on loading the active driver, yet still moves quite a bit. But since it is merely venting the back-pressure instead of "cracking the whip," it's no more than a hole in the baffle, which causes cancellation with the active driver's front output. Because of this, the output rolls off very steeply, at 24 dB per octave (over 200 times less output per halving of frequency.) Also, since the port does not limit excursion and the suspension force that would have been provided by the compliance of air in a sealed system doesn't exist because of the “leak” in the enclosure, the active driver can very easily “bottom out,” or smack itself into itself, below that tuned frequency.
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