What is the Bass Reflex?
The bass reflex is a speaker design technique that uses a duct (tube) or an opening (port) to improve the reproduction of low frequencies.
It harnesses the rear sound energy of the woofer, increasing its efficiency, sound pressure level and low-frequency extension compared to a sealed enclosure.
Paolo Viappiani describes it as pure acoustic physics: the woofer generates low frequencies, but the internal tube acts as a ‘megaphone’ that amplifies them by +3–6dB between 40–80Hz. When the cone moves inwards, the compressed air exits the tube in opposite phase, reinforcing the deep bass without straining the cone.
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