Push-pull coupled cavity: Designates a design principle for loudspeakers. There will be two woofer mounted in opposite phase between two chambers. One of the chambers is closed, the other has a bass reflex tube opening. This allows the woofers to operate as if they were built into a much larger enclosure.
This construction principle offers three decisive advantages over conventional construction: 1. deeper bass, 2. improved Performance and higher Efficiency and 3. More precise and distortion-free playback.