Passive diaphragm
A passive diaphragm works on the same principle as a bass reflex port (mass-spring system). However, it has the advantage that there is no flow noise, which ensures clean sound quality.
ATB20A 20 cm / 8 inch active subwoofer with passive cone
Price not available in your country
ATB20P 20 cm / 8″ under-seat bass active subwoofer 150 W RMS
Price not available in your country
ATB25P 25 cm / 10″ under-seat bass active subwoofer 180 W RMS
Price not available in your country