for keeping the voice coils 17 centered in the gap of the magnetic structure 19 the woofer 11 is as noted previously operated in an acoustic suspension mode i e the speaker is mounted in an opening in an acoustically sealed chamber so that the air within the chamber provides a substantial portion of the dynamic restoring force for the cone 15 as opposed to the usual arrangement however where the basket and cone extend into the chamber from the chamber opening the arrangement of the present invention provides that the basket and cone extend outwardly from the opening further the opening is on top of the acoustic suspension chamber rather than extending through a sidewall thereof and the chamber provides a base for the overall speaker system in the embodiment illustrated the chamber is formed by a box like structure 39 which provides the support for most of the other components of the overall speaker system as is conventional the box like structure 39 may be largely filled with acoustic fiberglass to provide suitable damping for appearance purposes a recessed base may be provided as indicated at 41 as will be understood by those skilled in the art movement of the cone 15 at audio frequencies can cause radiation from both the front face and the back surface of the cone as the dimensions of the speaker system will typically be small as compared with the wavelengths of acoustic waves over the lower audio frequency range e g 20 to 200 cycles per.