Abstract: A tube-annexed speaker cabinet has a connecting device disposed on an opening at the bottom wall. A tube assembly which composes of one or more than one tubes engages with the connecting device. The other end of tube assembly engages with a pedestal which is a platform or a hollow box to support the cabinet from falling. A venting hole is optionally disposed on the bottom wall and each said wall of the hollow box and on the tube assembly respectively. A horizontal platform and a friction pad are disposed on the upper end of tube assembly to hold the cabinet. Tube assembly and pedestal box expands the volume of cabinet. Speaker cabinet can also be disposed on the rear shelf of car trunk with tube assembly extending downward into the trunk. The bottom wall of tube assembly is close or has a venting hole formed therein. Thus forming an increase interior volume of speaker cabinet to generate better resonant effect.