To get just the bass sounds, the woofer uses aluminium in its cone structure. Lightweight and highly stiff, aluminium cones transmit precise sound vibrations to the edge of the diaphragm 3 times faster. The end result is ditortion-free and better response sounds even at high volumes. aluminium cones also stand even at high volumes. Aluminium cones also stand up better to heat and moisture and as such deliver higher power handling capability.