Upper Left: Woofer Pedal Speaker (to be installed in north pipe chamber); Lower Left: 10 cubic foot candidate for Pedal Sub Woofer; Right: 20 cubic foot candidate for Sub Woofer. The 20 Cubic Foot Sub Woofer was installed in the North Pipe Chamber.
For the Sub Woofer, Phoenix will selected the lowest volume unit that can handle the 16Hz tones generated by the 32′ Sub Bourdon stop; these tones are well below the lowest frequency handled by any premium audio system.