Abstract: The system consists of 2 large speakers (1A & 1B), and 2 small full range speakers (2A & 2B) having about half the active cone area as the large speakers, mounted in a dual chamber enclosure (3) with the large speaker (1A) mounted on an internal baffle (4) forming a partition for a large bass reflex chamber (3A), with the large speaker (1B) mounted in common direction thereto immediately in front thereof together with the 2 smaller speakers (2A & 2B) mounted adjacent thereto on a front baffle (7) forming a small tympanic chamber (3B) by and with the large speakers (1A & 1B) and small speaker (2B) electrically connected to operate in common acoustic phase to each other with the other small speaker (2A) connected to operate in opposing phase thereto.