Owners Manual
Page 15
... between the speaker cabinet volume and port, it creates more stable performance and clear bass reproduction without any murkiness. Yamaha's newly developed Advanced YST II adds many refinements to give powerful, high quality bass reproduction. Yamaha developed a new circuit design combining negative-impedance and constant-current drives, which provides a more resonant energy (the "air woofer...
... between the speaker cabinet volume and port, it creates more stable performance and clear bass reproduction without any murkiness. Yamaha's newly developed Advanced YST II adds many refinements to give powerful, high quality bass reproduction. Yamaha developed a new circuit design combining negative-impedance and constant-current drives, which provides a more resonant energy (the "air woofer...