_:n8ff90fdef09340e1a32529605c46035exb0
<http://schema.org/description>
"With Advanced YST technology to help ensure the highest levels of sound pressure and overall performance.With  QD-Bass (Quatre Dispersion Bass) technology which uses down-firing drivers with square, pyramid-shaped reflective plates to radiate the sound efficiently in four horizontal directions"
<https://jkalachand.com/yamaha-subwoofer-system-yst-sw015-piano.html>