Yamaha KS-SW100 Subwoofer for PSR-SX and PSR-EW Keyboards Type_Acoustic while the USA version is

while the USA version is ideal for those who value the classic appearance and format

while true bypass and standard external-power compatibility make it easy to incorporate into a modern setup

Choose the USA model for traditional simplicity

Can it run from a battery

Yamaha KS-SW100 Subwoofer for PSR-SX and PSR-EW Keyboards Type_Acoustic while the USA version isThis compact subwoofer incorporates a number of Yamahas advanced, high performance bass technologies, including Twisted Flare Port and Advanced YST II (Yamaha Active Servo Technology II) This results in sensational bass response that adds significantly to the enjoyment of music performance. Subwoofer suitable for Keyboard instruments New Twisted Flare Port contributes to clear and tight bass Advanced YST II (Yamaha Active Servo Technology II) 20 cm