LOGITECH Z506 5.1 SURROUND SPEAKERS [75W] New Item!
75 watts (RMS) of power Ported, down-firing subwoofer
Surround sound with 3D Stereo Multiple inputs
Dedicated bass control
 
You can purchase from 
https://www.carousell.sg/p/logitech-z506-5-1-surround-speakers-75w-1042678049/?t-id=hln6RVXCej_1604372663077&t-referrer_request_id=35QZdcXXz-5LCxaj