Yamaha NS-SW210BL Advanced YST II Subwoofer (Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Elegant Yamaha Piano Black finish， plus choice of three other finishes to match diverse interior </span></li><li><span class="a-list-item"> Advanced YST II (Yamaha Active Servo Technology II) </span></li><li><span class="a-list-item"> Linear Port for smoother bass with less unwanted noise </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41P-b89WAaL.jpg" noproxy>