Yamaha YST-FSW050BL2 Subwoofer (Each， Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Rack mountable design </span></li><li><span class="a-list-item"> Advanced YST (Yamaha Active Servo Technology II) </span></li><li><span class="a-list-item"> Down-firing active design </span></li><li><span class="a-list-item"> High 100W dynamic power </span></li><li><span class="a-list-item"> Linear port for minimizing extraneous noise </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31xlNCzqqFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31ep%2B%2BskrAL.jpg" noproxy>