Pro-Ject Audio - Stereo Box S - Black<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Output power 2 x 20W/30W @ 8 Ohm/4 Ohm (both channels driven) </span></li><li><span class="a-list-item"> Frequency response 5Hz - 20kHz (+ 0dB， - 0，5dB) </span></li><li><span class="a-list-item"> Channel separation&gt; 40dB @ 20kHz </span></li><li><span class="a-list-item"> Signal to noise ratio&gt; -100dB (IEC -A) </span></li><li><span class="a-list-item"> Input impedance 20k ohm s </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31JPfhY09GL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41WqJGz3HIL.jpg" noproxy>