Whirlwind EDB1<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Input Impedance: 20k Ohms; Output Impedance: 150 Ohms </span></li><li><span class="a-list-item"> Frequency Response: 20Hz-20kHz ±1dB </span></li><li><span class="a-list-item"> Level Change: -20dB (input to output， pad switch set to zero dB) </span></li><li><span class="a-list-item"> Pad: 3 position， provides 0dB， -20dB， -40dB additional attenuation </span></li><li><span class="a-list-item"> Superb sound quality </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41fjpo96FmL.jpg" noproxy>