Sennheiser HD 650 Open Back Professional Headphone<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Specially designed acoustic silk ensures precision damping over the entire frequency range and helps to reduce THD to an incredible 0.05% </span></li><li><span class="a-list-item"> Improved frequency response is 10 - 39，500 Hz (-10 dB) </span></li><li><span class="a-list-item"> Hand-selected matched driver elements </span></li><li><span class="a-list-item"> High power neodymium magnets deliver maximum efficiency </span></li><li><span class="a-list-item"> Lightweight aluminum voice coils for very fast transient response </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41yMJKBvOVL.jpg"><img src="http://ecx.images-amazon.com/images/I/41eF297ZQVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51XySMdbBOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31ng4yULN0L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51FcgiTlGtL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41YSetzheQL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/71ckkPpKS%2BS.png" noproxy>