Ultrasone HFI-580 S-Logic Surround Sound Professional Closed-back Headphones with Transport Bag<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> S-Logic Natural Surround Sound Plus </span></li><li><span class="a-list-item"> Dynamic principle </span></li><li><span class="a-list-item"> Frequency range 10-22.000 Hz </span></li><li><span class="a-list-item"> Impedance 32 Ohm </span></li><li><span class="a-list-item"> Sound pressure level 101 dB </span></li><li><span class="a-list-item"> S-Logic(TM) Natural Surround Sound for a more natural， lifelike sound </span></li><li><span class="a-list-item"> Safer listening， less fatigue - SPL levels to the ear drum are decreased by up to 40% (3-4dB) for the same perceived loudness </span></li></ul><!--   Loading EDP related metadata  --><div aria-live="polite" class="a-row a-expander-container a-expander-inline-container"><div aria-expanded="false" class="a-expander-content a-expander-extend-content" style="display: none;"><ul class="a-unordered-list a-vertical a-spacing-none"><li><span class="a-list-item">ULE technology with MU Metal shielding to reduce radiation by up to 98% as compared to ordinary headphones</span></li><li><span class="a-list-item">50mm professional durable Mylar driver provides high volumes and superb isolation</span></li><li><span class="a-list-item">1/8 inch gold plated plug， gold plated screw adaptor， demo CD， and carry bag included</span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41A%2BPYxL1BL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51iXczTkGrL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51b1bWJxUrL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41U%2BDRhJSlL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/0189TLtdcES.png" noproxy></div></div>