I got my Crackheadphones and I am really blown away. Running my Crack amp with my Beyer DT880 Premiums is a great listen, but when I did my side by side comparison, I ended up wanting to wear the Crackheadphones the rest of the day. The lower end on these is simply amazing. Deep and smooth natural bass you can really feel with no distortion when cranked to "11". Full mids, and the top end is smooth and balanced, making for great extended listening. Anyone with a Crack amp should really check these out.