Report Headphone impedance and amplifier in Music Composition & Production Posted May 17, 2013 I was also looking at the AKG K701's. What do you like/dislike most about those? I was looking for a second set of headphones and bought the Q701s after 8 years with these if that says anything. The are crystal clear, I can tell exactly where in a mix things are off. Many people consider them to be bass shy, but I find that they just are not bass heavy. You can hear a 30Hz hit just fine, on some systems which push more EQ into the low frequencies, they seem shy, but they match up with my monitoring set up well, which is within 3db from 26Hz - 20kHZ+. My only real complaint is that there is a break in period. I never believed it when I bought my K701s, but when I bought my Q701s which are supposed to be the exact same headphone, they sounded different to me. I let them play for about a week without listening and they suddenly were in line with the K701s. They are harder to drive than the specs would suggest. But I have driven them with everything from my mixing board to high end headphone amps over the years (Schiit Lyr, Meier Aria, Peachtree Decco). They do sound slightly better on the Lyr or Decco, but you are well beyond diminishing returns at that point. The mixing board is fine, the Scarlett 2i2 is not recommended. At this point, I listen for pleasure to the Q701s driven by the Peachtree Decco, I listen to record/mix/check my master on the K701s driven by the Yamaha mixer.