I have the brownie. These are so close to being outstanding if it weren't for the comfort issue. I was able to wear them for about two hours of a 14-hour flight before I just couldn't take the pain any longer. My outer ears literally hurt for the rest of the flight.   If they would have...

Quote:   I think what you may have meant was...an amp gain setting meant for higher impedance headphones = higher power output. For example, as you increase the value of a resistor (in ohms) in a circuit, the current (amps) and power (watts) will decrease.    We're not concerned...

Well, let's take a look at the HD600 product data to first find the impedance. http://en-us.sennheiser.com/downloads/92eb813de08987eaedf66b9777bd6bdc.pdf     Technical Data Frequency response 12 – 39,000 Hz (–10 dB/1 kHz) Transducer principle dynamic, open Frequency...