Stringreen, I have not considered the HD 820, however have looked into the HD 800. I do agree that the wide disparity between headphone input/amplifier output impedance and headphone sensitivity/amplifier gain in addition to ones own subjective bias towards what is 'best' certainly begs one to exercise due diligence in matching both components. Given this, I think I need to purchase an amplifier that has a reasonable amount of gain and <3 ohm impedance.
Raymona, what headphone amplifier have you used with these headphones? Do you happen to recall the sensitivity and impedance for the 400? II have looked into the 400s as a possible entry into the realm of planers at very reasonable price. I need to find how the 400 and 400s differ.
Raymona, what headphone amplifier have you used with these headphones? Do you happen to recall the sensitivity and impedance for the 400? II have looked into the 400s as a possible entry into the realm of planers at very reasonable price. I need to find how the 400 and 400s differ.