hope this isn't rehashed, couldn't find a similar topic.
i'm wondering if headphone amps are actually better at powering good headphones (something like Sennheiser HD 700) than a mid to upper range AV receiver would. i have a Denon 3313ci which costs a little over $1,000. however, a quality, dedicated headphone amp can cost $2k+. why is it better than plugging my headphones into an AVR? is the price jump justified? less noise? better reproduction? what are the advantages of headphone amps? i simply don't get it.