The AKG is reported to be a pretty high quality pair of cans. The Rotel headphone jack is unlikely to be up to the task of showing you what they can do. Give a headphone amp a try, inserted into the tape loop of the pre. For detailed discussion of various hp amps, try head-fi.org.
Explain 'matching ohms to me?
I am buying a pair of AKG 701 headphones,and am playing them thru my Rotel preamp. Somewhere I was told I had to match the ohms. I am totally illiterate in this ball park. I looked up the specs on the Rotel. Their useable headphome impedence is 8 - 2000 ohms. The headset is aroud 63 ohms. Can I run the head set thru the Rotel? Help me understand all of this? Thanks. Jack