Unless your cd player has a headphone jack, you would probably have to run a set of interconnects from the tape out jacks on your preamp to a headphone amp. I am not a big Sennheiser fan (I use Grado RS-2's and Ultrasone HFI-600) but I have heard the Sennheisers sound good with the Earmax tube amp by Audio Advancements. To learn more about amps suggest you check out the forums at headwize.com and head-fi.org. Also headphone.com has a lot of useful info.
Headphones-How to Connect?
Thanks to all for the information you have provided me. I have an ARC V-70 amp, ARC LS-15 preamp, Naim 3.5 CD player. Can't listen to it because the children are doing their homework. Looking at the Sennheiser 600 headphones. Do I need a separate headphone amp? If so: which one? If not : how do I conect the headphones to my equipment?
Thanks to all.
Thanks to all.