Thanks for the reply. There actually isn't any headphone jack on the CD player, only the amp. Kind of surprised. Since the phones I'm looking at are both high impedance, then they should be OK with the amp. Great news for me!

I have the subject integrated amp and NAD C542 player. Looking at getting either the Beyer DT990 Pro or AKG K601. There seems to be an inconsistency on what amps can drive what phones. Does anyone know if I'm OK with either of those phones, or I need a dedicated amp? Part 2...... If I need...

Figured I'd try this from a different angle Instead of ordering different sets of phones, trying them out, and sending them back, I figured I'd look for something suitable for me through a different line of questioning I like the sound of Klipsch. I have the RF-82s, but also love vintage...

Finally found a Beyer dealer in Canada, Long & McQuade. The only higher end ones they stocked were the DT990 Pro and DT770 Pro. So, looking for an open phone, I tried the DT990 Pro. First listening, really nice detail, a little harsh on the high end, but not Grado like, but at moderate levels...