Quote Originally Posted by psteve
This is what I use most often. They are excellent for all kinds of situations.
I love my 7506's :thumbsup::thumbsup::thumbsup:
I've had them for over 6 years and they're still going strong.
The most annoying thing about today's portable equipment is that you can't get a CD walkman with a dedicated line-out jack. I've got a Panasonic SL-320, from the 1990's, that has one, and it sounds great when plugged into a headphone amp, my Tivoli radio, or even a full stereo rig. I'm very careful with that Pannie - it' over 10 years old and I'm going to mourn the day it dies. It can play everything I've thrown at it, unlike my SlimX, which is fussy with CD's.

I don't know anything about iPods, but I think that most of them also use a cheap op-amp for their headphone jack.
Quote Originally Posted by psteve
Don't do it.
Koss headphones are one of the worst brands on the market.
Look at Sony Professional series, Sennheiser, Akg, or even Bose would be much better than Koss.
For the most part, I agree with you about Koss.

I have the Koss ESP/950 Electrostatics, and they're fantastic - and sound even better when powered by batteries in the source equipment and the supplied amp. The only drawback is the amplifier, which is built kind of cheap. But, the product is guaranteed for life. I've never needed to send the phones, or the amp, back to Koss for repair or replacement.