I have been lurking around these forums for a bit and doing so has resparked an interest in headphone listening. Thanks to all for the information.
My reason for posting is this... I have a set of Stax SR Lamba headphones with the SRD-6SB adapter and extension cable in mint condition. I've had these for a long time (original owner) and have used them off and on for quite some time. I use them via a NAD 7600 receiver's headphone jack. I like the setup because of the NAD's bass and treble controls which are of the 'semi-parametric.' This allows eq'ing of the sound pretty easily. The only change I've made is replacing the rear foam for a felt pad. The foam was in bad shape a number of years ago and removing it and replacing it was straightforward and easy. Everything else is stock and mint.
Recenlty I picked up the Ultrasone HiFi 2400 and HiFi 680. I love open backed earphones and the S-Logic technology is really nice. I like the balance of the 680s (a little forward) but the 2400s have such a nice sound; just a little laid back in the midrange.
I would like to get an idea what the Stax might be worth these days since I would also like to try the Ultrasone PRO 2900 and eventually a few others. Any information/direction would be greatly appreciated. Sorry for the long post.