Thanks, I'll look into it, see if I can get my hands on them.

Thanks I'm considering buying these however I would prefer the Reference II or Gold so I'm still deciding. I agree, I'm still planning on keeping my HD650 however those are my only main high end headphones and I want some variety.

Yeah I've been reading about the HD540 as well and is definitely something I need to get my hands on if I can find it.

I agree too but maybe I should have clarified it a bit more. I was wondering if there are any headphones from the 90's and earlier that can match/stand up against a modern headphones in the range of the HD650 as an example or if I'm wasting my time and should stick to modern headphones. I was...

I'm looking for an upgrade or matching sound quality to the Sennheiser HD 650 and was wondering if there are vintage headphones that can hold up against or be better than the 650s. For modern headphones I've been looking at the AH-D7000 modded, HD 800, etc..