"crystal copper". you audiophiles can really eat up anything. Well, i'd steer clear of sennheiser mostly because of the proprietary cables. even the ones that use a single 3.5mm jack has a proprietary port that prohibits you from using regular 3.5mm cables... that company is just a joke.
gcb0I don't like the small 2.5 mm jack either, but I would hardly call Sennheiser a joke. I have headphones from every better manufacturer and Sennheiser does a pretty good job compared to all of them. I'm curious. Did you have a bad experience with them to make you feel this way?
DABTPAMy experience with sennheiser were 2 malfunctioned cords on the PC363D model despite extremely delicate and careful handling in less than 1 year, and speakers frtizzing out on 2 different GSP350 models hardly anythng audiophile cans but enough for me to be extremely cautious of Sennheiser as a company despite there "German Engineering". The ones I tested at my local store the speakers worked fine.
I'm not saying there a bad company at all in fact the PC363D's felt very nice before the cables went out, they obviously produce some great cans that a lot of people like them, and I do too -- they're the only ones that seem to fit my ears (after going through all fry's selection) and seem very comfortable stock.
I just wanted to add my personal experience and 2 cents with Sennheiser. I've never gotten one of there products from Massdrop yet but many people swear by them. :~)
gcb0Single crystal copper means that the copper is done in an Ohno Continuous Cast process...whether that matters or not for the signal is another matter, but it is a different type of copper, and it's what cable upgrade enthusiasts go for.