I believe that the 580 & 600 cables are terminated with a mini-plug [1/8"], while the 650 cable is terminated with the standard 1/4" plug.
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Really Sfar? They're all 1/4" where I live. :) Perhaps they can be ordered with either, that would explain things!
In any case, the three phones can all use the same cables since they have the same connectors. The 600s sound slightly better with the 650 stock cable, so that could be a worthwhile upgrade. However I still recommend getting something better, there's plenty of good ones out there. :)
Yes, Osgorth, really. I have two headphone amps, one with a 1/4 jack and the other with a 1/8 and I use the 600's with both.
According to the Sennheiser USA site, the 600 comes with a 1/8 plug and an adapter to 1/4, as did the now discontinued 580. The current 500 series all come with a 1/4 plug and an adapter to 1/8, as does the 650.
I have no idea why they use 1/8 plugs on some and 1/4's on the other but, as you said, it's not really material to this question as long as you have the right adapter.
Right, thanks for clearing it up. Weird, my 600s came with a 1/4" stock cable, no adapter included either!
But you're right of course, it doesn't really matter since it's so easy to go from one to the other. :) I guess they've made it so due to all iPods and such, that only has the 1/8" connector.
In any case, the 650 cable works fine in all three phones, and is considered the better cable.