I agree about the 600's over the 650's with a good headphone amp (tube possibly). Though a little less accurate and not quite as full range the mid-level Grado headphones are very enjoyable.
Ok, but despite the fact that I need a good amp, which is the better set of headphones?
I've been reading that the differences are night and day and the 650 are better by far. However I've also read that the 650's are too colorful, perhaps creating a loss of clarity.
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