Exactly, 'lumped together' is a good description, everything was sort of in the middle, then it started to open up.
Now they sound great, after about 6 weeks of use!
Someone posted that they are called 650 because that's how many hours they take to burn in, honestly, that is fairly accurate!
Really surprising that it doesn't mention this in the manual, something like, Congratulations on purchasing the Sennheiser HD650 reference headphone, you'll notice that they sound **** but please use them for 650 hours before returning them for a refund!
I wonder how many people have sold them on or refunded/exchanged them before hearing them properly burnt in?