Having worked retail for 20 years (electronics stores, bike shops, book shops, groceries), I can tell you there are 4 types of retail assistant:
- enthused and empathetic and genuinely trying to help you
- just getting by, trying to earn a living, largely indifferent
- jaded grizzled types whose filter has been completely eroded, if it was ever there (usually the final state of type 2)
- testosterone-fuelled borderline sociopaths who would rip your head off and slam dunk it in the till for a sale, and whose attitude to you will turn in a dime based on whether or not you are going to buy something ‘worth their time’.
Retail, sadly, tends to reward the fourth type only.
It could be that you’re like me, and like a bit of bass. The HD600 doesn’t have much at all (fight me Senn fans) so you keep turning it up to get some impact until the upper midrange starts to hurt you.
Try a little bass shelf and see if your experience doesn’t improve.
(it won’t solve the soundstage issue with those headphones, however)