I just got a pair of Sennheiser HD 598s – rated at 50 ohms, with a near-300 ohm spike around 100 Hz. I’m listening to them through two different receivers I have in my home: one is a Denon stereo receiver, the other is a Yamaha A/V 5.1 receiver. I am using the same model CD player with both...

Hey guys.  For my first setup approaching high-end, I've been considering the Senn HD600s (or possibly the 650s), in tandem with a decent amp, most likely the Schiit Valhalla, or possibly the Asgard.  However, since learning about the new RS 220s, I've been wondering if I should hold out and...