I just purchased and received the TH-909. This is not intended as a critical or extensive review. I think of it as a preview of an item you might want to consider listening to. No incentives were received for my purchase or for writing this opinion. Early impressions: · I plugged the...

How big an upgrade in terms of sound quality can I expect from Sony MDR-Z7 to the MDR-Z1R? I also have the Z7 and am thinking about upgrading to a Z1R (I will be running both out of a 4.4 balanced Sony amp - TA-ZH1ES). Alternatively, I can get the Fostex TH900 Mk 2 (or even save up for a pair of...