That’s awesome, super pleased for you. I take it these are a cut above the 6XX?
Damm thats a nice price. Yeah how do they compare to HD6xx / HD650's. What equipment you running them with?
Running them off a Marantz HD-DAC1.
I have been through a lot of headphones and only one never left my side after I bought it and and it was the HD650. I have tried the AudioQuest Nighthawk Carbon, which were great but the low impedance did not play nice with my amp, Philips Fidelio X2 (twice), Grado SR225e, AKG K712, AKG K550 when I wanted some closed ones (they are the best for the price still) and some from Creative, Panasonic, Soundmagic etc etc.
Anyway, in my opinion, and I do not always like their reviews, Z Reviews hit the nail on the head with the 660s. In my opinion, they take the best of the HD600 & HD650 and make it better. The micro detail on the HD600 series Senns as you know is really good for the price. The 660s just take the mick. I have a few reference tracks and without doubt, there are details now that I had not heard, or at least are now more prominent that the HD650. Not in a bad way. Everything just sounds clearer and tonally they are just perfect. The imaging is nuts. Z called them mini Stax and whilst I have not heard the Stax, they are meant to be the best you can get and that is high praise.
Apparently they have the HD700 driver in them which has been retuned and they have worked wonders.