Tripokaridos
500+ Head-Fier
Both are stock units in that I’ve done nothing to mod them. I got the 660s from the Sennheiser.ca store so I would hope they are authentic. The HD 650 was through Amazon.ca with Amazon warehouse as the seller. I don’t put a whole lot of stock in rtings.com ratings but the tempature chart they have when you compare the 660s vs 650 is probably what I’m noticing, there is this immediate cooling I feel within two minutes of putting the 650 on. Similar to what my old Game Ones feel like. At least with the 660 I can feel the clamp loosening already and running them on low gain seems to not make me feel so nauseous ( probably from repeated concussions I’ve had that I am sensitive to it I guess)
Can u post some photos of your 660 and 650 up close on headband and up close on pads ? Also can u take off easily the pads and take photo the driver production date ? If u got new they will have recent product date .