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Purchased the 6XX and have been using with the topping nx4dsd/samsung 7edge , alternate of HP omen to topping thru both dac(usb) and 3.5 output. I am hearing hissing in both channels of the phones as well as a lack of tightness in the sound. I am guessing the topping is not powerful enough to drive them?? Is the hissing due to lack of power or something else, like a bad set of cans?, I am a newbie on a budget so I am wondering if I made an error in purchasing this setup... any suggestions welcome. thanks for your time
I have a topping NX4 DSD and run my fostex T70-RP 250ohm, no hiss.
Try changing USB Cable, Headphone cable, maybe get the either the headphones or the topping RMA'd.
I have also S7 edge with a lot of headphones , even 600ohms and u have to know that the hissing noise has nothing to do with your phone . For me its just bad cans.