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Hi guys, im looking to pick up a dac. I'm currently using the e10 as a dac and the o2 as my amp.

 

I'm debating picking up either the ms2 or the 404 as a dac before going to the o2.

 

I plan to only use usb input. Headphones I plan to use with it: Ultrasone Pro 900, Senn HD650.

 

I dont have much experience with DACs. The only thing I can compare to is the e10 and my friend has an apogee symphony in his studio. Wonder if anyone has opinions.