It's Cyber Monday. Looking to pick up either ATH M50X or Beyer DT770 Pro 80 ohms for silent practicing. I own a pair of DT880's (250ohms) for mixing but the semi-open don't get super loud and I can hear all the fret clank and outside noise, so I prefer closed. Mostly I just want to make sure they have great bass. Anybody have any experience with either?