@Litlgi74 Suggest trying to lower the output of the DAC into the amp. It's easy to overload the amp input stage (not related to output power) if you're running the DAC full out, all depends on the DAC, and amp. Also note the electronics you're running are ok, but with the 1266 this system will get a bit hard sounding when you push it, have a multiplicative effect with that amp/ DAC combo as the volume/gain increases. In other words, you could use smoother sounding gear, or tubes. On fit, that's a big gap you have. My guess is you've chosen this fit to add more of a bass bump to compensate for the system hardness. At that distance from the ear pads it also means you will turn the volume up higher, a bit of a viscous circle. On the WA-33, it's one of our favorite headphone amps, so much so we worked with Woo to develop a JPS Labs Edition wired with JPS Labs conductors internally and with KR Audio 2A3HP and 274BHP tubes (which we worked with KR to develop for headphone amps). We have this amp in black, driven with the XIAUDIO SagraDAC, maxed out with JPS Labs Aluminata cables. Sounds fantastic, plenty of bass slam when called for, and the reserve power to back it.