I only have 3: Truthear Zero Red, Etymotics ER4S, and Hifiman RE-400B. The Hifiman lags far behind and is matched with the HM-700 DAP. I love the Zero Reds, great bang for the buck, no need for EQ and huge bass, especially with the 10 ohm adapter. The Ety is ancient, I needed to replace the...