This variant utilizes a 4.4mm Pentaconn balanced output. It doubles the voltage swing to 8V RMS. For hard-to-drive planar magnetic headphones (Audeze, Hifiman), this is objectively the best Sone033 configuration.
Even the best units have quirks. Here is how to solve the top three Sone033 complaints: sone033 best
The "best" Sone033 is always the one with the latest firmware. Version 3.1.2 specifically addresses USB dropouts on Apple Silicon Macs. Without this, you do not have the best experience. This variant utilizes a 4