Aesthetix Mimas is not a Class D amplifier. See the below quote from their web site:
Big Power, Stable Power
For power amplification, we again looked to our existing industry standard products and borrowed a derivative of the output section from our Atlas amplifier. This power output section is fully discrete (no integrated circuits), fully differential, zero-feedback, DC coupled, balanced bridge output operating in Class AB. It is capable of 150W into 8 ohms, and nearly double into 4ohms, with both channels driven. Aesthetix painstakingly matches individual FET input devices and bipolar output devices, to ensure channel matching, linearity and stability driving any speaker load.
Big Power, Stable Power
For power amplification, we again looked to our existing industry standard products and borrowed a derivative of the output section from our Atlas amplifier. This power output section is fully discrete (no integrated circuits), fully differential, zero-feedback, DC coupled, balanced bridge output operating in Class AB. It is capable of 150W into 8 ohms, and nearly double into 4ohms, with both channels driven. Aesthetix painstakingly matches individual FET input devices and bipolar output devices, to ensure channel matching, linearity and stability driving any speaker load.