Interesting GaN Monoblock amps with 150W capability with an external 48V/5A smps. You can also get a GaN 48V/5A SMPS for $40 from another seller on Amazon.
It is based on the ACME ACM8816 GaN single amplifier IC that takes up to 96KHz I2S Bus or 192KHz TDM digital data input data directly to a PWM Class D output stage. The idea of the PowerDAC from a few years ago on an IC.
Very interesting.