The Rega Solis is a power amplifier with discrete balanced circuitry. It delivers 168 W RMS per channel into 8 Ω and 305 W RMS into 4 Ω, through a balanced or unbalanced input.
The MA 30.3 mk2 is a class A / AB mono power block assembled by hand in Germany. It delivers 300 watts under 4 ohms from a MOS-FET output stage and a 550-range toroidal transformer.