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SMPS (switch mode power supplies) are seriously efficient and very lightweight. My Eden WT400 will pull up to 800w from the wall with a 400W rated class A/B output; a Markbass F500 (500w class D SMPS) pulls about 550W max.
Also, the SMPS Class D amps clip a lot more smoothly than a lot of A/B designs. That's why the Markbass Little Mark II/III (both of which are lightweight A/B designs) aren't quite as nice sounding at high volumes as the F1/F500.
Also, the SMPS Class D amps clip a lot more smoothly than a lot of A/B designs. That's why the Markbass Little Mark II/III (both of which are lightweight A/B designs) aren't quite as nice sounding at high volumes as the F1/F500.