There are some advantages to using linear power supplies as opposed to Switch Mode Power Supplies, which by the way work differently from PWM.
Thanks a lot, again, for your kind correction for my naiv confusion of Switching Mode PS and PWM. Yes, I now understand that DP-NC400-4-EXP (Class-D digital power amp) has linear transformer PS (not a Switching Mode Pulse PS) in outer boxes providing power to four Hypex NC400 working in PWM mode;
http://www.dentec-at.com/product258_0.html
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