STEREO POWER AMPLIFIER & LOUDSPEAKERS
March Audio is based in Albany, WA, where it designs and builds electronics and loudspeakers. These already include the Sound+Image award-winning P452 stereo power amplifier — now updated as the P422, including a number of recent updates. A new power supply achieves lower noise with better voltage regulation. March has also updated its input buffer amplifier section, now lower noise, and has gain selection on the rear panel (see above right, opposite page) to optimise for either RCA or XLR sources.
It was the amplifiers which first brought March Audio to our attention, because they were very fast out of the traps in their use of Eigentakt power modules from Danish company Purifi. These have since been adapted and adopted by NAD for its high-level Masters series, yet the Purifi modules are also available to other builders.
Alan March quickly realised their merits even over the highly-regarded Hypex modules used in other March Audio products. Purifi’s Eigentakt module was designer Bruno Putzeys’ first post-Hypex Class-D advance, made in collaboration with Purifi’s director Claus Neesgaard and particularly with Lars Risbo, another pioneer of switching audio amplifiers.
“Their 1ET400A modules have raised the bar both technically and subjectively,” says Alan March. “They have a
