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Most compact 4-channel amps cut something to hit their small footprint — usually flexibility. The Skar Audio SK-M4004D is part of Skar’s dedicated “mini” amplifier series, and it doesn’t make that trade the way you’d expect: it keeps independent crossover control per channel pair, a feature that lets you run front speakers full-range while bridging the rear pair for a sub, all from one amp. This Skar SK-M4004D review covers what that control actually enables, real verified dimensions, and honest power output at both 2Ω and 4Ω.
