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November 15, Updated the introduction. In every single circumstance and with every file-type and size we feed it, the M23 sounds assertive, muscular, lavishly detailed and vaultingly dynamic � but also refined, nuanced and subtle. Simply put, your money's going on the way it sounds. Hi-res file support: we test dozens of hi-res portable music players every year at TechRadar, and that means we know exactly which features, specs, file support and wireless audio codecs to look for.