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That's when they're connected to club limiters and bloaty sound systems with muddy bottom end cabs and screechy tops (horrid pa horns).
I've thought of replacing it with a Rane, Urei or something digital, but the DJM600 sounds pretty good, trust me.
The most over-rated club mixers IMO are Allen & Heath, which work so badly, but have a mythical reputation. Their PA mixers were all shit, so why people rate their DJ mixers is beyond me.
If you want to hear it (DJM600) through some hifi components, you're welcome to come round and have a listen, you won't be disappointed. Message me.
Bloated, muddy bottom end, hideous screechy tops and a truly painful midrange and that's when they're not in the red.