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Well I know for definite one of my rear speakers (can't remember which one) is plugged in the wrong way round. But I'm no audio connoisseur so I don't think I'd notice things like bass frequencies disappearing!
But I guess if it sounds alright to me then I won't worry about it. To be honest I don't even know if the rear speakers are plugged in the right way round - the rear left might be plugged into the rear right socket (on the amp) and vice versa!