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One thing that is becoming very common is the use of 'spatializer' type processing which can image instruments out into the room, even behind you. With properly set up speakers, these can sound amazing

When Soundhound visited me, he heard some popular stereo soundtracks that had these effects and he preferred hearing them here in straight stereo over just two speakers, rather than having them processed into a 5.1 sound with DPL II or DTS NEO processing.