Richard, as Casey indicates, the Yamaha "presence" effect isn't in the same category as the Denon "height" channel. It's a result of content not in the original source material which gets added by DSP processing. The Denon uses the licensed Dolby DPLIIz or Audyssey DSX to extract content already present in the material and sends it to the height speakers.

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Enjoy the music, not the equipment.