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I for one think the inclusion of Audio in projectors is strange and pointless. If I really want to accompany my presentation with truly substandard audio, my laptop has speakers. Almost any type of speaker system will basically outperform almost any projector. Projector Audio will not "come in handy" when the external audio fails in a fixed installation, since there will be no audio wiring in place and grabbing anything that makes noise and plugging it into the computer will be faster and yield better results. I can think of only one use that makes sense for speakers in projectors: Active noise cancelling to counter fan noise. So, please build in that or get rid of the speakers and accompanying electronics.