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· Super Moderator
59,109 Posts
My first assumption would be, since this is a DLP, that the colour wheel may be creating the hum either from a slight imbalance, or perhaps worn bearings, etc. There are moving parts in DLPs.

A clearer description and the location of the hum would be appreciated.

Then, check out the following post, useful for those new to the forum - FAQs, Search Tips, Optimization, etc:
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