When you consider the ADAs gain is 29db, the 8805 needs to get the noise floor pretty low not to hear it from 6 inches. Like I said … not an issue. The noise which does bother me is the ADA’s transformer electro-mechanical hum (especially after they warm up for a while). Didn’t really hear it till the walls were in … But when there is silence … I may be building building some hush boxes in the near future (for the ADAs and the projector).