Sigh, I gotta miss this. Sigh, I'm sad to admit I know this, but both vents are still in place. I don't think they actually use the vents (I believe they're heaters) very often. I've placed my H4 right up on them with no issue. Having tried both, I'd definitely stick with the rear vent, farther from the stage. (Brad I need that bloomers first song! please!!)