I know you don't have a way to measure, but I'd be curious to see some. I know this ain't your first rodeo so you're an experienced listener, but I wonder if there might be a slight tilt in the treble making it sound crisper and clearer?
The 4" drivers make me hesitant too, as far as blending with a sub for music. 5.1 movie watching and such wouldn't be too bad I'd imagine tho. You like them for music too?