What's up fellow drummers. I recently bought a Pearl Vision Bop kit, I like it but I'm still getting used to it. All my life I've been had heads with a port hole for mics and easy access to the pillow when I use them. I have never seen a bass drum 18'' with a port hole, why? Its nice to reduce bleeding for studio and gigging but I'm assuming there is so much punch its not needed to get inside to pick up more of the beater side. I haven't played out with these drums or recorded with them yet, just wondering why I don't see any port holes in small kick drums.