The Remo DynamO Stick On Port Hole Template is a great way to easily outfit your bass drum with a porthole. Many drummers insist on this sound on stage and in the studio.
AMS Tech Talk...
Venting - As a general rule, we recommend cutting a hole in the front bass head only when necessary. Cutting a hole in a drumhead causes the drum to dry out and lose sustain. There are a few good reasons for doing it, however, such as mic placement for live or studio playing or having quick access to the muffling device. You may even want a drier sound. For these occasions, Remo offers DynamO’s hole-cutting templates.
Stick one of these where you want the hole (on the inside of your resonant head) then cut out the inside of the ring. You can use the counterhoop to raise the head off the ground while cutting. That’s pretty much it. You'll need a fairly steady hand, but it's not a big deal. One little tip though: Although they come in white or black to match most front bass heads, it looks cleaner if you stick them to the underside of the head.
If the idea of cutting a hole in your drumhead makes you nervous, Remo now offers bass drumheads with a pre-cut hole.