PVC is pretty easy to drill into, like butter

. I would think just placing the pipe in a vice (protecting the finish with rags) and using a hand drill would suffice. I would use a center punch to dimple the hole marks first.
Also, acetone will usually remove the markings on the piping (which pretty much what clear "pipe clearer" is). It will dull the finish of the pipe, so best to put on some gloves and wipe down the entire pieces, for uniformity.
I just posted a question on their forum about using these speakers in a hot tub room, so will see if I get any positive answers.
