Is Rotozip a good tool for cutting holes?

[DC Dave]

If you don't have either, I would, without thinking twice about it, get the router along with the jasper circle jig. It is so much more versitile and precise that it makes a rotozip seem like a toy in comparision. Sure both will make holes, but the router will countersink the driver, and bevel the back of the cutout for better driver breathing. You can also put a radius along the edges of the cab and use a flush trim bit to make all the panels fit perfectly.

I've got both and don't use the rotozip for speaker building.