Cap, or no cap?

[amsterdamn]

The problem with a cap is you don't know when you're clipping. It also puts undue stress on the electrical system that is already inadequate.

This is the kind of answer I was looking for. I searched around the web for a while and found many people who recommend a cap. I read only a few who were against caps altogether, but not one explained why. I just got tired of looking around (plus I have more important things to do) and figured I'd get a good answer here. Thanks.