I've got a digital piano with a couple of powered near field monitors. The bass notes are weak and I'd like to add a powered subwoofer. I've got a sub and enclosure, but need a plate amp that has a ...

It could pop with a less powerful amp. I think a lot of people who have concerns about this sort of thing make use of voltage limiters. If you're using p.a. equipment, you may already have a limiter.

Taking apart a circuit board or module and reconstructing its complete schematic is a valuable skill. We can see how someone designed circuitry to gain ideas that can be applied to our work. And ...