@pdq: Thanks for your attention buddy!Is there any kind of hardware I can put in my project that can allow me to fix a max output wattage? I mean, my maximum amplification will be 500w, but since I'm using it with a 150w speaker, I set this with some value 'piece of hardware' and it will amplify only 150w (like a volume control)? Thanks!
You'll blow your ear drums before the speaker.
Just keep the volume reasonable and you will be fine.
Sorry for bad english and dumb question, but I really want to know that because I'm sketching an amplifier......Well, when I finish my sketch and start to build it I'll be back here to tell you how is it going!