AVS Forum Special Member
Join Date: Jul 2003
Location: Silicon Valley, CA
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If you just want a speaker that won't break when you put the volume knob to max, perhaps try a 6 or 8 ohm speaker. That should put less load on the amp, perhaps preventing it from clipping. But it probably won't play as loud, perhaps by a significant amount. You could also mod the circuit a bit so that "max volume" is not as loud, protecting the speaker.
If your requirement is that you want it to be as loud as possible with the internal amp, find a speaker with the highest sensitivity you can find.
However, I think the other responders are probably right that you will not achieve satisfactory results without an external amplifier. We can continue if you clarify your requirements -- why are you putting the volume knob to max?