if you have good enough components, the legacy LA830 is a brilliant amp, full protection, etc and clipping to stop distortion doin as much damage to the speakers, etc
Got it for £109 or something, worth a lot more, was £300+ if i remember right !
Got it powering a set of sony 6x9s and a 400watt RMS sub, and doesnt even break a sweat, its at unbearable loudness and its only bout 40% of the way up, runs at 2 ohm stable stereo as well, full HPF/LPF Bass/Treble Boost, etc and has a daisy chain on it for connecting another amp to it...