The pittance of research I've done suggested it was the other way around. Lower impedance was harder on the lower end amps. Like what I'm kinda looking for. It may be what killed the stereo's power supply......
The lower the impedance the higher the RMS output and Amperage an amplifier needs to be able to output.
Some speakers have impedance swings as low as 2 or even 0 ohm, these speakers need an amplifier with a strong high watt power supply and high microfarad capacitance.
People often think if an amp has 200W written on the back that is how much it outputs, in actual fact that figure is the max power draw (from a 240v socket) under heaviest load but actual speaker power output may be as low as 40W RMS into 8ohm
Speaker sensitivity is also a big factor that has to be considered, the higher a speaker's sensitivity in dB the easier it is to power so an 8ohm speaker with a 102dB sensitivity could be powered by as little as 4 or 8 watts.
Also THD (Total Harmonic Distortion) comes into play, the lower the THD the cleaner the sound signal.
30W RMS @ 0.10%THD is better than 1000W at 1% THD