QUOTE(Andy Westcott @ Nov 2 2008, 12:51 PM)

Just to be pedantic (but also an important point) it makes no difference how 'big' the speakers are:
A portable CD player could be fed into a massive 50,000 watt concert speaker bank, and as long as the impedance was correct it would work just fine and be at no risk.
Agreed, but if one tried to use the portable CD player to get any sort of volume out of the speakers, the CD player would have to be turned up to max and that, in turn, would probably start it clipping and cause a lot of distortion.
It's better to have a big amp ticking over than a small amp run to the max.