"William Sommerwerck" wrote in message
...
Have you tried simply using a pair of 8-ohm speakers
with the amp? Chances are they'd work (less power,
but shouldn't harm the amp).

I have, but then the audio output is too quiet for my requirements.

I'm not being sarcastic -- but how do you know that paralleling the outputs
will produce a significant increase in power? Ignoring the very pertinent
question of how to do this /correctly/, the most you could get is a 3dB
increase, which is plainly audible, but hardly a large increase.

A small increase is better than nothing.