Bill I have used the BA330 with and without a mixer..by itself..no other speakers...This was the way I intended to use it when I purchased it..

I have experimented using the BA330 and another speaker..a Podium 802 ( I currently only own a single 802)..and also used the BA330 with a pair of the Roland cubes..it worked great with both..The secondary speakers are controlled by the channel volumes of the BA330, and not effected by the master volume control of the BA330...the master controls only the level of the BA330..

This makes it very easy to use the mixer section of the BA330 with external speakers (powered)..

I find the amp fullness in sound and plenty of volume to cover 100 people venues..When I use the Edirol mixer..I have increased gain, and the BA330 handles it well...maybe capable to handle 200 people venues...

If you need to discuss anything you can email me...