Bill....
That is not to say something like a panny will be unlistenable - it is just that better amps will be - well better.
Right....and the better the amp....and the more power you have....the better it will sound. 
In biamp mode the panny gives 200w to the woofer (I am not sure if they are bridged - in which case it would be 400W) and 100W to the tweeter. Are you seriously suggesting that is not enough power? I know SP speakers can be wound up to phenomenal levels with no distrees - and the tendency is to use it - but if an amp is better than a panny I would suggest it is better not because of available power. After all 100W sounds only half as loud as a 1k monster.
But the issue of power required for SP speakers has been rehashed many times - and on this I differ with you and a number of people. It would be a boring world if everyone always agreed

.
Let the final words be Bob's:
http://www.audiocircle.com/index.php?topic=47846.10'The Minis are an easier load than their big brothers - the Timepiece 3.0s. They are 87dB @ 1W1/M as opposed to 85dB for the 3.0s. Reason being is that SEAS used basically the same motor structure for the Mini woofer as used in the 8-inch TP3 driver. Since the cone is smaller it has less mass and is therefore easier for the amp to push. This also raises the smaller woofer's free-air resonance, but that's OK as I don't think we'd want to push a 6.5-inch cone all the way down to -3dB @ 30 Hz. 2dB doesn't sound like a lot, but it reduces amplifier requirements to near half of what the 3.0s needs. So... the Minis are pretty easy to drive. I'll tell you what, my NuForce Ref 9s will blast you on your ass if you wanna play it that loud. I know I do'
The ref 9s are rated at 160W into 8 ohms. I suepct 200W a panny is - how do Roles dealers say it - adequate madam.
As always Chris - all the best

Thanks
Bill