First of all, what is "good enough" for you - and what do you consider high end floorstanding speakers?
Then, if you're the kind of person who hears the gold-plated power cord, probably not.
On the other hand, the amplifier stages are not the problem any more nowadays. So, IMO realistically, there would be enough of those where the power stage will satisfy any reasonable requirements. The pre-/mixing stage will be more of a problem with the overall dynamics, i.e. the avalable noise floor. If you're running your high end floorstanding speakers in a typical living room and can only turn up the mixer to -40 dB overall before you blow out your windows, you'll get plenty of noise. Nothing to do with the acoustic quality of the mixer - just a severe mismatch between that mixer and your speakers and listening room.