Any time you buy a Micro/Mini-Amp you are buying a compromise, but that is Audio Life, we are all trading something for something else.
Teac A-H500 - amplifier overview and full product specs on CNET.
www.cnet.com
One of the best sounding amps I ever owned, and one I had for decades was a 45w/ch Pioneer
(full sized). And I consistently drove large 12" speaker with that amp.
So, unless the rated Sensitivity of a give speaker is low, I don't see much problem using floorstanding with a 45w/ch amp.
But as I said when you buy a Compact Amp, you are buying compromises.
My impression is that the
Thread Starter has had the TEAC for quite a while and seems very satisfied with it. So, not sure we need to go there.
Now certainly a full-sized higher-powered amp would be better. But that is kind of a rabbit hole that a person can get lost in. There are always bigger more expensive higher powered amp to be considered.
The
Monitor Audio Bronze are rated at 90db Sensitivity, and that should be high enough to be driven by just about any Amp. Just a guess, but I would say any speaker 87db and above are going to be fine.
Now you are all free to have any opinion you want about the TEAC, that's fine. But for a vast majority of us, we play with the amp we have, not with the amp we want.
I think most of us are engaged in
Stepped Upgrades. That is, we upgrade one item at a time, step by step, rather than entire systems. Right now Floorstanding is the step that the OP wants to upgrade. Later when the urge strikes he will probably upgrade the amp. But for now ... one Step at a time.
Steve/bluewizard