I looked it up, 45 wpc for about $1600 is expensive. It's manufacturer is an unknown name in the US, and apparently is Chinese made. It's quality is therefore uncertain. Also, it's no longer available on Amazon, for unknown reasons.
Do you already own this amp? If so, you might be saddled with an under-powered item. Perhaps you can sell it while it's hard to find them new.
In general, I'd aim to spend more on two speakers and less on an amplifier to drive them. There is a much better return from spending more money on speakers than spending more on amplifiers. There can be large variations in sound quality among different speakers. In well-designed and well-performing amps, much less so.
If you haven't bought this amp, it's much better to first find the speakers you like. And then find an amp with enough power to drive them without going into clipping.
Your 780 sq ft room is not small. How long and wide is it? More important than overall room dimensions, is how far away you sit from the speakers.
Many good sounding speakers can be easily driven by solid state amps capable of about 100 wpc. Many of these are made by well-known and reliable brands, and are available at significantly less than $1600.