Speaker and amp advice needed

If you are running a HT you usually have room correction, so you shouldn’t have to worry about the speakers being too big, in terms of having too much bass.

With a simple room like that, check out AM Acoustics room mode simulator. Put in your room dimensions and it will help you not only visualize the room modes, but also help you keep your speakers and listening room away from the lowest modes.

My suspicion is you’ll have a few very strong modes in the lower 2 octaves and bass traps like GIK Soffit traps will really help cut and smooth that out.

The height of the room is rather small, so consider abosrbers in the ceiling between listener and speaker and/or below the beam you mention.

Acoustic treatments and room measurements should be done before you spend money on gear.

If you need help GIK Acoustics will remotely help with the room treatments. They did some great work on my small office.

Another option is this one. I know DSP is not always well received here but this guy can remotely make your room sound great. It helps if you are doing streaming from something like ROON or JRiver so that you can plug in the Convolution filter he would create for your specific setup.

Digital Room Calibration Services, Convolvers, Headphone Filtersets (accuratesound.ca)

Anthem also has a DSP based on their hardware. My suggestion for DSP is software based and not limited by the processing power of any audio hardware.

@OP - that is quite a large room and definitely there is no problem using a pair of Amati's in it. I spent two days with a pair recently in a similarly sized room and they sounded absolutely fabulous. Obviously, you would benefit from a better amp as you suggest.

Sonus Faber makes a great speaker. The chief designer was Franco Serblin. He exited and started his own company. His Ketema loudspeaker is one of the best dynamic speakers I have ever heard. 

You can put any speaker you want in that room. The only limitation is the ceiling height. If you want more realistic sound and an amazing theater experience you should go with a line source loudspeaker and add a second subwoofer and a two way crossover. Examples would be, the Magnepan 20.7 and the Sound Labs 645-8s or 845s.  If you check out my virtual system page you can see the Sound Labs 645-8s in a theater set up with four subwoofers.

Line Source speakers produce a larger more lifelike image and put you in the front of the venue. The are project power better which is why they are used at large concert venues.

I've auditioned the Amati's (previous generation) and the Olympicas.  Go for the Amati's, you won't regret it.  They do like power and the MA352 may or may not get the job done.  Heard the Amati's driven by the more powerful MA12000 and it was right on the cusp of clipping which was very surprising.  

The Focal Utopia's are fantastic, revealing speakers but the Focal house sound is the exact opposite of Sonus Faber IMO.  Good luck and cheers.