Floorstanders vs Bookshelf

Monitor Audio Gold and Platinum speakers use a ribbon type tweeter, I have the Gold 100 stand mounts and love them, no listening fatigue at all.

The room is only 13 feet wide.  We don't know where the system is located.

If it is at one end of the 43 feet dimension then the driven space is much less as viewed from the perspective of the listening seat.  This would be more so if the speakers were located on the 13 foot end wall.  While true 'bookshelf' speakers might be too small (think Goodmans Maxim, 10.5 inches high, a friend of mine had them in the 1960s, they sounded good with their backs tight against the wall), bigger stand mounted types could be fine.

I used to run proac tablette 10s with my TDAI3400

And a rel stentor III sub.

I'm now running Jern 14eh.

I got good milage with power conditioning and chaining a cisco2960 into an Etherregen in my set up. Apple tv can sound amazing , the 4k is more resolving than 4th gen IME.

I agree with @ghdprentice and the issue is electronics and value line speakers. 
 

The Integrated you are using may be heater suited for use with a higher quality speaker. Has nothing to do with FS or SM speakers it is the quality of the components that make up that speaker, crossovers, tweeter type and materials, cabinets and mid bass woofer…..

For dual use HT and 2.1 listening look at GoldenEar BRX, ML Motion Series or further up the ELAC or Monitor lines. Get them from a retailer that has 60 Day Returns. Find what works in your home and be happy. Better yet go back to Dali..

The bigger the box...the better the experience....Tekton speakers are very easy on the ears......I love the soundstage they throw and use a Schiit Loki to fine tune the sound for different recordings. Beautiful. My upgraded Pendragons were only $2500 delivered.