Revel F228be- will my amp be enough?

Hmm ok. I have heard the 1037be and 1028be a good bit.

What did you like better about the 1028be over the Kanta?  
 

I am of the opinion that the 1028be is an overachieving speaker and will be hard to upgrade without spending a bunch of money. It’s short comings are lack of bass and a bit of extra treble energy. Once you add in subs you are splitting hairs between it and the Sopra. I would imagine the Sopra has more bass impact but subs trump the speakers ever time. 
 

-the 228be will most likely have softer highs than the 1028be. The mids might be a wash with slightly different tone. The bass on the 228be is a bit light for it size and could use some front all gain. What you will gain is the ability to play silly loud with more dynamics on the 228be. Whether that is an advantage to you or not… probably not. 
 

-what I would say is the standout feature of the 228be is a very natural midrange with exceptional center focus and a wide stable soundstage. The vocals just float in mid between the speakers with the 228be. They do no wrong but there are more flashy fun speakers to listen too. I would take big focal or Wilson’s over my revels if cost were not an issue. If you move from focal to revel you might miss the liveliness of the Focal. But if you find the focal bright you might enjoy the slightly softer Revel. 

I have the same amp as you (Marantz PM11s3) driving a pair of Raven Audio Celest' Towers (90 db 4 ohms). I'm in a 20X14 room with 7' foot ceilings and the amp has no trouble driving the Ravens. I like to let it rip once in a while and the Marantz has no trouble. As you stated the amp doubles down into 4 ohms and in less you are a total headbanger (which you are not) or in a very large room (which you are not in) in my opinion you should be fine.

   As a side note the PM11s3 is a very underrated amp. I've had mine for over 6 years and for people that know me that is a world record. The PM11s3 was KI's final top of the line Reference Series AB amp, every thing after that was class D (which I've never heard, but heard very nice things about). The phono stage is outstanding. I use an Ortofon Quintet Black LOMC with excellent results. In my opinion you would have to spend a whole lot more money to get a better sounding SS integrated (and it may just be different, not necessarily better) especially one with as good phono stage. Your Pm11s3 is definitely a keeper. 

A local dealer carried revel for many years and he told me revel speakers can't get enough power. I bought an anthem 225i off of him after listening to it drive a pair of revel f208's. If the Marantz isn't enough pm me and i'll sell you the 225i for a great price. It's been sitting unused since I bought my H360 3-4 years ago.