Buchardt S400

Such as?

My living room is larger than yours and they do sound large enough to fill it well, but I also run a subwoofer with them and cross them over at 80Hz. No idea about your amp. Keep in mind they are 4ohm speakers. I don't have any trouble pushing them as loud as needed with my Lyngdorf but it's rated at 400w at 4ohm with 40amps current. They do a lot of things well but aren't my personal favorite speaker. Just depends what sound you are looking for. They are relatively neutral but the treble is quite soft - too soft for me. I find the mid-bass to be too rich for my taste too. Again this is all personal preference. A lot (most) people would probably prefer these speakers but I like a fairly bright sound and am very sensitive to fat mid-bass.

Ah, so he pilfered a Dyna engineer ! That's a good business move.

I saw an interview where he said they're working on powered speakers with DSP and built in room correction. With that technology and a wireless hub they're certainly pursuing a lifestyle audio system. Perhaps more than an audiophile system ?

Hmm same as Dynaudios I have had.... but loud they do sound nice. 

Mad’s doesn’t but the engineer that works for him came from Dynaudio.

To the OP the 400's are a good sounding speaker but for the 30 days I had them I found out the same as Srajen did is that they sound best played loud.  Not a low level listening kind of speaker. 

Mads Buchardt's father had a musical instrument store and they also sold DIY speaker kits. He’s not an engineer just someone who had a good idea and pursued it with a friend to start Buchardt Audio. He has no affiliation with Dynaudio past or present.

You didn't list your budget, but if you can swing it financially I encourage you to consider the newly introduced active A500 bundle.

Buchardt has a Try At Home policy. Best way to find out if the S400s work for you is in your own system.

These were all the rage among the YouTube-reviewer community a couple years ago. I've noticed the hype has subsided considerably, probably because so many great alternatives have since emerged.