There has been a lot of comments about the power rating of AVI's ADM, including some searching questions from yours truly on the HDD forum a few years back. Nothing clear has ever emerged to my knowledge but you get a relatively beefy amplifier 'on a plate' for each of the speakers, that means a good sized torroid and power capacitance. It all looks rather impressive and neat.
There is also no power sapping passive crossover in the path so these are active watts. The speakers go very loud but you can overdrive them even in a normal sized UK room if you get silly at parties as I was told reliably by the friendly guy who started the AVI website, the same one who brought his ADM's to my house twice and which I visited subsequently to do a comparison between the above and a pair of active Dynaudios.
Its a long time since I listened to them but I remember that they need a subwoofer (which was switched in both at my place and Darren's, the chap in question). Without they sounded to hifi and dare I say ... to clean and antiseptic.
With a subwoofer they sound fantastic and I doubt there are many 'conventional' (passive) systems that equal it (at the price, especially second hand) although a Cambridge Audio 840A and matching 840C cd player did, if I remember correctly, come fairly close both in power and sound with MS and Kef speakers. - You gain functionality but loose the neatness (and looks).
All the above was with the original ADM's. They have since been superseded a couple or three times so will likely have improved. Customer service also seems to be second to none, the company co-owner always being at hand to help.
I am a cyrus user and really like the look and build quality. You could build a system around one of their streamer amps (if it has to be built in), if you find one second hand and add a good standmount, such as Ushers S520 or Monitor Audio RX1 for a more traditional system. You'd still need a phono stage though. Or you could go separates such as an 8vs, DAC and speakers. This will also give you a good headphone amplifier and the possibility of adding a PSX-R at a later stage.
Good luck.