All the way GOLDMUND 28.4M or 29M.... you may try Spectral with them too. Although they are not the best Sound Factory speakers. (old stuff still better) Good luck.
I heard solid state on them and hated it. I was fatigued after a very short time. I would recommend tubes.
I have also heard the BAT vk-150se amps and vk-50se preamp with the Amati's and it was GORGEOUS sound. It is a bit more than you want to spend, however it is something to shoot for.
I would vote for the Blue Circle BC 3000 preamp and new AG 8000 hybrid monoblocks. Just the right amount of oomph for that 4 ohm impedance and enough soul to make those lovely creatures dance. Solid state with Sonus Faber is a no-no.
I gave these speakers a serious listen and decided to stay with my Dunlavy's but I would strongly recommend tubes. I heard them with both the big CJ monoblocks and Spectral monoblocks. In my opinion if you like their sound you should stay away from solid state amps.
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