@soix ’s comment is on point
that been said, i would add that in my experience atc’s are very demanding of amps in terms of power as well as tonality - atc’s are ruthlessly revealing and hard to drive (quite inefficient)... their lower tier speakers present an irony in that the speakers may be $1500-2000 a pair but to make them sound really good you need double, triple that in quality of amp to handle
think ultra high grade high power solid state (which can be mucho $$$)
that been said, i would add that in my experience atc’s are very demanding of amps in terms of power as well as tonality - atc’s are ruthlessly revealing and hard to drive (quite inefficient)... their lower tier speakers present an irony in that the speakers may be $1500-2000 a pair but to make them sound really good you need double, triple that in quality of amp to handle
think ultra high grade high power solid state (which can be mucho $$$)