Sadly, I suspect Torbach is no longer allowed to reply to this thread if I'm not misinterpreting the moderator comment above.You are comparing HUGE ATC’s at a much higher price point to the relatively small 8C’s.
The 8c’s are well capable of producing “dynamic” sound, from this review (https://www.erinsaudiocorner.com/loudspeakers/dutch_dutch_8c/):
Subjectively speaking, the maximum output SPL was approximately 100dB at the main listening position (4 meters away) for the pair of speakers playing full range (20Hz to 20kHz). Above this volume, I felt a bit apprehensive pushing the speaker further (I don’t own it and it isn’t cheap). 100dB full range at 4 meters is very loud.
And “build quality” of the 8C is superb. Yes, it does not have a HUGE cabinet, because it uses smarter ways to produce sound. The ATC looks (and is) a speaker from the 70s.
And your point of a treated room has nothing to do with the speakers.
I'm sure the 8C's are great speakers, Torbach just prefers another pair of speakers.
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