SCM40A: As Measurements of ATC speakers generally are quite rare I will add my measurements of SCM40A here. It was improvised measurement, in the living room, speaker on the floor, mic distance 1m, mic height between mid and tweeter. Gating 4ms but there were still some reflections remaining.
I listened first, before the measurements. I would describe the sound as quite ok. There was certain dullness in lower midrange, the lack of the fullness in the bass and lower midrange, it , midrange was little bit emphasized and forward, trebles quite fine.
Measurements confirmed the impression. Additionally, there was almost zero damping material in the bass cabinet, which is the cause for dull lower midrange.
Midrange in not linear, though very smooth and consistent off axis up to 3kHz.
I think with some patient work and tuning these could be made to sound much better.
SCM12: see the writeup from troubleshooting and small tuning
Great set of measurements, but you must gate the measurements with a much shorter time until you don’t see any movements in the waveform. Those measurements have wat too much disturbance from reflections.
It will be interesting to hear more of your thoughts on the strengths and the weaknesses when you have had more time with the speakers.
The measurements AVMENTOR did does also contain way too much reflection disturbance to call them “gated” measurements.
