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There is no ATC SCM150ASL Pro review or frequency response curve.

Have to say that I agree here. Not sure why ATC choose not to show measurements. Seems odd.
 
Because they are under no legal obligation to do so, and their unit sales are obviously enough for the owners of the company.
 
The term "proper" discussion is not my statement it is was posted by Keith of Purité Audio.

Ah, sorry. I read your post too fast and got the idea that you shared his idea that proper discussion can’t be had about ATC speakers. :)
 
Eh, yes and no. KH420s are huge, much larger than the 25As or 310s - the size comparison is more the SCM50s, which are quite a bit larger. I can understand wanting something a bit more if you're space limited.

As for the first bit, their LFX is actually quite similar - Per S&R, F6 is 32hz on the 25A vs 30 on the 310. Neither of them will get loud doing that, that's asking too much of small drivers in small boxes. With the ATCs, if you bring that 5dB hump centered around 60hz down, suddenly you've got a bit more headroom all while having a flatter LF response (and yes, they are a bit chesty and thumpy around there).

Large ATC will also benefit from adding a subwoofer. I recently added 18" unit to augment a pair of SCM100. I like what I hear now (flat to 15Hz at 95dB). Distortion of 2.5% at 20Hz does not hurt. If someone uses smaller speakers, subwoofers is a must, thus there is no real need to try make speakers working down below where they really cannot produce undistorted sound.
 
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Large ATC will also benefit from adding a subwoofer. I recently added 18" unit to augment a pair of SCM100. I like what I hear now (flat to 15Hz at 95dB. Distortion of 2.5% at 20Hz does not hurt. If someone uses smaller speakers, subwoofers is a must, thus there is no real need to try make speakers working down below where they really cannot produce undistorted sound.
How was it before? I agree ATCs are generally rather bass-light for their size.

5dB hump? I’m guessing you’re looking at the measurement posted by Purite Audio above? The port ‘hump’ on the SCM25 is actually more like 1-1.5 dB in reality.
I've just reached out to ATC about this, so we'll see if they comment.
 
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How was it before? I agree ATCs are generally rather bass-light for their size.
It was good in bass, but unevenness required digital room correction. Use of a sub added very low bass (below 30Hz) and also made overall response smoother without digital assistance. Selection of sub location, crossover frequency and phase adjustment allowed make overall sound more even at least in main listening position.
 
How was it before? I agree ATCs are generally rather bass-light for their size.


I've just reached out to ATC about this, so we'll see if they comment.
I agree, they are bass light for their size; an easy fix with subs or eq depending on the room.
 
Sorry Keith, "a proper discussion on ATC", what would be the point? I think that very few the people on this forum own ATC speakers and the rest don't intend on buying ATC speakers.
Most of the comments are negative, (old, out of date, no credible measurements.)
To me it is being unfair to the makers.
It is their prerogative to publish what they like. No disrespect of course, Theta
They can publish what they like, and we can have the opinions we like. Neither of these things is “unfair” to the other.

If the measurements were really good, I think they would happily publish them.
 
All I'd want from the design is the SM75150S... Pair it with a Bliesma tweeter and a nice 15"/18" woofer.
 
The newer ATC tweeters are very good, just don't have a proper waveguide (similar to e.g. the stock Bliesmas). Their woofers could be better IMO. The SM75-150S is still one of the best midrange driver.
 
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