I don’t think anybody has gone beyond 100ASLT, unfortunately. Even vicariously, it would be nice to see 150s and upwards.
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I could afford these, but not the castle to do them justice.
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The only person I’ve ever heard mention them was Jason Kennedy from the Ear who was quite taken with them.
Might be a bit tricky getting a home demo,!!
I would like to hear the big ATC’s (with inbuilt amps, not the separate power amp) just to see how they compare with my (fading) memory of active DBL’s.
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Here is the response from ATC…
"It’s not a regular maintenance procedure and it’s very rare to find that the screws have loosened but if you do then you can tighten them to the following torque specs
Tweeter bolts: 1Nm or 0.74lb/ft
Bass driver: 1.5Nm or 1.1lb/ft
Mid driver: 1.5Nm or 1.1lb/ft
Amp Pack: No specified torque, just hand tight is plenty.
If you don’t have access to a torque wrench then just turn with a hand screwdriver until you feel slight resistance, then one more quarter turn. Too tight is worse than too loose.
Happy listening!
Cal Shackleford
Development Engineer
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That’s what I did. Having owned audio equipment all my life I had done this many times. Too tight is always bad! I was gentle 
I wonder what finish those scm150s are, its rather nice.
At first glance I thought they were Cherry but zoomed in and looking at another picture I’m not so sure, lighter looking so maybe the oak (pippy). I’ll ask the question through the comments.
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Yes I would guess puppy oak too, the grian looks like that but the colour looks off in the photo.
Puppy oak and a big woofer
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I’m not aware of any recommendations for the Tabs, so after experimentation, I’ve settled on the following values:
1.2 Nm on the woofer screws
1.3 Nm on the outer tweeter screws
1.2 Nm on the (small) inner tweeter screws
It pays to be extra cautious with the smaller screws, as it’s very easy to overdo it.
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It’s interesting to see how many people think the active 100 and 150 must be better than the 50. After all they have bigger bass units, lower frequency performance and cost a lot more, so must be.
The bass units for the 100 and 150 are a lot bigger and heavier so that must compromises their upper frequency performance and thence the blend between the mid and the bass.
Maybe that’s why ATC consider the 50s as the classic?
Just a thought,
Paul.
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My 50s shipping from factory next week, yesss
12 week wait almost over.
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I’m pretty sure ATC would deny the woofers in their larger models compromise the sound of the wonderful mid-dome and the tweeter. The crossover frequency is the same and, as ATC do not use cabinet vents to accentuate bass, the only way to extend bass is with a bigger driver. I believe their view is that sonically the difference is simply the extra bass extension. My experience of listening to active 50s, 100s and 150s certainly tends to bear that out.
Roger
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I confirm, having 50 actives, heard 100s and 150s. Never wanted to upgrade
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And my room is 70 m. And 50s are more than enough powerful
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The ATC SCM20PSLT landed today, I have to say on first play the tweeters are lovely. There will be some fine tuning on position but for now not too bad, very happy.
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HiFiman, they look very nice in the room.
Remind me, did your SL2’s fail? IIRC I read that on here.
Are these the replacements? What else was short listed/auditioned?
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In a Youtube report, ATC said that all 3-way speakers had the same mid-high frequencies filtered in the same way; only the bass was different for better response.
Very nice, Enjoy.
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