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ATC 100A Upgrades Studio Monitors
Old 21st November 2017
  #31
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Quote:
Originally Posted by midmost View Post
he certainly did!
as the only one ...

No. Not the only one.
Quote:
Originally Posted by pentagon View Post
The SL woofer has less harmonic distortion. The change is very audible. I have heard old and new 50A vs 50ASL. I have also heard the non-SL version driver used in other speaker maker's speakers (ATC sells the non-SL drivers to other makers). Search for "super linear" "ATC" and you'll find out what the design change is.
Old 21st November 2017
  #32
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midmost's Avatar
oh, sorry, I have seem to overread that

so from what you guys report I fear there is quite a big sonic difference from an ATC bass driver to an ATC SL basss driver
thanks for the insight
Old 21st November 2017
  #33
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Quote:
Originally Posted by pentagon View Post

No. Not the only one.
oops, my bad too pentagon. I noticed that and then was distracted.
Old 27th November 2017
  #34
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Progress?

Quote:
Originally Posted by breadvan View Post
Thanks again. Will certainly contact her and see what options I have. Much appreciated.
Have you made any progress? I am curious to see what you decide to do. Thanks.
Old 3rd March 2018
  #35
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midmost's Avatar
Hi guys,

In hope to get more insight here: does anyone know the technical differences between a SL woofer and a non-SL one?
Is it about the membrane? The motor? The coating?
What makes its THD values drop by minus 15-34dB compared to a non-SL woofer?

PS: someone told me that the differences are not very obvious until you go loud
Old 3rd March 2018
  #36
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Quote:
Originally Posted by midmost View Post
Hi guys,

In hope to get more insight here: does anyone know the technical differences between a SL woofer and a non-SL one?
Is it about the membrane? The motor? The coating?
What makes its THD values drop by minus 15-34dB compared to a non-SL woofer?

PS: someone told me that the differences are not very obvious until you go loud
Yes, a completely different motor, different design of the magnetic system and different material used in the motor. SO basically everything except the cone, the spider and the frame.

I think the biggest differences are best noticed at low to reasonable levels, to hear the details that are revealed below 750Hz or so (crossover is at 380). The design has everything to do with controlling eddy currents, reducing magnetic error, adding to the core ATC idea of short coil/long gap to reduce distortion.

Brad
Old 3rd March 2018
  #37
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Quote:
Originally Posted by midmost View Post
Hi guys,

In hope to get more insight here: does anyone know the technical differences between a SL woofer and a non-SL one?
http://atcloudspeakers.co.uk/wp-cont...E-FINAL-10.pdf
Super Linear Magnet Technology | ATC Loudspeakers

Quote:
Originally Posted by midmost View Post
PS: someone told me that the differences are not very obvious until you go loud
"someone" must be half-deaf. Harmonic distortion is a percentage of the fundamental -- differences are audible at all levels unless you have bad hearing and so need to go to the extremes.
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