In the late 90s and early 2000s, the
recording industry was beginning to use
higher resolution digital formats, with 96kHz
& 192kHz PCM recordings becoming more
common. Sony had developed DSD, a single
bit digital audio format using a 2.8224 MHz
sample frequency and also Super Audio
CD (SACD) the physical media that DSD
recordings would be delivered on. All these
changes resulted in recordings with an
extended high frequency bandwidth, and it
was no coincidence that in 2002, ATC
updated and improved the SCM20 again, with
a move to a new 25mm/1” tweeter from
Seas which, provided slightly lower coloration
and extended the high frequency response.
Improvements to the SCM20 high frequency
response were made again in 2014, with
the arrival of ATC’s in-house designed and
built S H 25 -76 S dual-suspension tweeter,
developed by Billy Woodman and ATC’s ne w
engineer, Richard Newman. This 1”/25mm
soft dome part had been in development for
many years and improved the performance
of the SCM20 and larger top-end models
via lower distortion and an extended high
frequency response. Signicantly, it also
marked the move to building the majority
of high frequency drivers in-house, after
many years of out-sourcing.
2024 SCM20ASL
LIMITED EDITION
RELEASED
1997 BI-AMP
(4 TERMINAL)
INPUT PANEL
FROM THE
SIGNATURE
MODEL ADDED
AS STANDARD
1998 ACTIVE
FLOOR-STANDING
SC M20A S LT
MODEL
LAUNCHED
2002 SCM20SL
UPDATED WITH
NEW SEAS 1” SOFT
DOME TWEETER
AND REVISED
CROSSOVER
2014 SCM20SL
UPDATED WITH NEW
ATC MANUFACTURED
SH25-76S ‘S-SPEC’
DUAL-SUSPENSION
TWEETER AND REVISED
CROSSOVER
1996 SCM20SL BILLY
WOODMAN SIGNATURE
MODEL RELEASED WITH
EBONY VENEER AND
TERMINAL PANEL
BI-AMP (4 TERMINAL)
INPUT PANEL
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