ATC SCM7 Entry Sub Operating Instructions page 2

Level – Shown by 'L' on the front display:
Sets the overall input sensitivity of the subwoofer. Initially the level should be set towards the centre
of its range (50) and only adjusted once the upper filter cut-off frequency has been set.
Filter Frequency – Shown by 'Fr' on the front display panel:
Varies the upper low-pass crossover frequency.
frequency is the fundamental parameter that defines how the
subwoofer integrates with the
satellite/main loudspeakers. The filter frequency should be set at,
or just above the cut-off frequency of the satellite/main
loudspeakers. To the right is a table of recommended initial filter
settings for the C1 Sub when used with ATC satellite/main
loudspeakers.
Phase – Shown by 'Ph' on the front display panel:
Changes the phase of the acoustic output signal with reference to the input signal. This can be used
to improve the integration of the sub – satellite/main loudspeakers by correcting for phase problems
due to different distances from listener to sub and satellite/main loudspeakers. This can be set by
listening to well known material and choosing the preferred setting or, by using a test tone. If using
the test tone method, select a tone at, or very close to the sub-satellite crossover frequency and play it
back through the sub and satellite loudspeakers. Flip the phase setting and listen to which gives the
highest total output. Alternatively, a sound level meter could be used to measure the level.
Display Brightness – Shown by 'Br' on the front panel display
Varies the brightness of the front panel display, a higher number leading to a brighter display.
Display On/Off – Shown by 'Sc' on the front panel display
The following options are available from this menu:
0 The display stays lit all the time
1 The display stays lit all the time, at the users selected brightness level, and then automatically
changes to minimum brightness after 30 seconds.
2 The display stays lit, at the users selected brightness setting for 30 seconds then turns off.
Note: Quality and level of low frequency sounds can vary enormously in different areas of a typical
room. It is preferable to listen/measure at in more than one location in order to achieve the optimum
setup unless the listening area is very small.
Fig. 2 Front Display and Encoder Panel
The filter
Stereo
Loudspeaker
Model
SCM7
SCM11
SCM19
SCM40
Recommended
Initial Sub Filter
Setting
60
56
54
48