Hum problems resulting from unbalanced connection
may be reduced by making one of the following
modications to the signal cable connections: If the
driving preamplier (or desk) is ‘double insulated’
(i.e. has no mains earth), disconnect the signal cable screen
at the RCA Phono plug end. Alternatively, disconnect
the signal cable screen at the XLR end. This second option
will make the source the reference signal earth.
This button powers the subwoofer on or o. When the
button is in the inward position, the loudspeaker is
powered on. When the button is in the outward position,
the subwoofer is powered o.
Sets the overall sensitivity of the subwoofer. Initially, the
Level control should be set towards the centre of its
range and only adjusted once the Frequency has been set.
If one Input is connected, start with the Gain switch
set at +6dB. If both Inputs are connected, start with the
Gain switch set at 0dB.
An additional +10dB gain setting is included for situations
where the preceding equipment can only deliver
a low output level. Please note that increasing the gain
does not increase the maximum acoustic output
capability of the system.
Please refer to Page 14 – Product Specications for
information on system sensitivity.
Sets the overall polarity of the subwoofer and oers
an adjustment of the Input/Output Phase. When set to
+ and 0° the subwoofer will radiate a positive acoustic
pressure for a positive electrical signal at the Input.
When set to – and 0° the subwoofer will radiate in the
opposite polarity to the Input. The Phase control allows
for ne adjustment of the Phase relationship between
subwoofer and satellite speakers. This can be thought of
as a delay, allowing for time alignment with other
system elements and is useful when physical adjustment
of loudspeaker/sub position is limited.
Varies the low pass crossover Frequency as indicated
on the control panel. This is the fundamental parameter
that denes the integration of the subwoofer with
the satellites. The Frequency control should be set at,
or slightly above the specied low frequency cut-o
of the satellite speakers.
The ‘open’ setting applies a low pass lter at 320Hz.
Select this setting if you will apply the sub low pass
crossover lter via an external processor.
All lters are of the 4th order Linkwitz-Riley type.
Provides separately buered and fully balanced Outputs
with a signal identical to that at the corresponding Input
terminals. The Output is unltered and unaltered in any
way, and therefore it is possible to drive a stereo amplier
or pair of active loudspeakers from these terminals.
Likewise, it is also possible to drive a second C4 Sub
Mk2 from these Outputs. This function allows for
an unlimited number of C4 Sub Mk2s to be daisy chained
together, one driving the next.
Facilitates remote muting of the subwoofer with the
addition of a standard latching footswitch (not supplied).
If the system includes more than one C4 Sub Mk2, a
second subwoofer can be controlled from the Thru
Output socket. This allows for all subwoofers in a system
to be controlled simultaneously from one footswitch. The
signal at the Output sockets is not aected.
Indicates a temporary or permanent amplier fault.
The Fault LED will illuminate if there is a DC fault on the
amplier or if the thermal limit of the heatsink is
reached. In the rare case that the Fault LED illuminates,
the subwoofer should be switched o. Ensure the
subwoofer heatsink has adequate ventilation and after
45 minutes switch it back on. If the Fault LED remains
illuminated the amplier is registering a fault which should
be investigated by an approved technician. Please contact
your ATC dealer or distributor, details can be found at
www.atc.audio. If the Fault LED is no longer illuminated,
the amplier had shut down safely due to reaching
high temperatures. Please reduce the system listening
level, subwoofer Level or improve amplier ventilation
and continue to use the subwoofer.
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