User manual

8
3.2 Connection
Mains power and signal connections are required for the C1 Sub-woofer.The mains
cable is specifically supplied to comply with local statutory safety approvals and
alternatives should not be substituted. If you intend to use your sub-woofer in an
alternative territory please contact ATC for advice.The mains connection must always
be earthed. Ensure that the local mains voltage matches that specified on the
connection panel voltage selector.
The audio signal can be connected to the C1 either through the stereo pair of line-
level RCA Phono inputs,or through a stereo set of 4mm binding post connectors.The
binding post connectors are designed to accept high level signals from power
amplifiers but should be used only if an appropriate line level signal is not available.
High level signals from power amplifiers rated at up to 300 Watts into 8 Ohms are
compatible. Take care to ensure that correct, positive to positive and negative to
negative, polarity of high-level connections is retained. Diagram 1 illustrates these
signal connection options.
If two signal connections are made to the sub-woofer (i.e.a stereo pair) the left and
right signals will be summed to mono internally by the amplifier. The mono sub-
woofer signal from an audio-visual processor may be connected to either left or right
line-level Phono input.
The signal cable(s) and plug(s) should be of a good quality.Poor cable and plug quality
will compromise the performance of your sub-woofer.
Installation
C1 Active
Diagram 1 - C1 signal connections
3.1 Sub-woofer Placement
The subjective performance of any sub-woofer will
be fundamentally influenced by the acoustic
character of the room in which it is used, and its
position within the room.Speaker and sub-woofer
systems are most often installed in rooms which
are comfortable to sit and talk in, and the typical
mixture of carpets, curtains and soft furnishings
help ensure that middle and high frequencies are
reasonably well controlled.There may however be
low frequency problems; either too much or too
little bass.
To minimise these problems the sub-woofer
should be kept away from corners or walls. Start
with it positioned around 1 metre from the side
walls and 2 metres from the back.If the balance is
bass-light, the sub-woofer can be moved towards
the corner. Use the sub-woofer controls (see
Section 4.5) to optimise satellite integration and
for fine tuning rather than to compensate for
inappropriate positioning All rooms vary and it is
a good idea to experiment with both listening and
speaker positions until a good compromise is
reached.
If the sub-woofer is to be placed in any form of
enclosure, adequate side and top clearance for
cooling airflow must be provided.For professional
installations the requirements are often very
specific. Please consult with an experienced
professional acoustician if necessary.
More information on sub-woofer installation and
use can be found later in Section 5.
Stereo high level
inputs.Connect to
satellite power
amplifier output if
line-level signal is
not available.
Stereo line-level
inputs.Connect to
line-level signal from
satellite preamplifier
or AV processor.
Sub-woofer