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C1 Active

Sub-woofer Installation

3.3 Operation

The C1 sub-woofer control and connection panel provides a range of adjustment

facilities to assist its integration with the satellite speakers. These facilities are

explained below and illustrated in Diagrams 2,3 and 4.

Level:Sets the overall sensitivity of the sub-woofer.

Initially the level control should be set towards the

centre of its range and only adjusted once the

Filter Frequency and Mode controls have been set.

Filter Frequency: Varies the upper crossover

frequency as indicated on the control panel and

Diagram 3. Filter frequency is the fundamental

parameter that defines the integration of the sub-

woofer with the satellites. The Filter Frequency

control should be set at or slightly above the

specified low frequency cut-off of the satellite

speakers.

If the Filter Frequency control is set fully anti-

clockwise, a supplementary control providing

alternative fine adjustment of filter frequency

between 40 and 100Hz becomes operational.

Mode:With the Mode control set to the Music+ position the sub-woofer pass-

band frequency response is fundamentally flat and in phase with the satellite

speakers.With the Mode control to the Music– position the frequency response

remains flat but the phase is reversed. Depending on the relative position of the

sub-woofer and satellite speakers within the listening environment,phase reversal

can result in more consistent integration.The Music position is recommended for

music programme material. The response curves for each Low Pass filter position

with Music+ selected is shown on the control panel and in Diagram 3.

With the Mode control in the Theatre+ position the frequency response is lifted

in the 40 - 60Hz region.This boosted setting is designed to provide a more

demonstrative sub-woofer performance appropriate for audio/visual programme

material.The response curves for each Low Pass filter position with Theatre+

selected is shown on the control panel and in Diagram 4. The Theatre– position

retains the frequency response but reverses the phase.

Due to the nature of the electronics in ATC active loudspeakers it is quite normal

for a sound to be heard from the speaker when the power is applied or

disconnected.The noise heard will not damage the speaker and is quite normal.

Although ATC uses the highest-grade components, a different noise may be heard

from each speaker due to slight tolarance variations in the amplifier components.

3.4 Listening

The ear and brain tend to interpret distorted sound as loudness and thus

underestimate the actual level of undistorted sound.ATC sub-woofers, like all ATC

products,demonstrate very much lower levels of distortion than conventional systems

of a similar size and it is therefore advisable to begin listening at an artificially low level

and carefully increase the volume.It is also possible for the ATC systems to produce

Diagram 2 - connection and control panel

Diagram 3 - low pass options, music mode

Diagram 4 - low pass options, theatre mode

Off

200Hz

120Hz

60Hz

40Hz

15dB

10dB

5dB

0dB

-5dB

-10dB

-15dB

Off