Manual

The ear and brain tend to interpret distorted sound as loudness and thus underestimate the actual level of undistorted sound. ATC subwoofers,
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 sufficient sound pressure
levels for your ears themselves to become a source of distortion and make the sound appear harsh. Any audible distortion indicates that either the
system or your ears are being overloaded and that the volume level should be reduced.
When a subwoofer is successfully integrated into a system it should become impossible to discern from the main monitors. If the subwoofer is
audible as a separate element, then it is likely the level is too high, the filter settings require adjustment, or the positioning can be improved. Please
refer to Section 5 of this manual.
High technology material finishes are used in this product. The surfaces are durable and with a little care can be kept as good as new even under
conditions of heavy use. Normally, a dry duster will be all that is required to keep the finishes clean.
Heavy soiling can be cleaned using a cloth slightly moistened with a non-abrasive household cleaner.
There are no components within the speakers that can be considered expendable, or that would benefit from regular maintenance. There is no
requirement for any kind of routine service work and there is no schedule for preventative maintenance. There are no user-replaceable parts within
the speaker, and in the unfortunate event of any malfunction, repair should be referred to either the supplying dealer or consultant, the relevant
importer, or ATC. ATC has every confidence in the quality of each product that it manufactures.
Low Frequency Cut-off: 22Hz (-6dB, half space, low pass filter set at 80Hz).
Low Pass Filters: 50Hz, 65Hz, 80Hz, 320Hz. (-6dB, 4th order Linkwitz Riley).
MaxSPL: 11 0 dB continuous, 11 6 dB peak (IEC Weighted Pink Noise, measured at 1m, half space, low pass filter set at 80Hz).
Sensitivity: +4dBu ref 88dBC (single channel driven, Gain +6dB, Level 0dB, pink noise, low pass filter set at 80Hz).
Amplifier type: Grounded Source MOSFET based Class A-B, convection cooled.
Output Power: 300W in to 8Ω.
THD+N: <0.003%/-90dB, at 10 0 Hz, 300W into 8Ω over 90kHz bandwidth.
Input CMRR: 90dB at 200Hz.
Input Impedance: Approx. 20kΩΩ(differential).
Output Impedance: Approx. 100ΩΩ(differential).
Frequency Response: <2Hz (-3dB) – 320Hz (-6dB, set by panel-controlled LP filter).
Low Pass Filters: 4th Order Linkwitz Riley
Gain Control: 0, +6dB, +10 dB.
Level Control: 0dB -11 dB in 1dB steps. Total range 21dB with use of Gain switch.
Phase Control: 0-180° ref. Input.
Polarity Control: In-phase/Out-of-phase ref. Input.
Limiter: ATC Active FET Momentary Gain Reduction, active limiter indicated on front panel.
Sensitivity: 1.55Vrms for full power (single channel driven, Gain 0dB, Level 0dB).
Power Consumption:
Idle 8W / 14VA ,
1/8th Power 170 W / 230VA,
Full Power 500W / 600VA.
Mains Input: 220-230V, 115V – Factory set. Please observe panel markings and labels.
Additional: Mute via ¼”/ 6.35mm Jack socket, controlled via latching footswitch.
Listening
Care and Maintenance
7. 0
8.0
SECTION SEVEN SECTION EIGHT
SECTION NINE
Acoustic specification
Electronic specification
9.1
9.2