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 articially low level and carefully increase the volume. It is also possible for the ATC systems to produce sucient 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 loudspeakers. If the subwoofer
is audible as a separate element, then it is likely the level is too high, the lter settings require adjustment, or the positioning can be improved. Please
refer to Section 5 of this manual.
High technology material nishes 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 nishes clean.
Heavy soiling of the cabinet or bae can be cleaned using a cloth slightly moistened with a non-abrasive household cleaner. Dust can carefully be
removed from the drive unit with the use of a dry, lint free cloth.
There are no components within the speakers that can be considered expendable, or that would benet 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 condence in the quality of each product that it manufactures.
Low Frequency Cut-o: 22Hz (-6dB, half space, low pass lter 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 lter set at 80Hz).
Sensitivity: +4dBu ref. 88dBC (single channel driven, measured at 1m, Gain +6dB, Level 0dB, pink noise, low pass lter set at 80Hz).
Amplier 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. 20kΩ (dierential).
Line Output Impedance: Approx. 100Ω (dierential).
Frequency Response: <2Hz (-3dB) – 320Hz (-6dB, set by panel-controlled LP lter).
Low Pass Filters: 4th Order Linkwitz Riley.
Gain Control: 0, +6dB, +10dB.
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.
Sensitivity: 1.55Vrms for full power (single channel driven, Gain 0dB, Level 0dB).
Power Consumption: Idle 8W / 14 VA , 1/8th Power 17 0 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
7.1
8 .1
SECTION SEVEN SECTION EIGHT
SECTION NINE
Acoustic specification
Electronic specification
9.1
9.2
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