ATC Consumer Hifi C4 Sub mk2

Product description

The C4 Sub mk2 is a new 12" active subwoofer for the Hi-Fi, AV and home cinema markets. It shares its styling with the 'Classic' and 'Tower' series loudspeakers. Its size & performance make it a natural partner to the SCM20, SCM40, SCM50 and SCM100. Multiple subs can be used in situations requiring higher sound pressure levels.

The C4 Sub MK2 is an all new design featuring ATC's first sub-bass driver, designed specifically to reproduce the lowest three octaves of the audio band. The SS75-314SC sub-bass driver is shown above and it's key features are:
1. New rubber roll-surround for high excursion capability.
2. New spider for increased excursion and featuring optimised compliance geometry.
3. 30mm magnetic gap & high-energy neodymium ring magnet deliver high force factor over +/-15mm range
4. High flow motor venting for low noise and compression.

Like all ATC loudspeaker systems, the driver is the key element to the system performance. It allows the sub to deliver an extended low-frequency response without employing electronic equalisation, quite unlike many subwoofers available today. Instead, the more elegant combination of exceptional transducer engineering and a marginally larger cabinet volume is used. The simplicity of this approach reduces phase shift and group delay, aiding the integration of the sub with the partnering loudspeakers.

ATC's electronic engineering team have delivered an all-new amplifier for the new subwoofer. The 300W class AB design is hand-built here at ATC and precisely optimised to the requirements of the drive unit, resulting in fast, dynamic bass with minimal colouration. Two balanced inputs provide connectivity suited to both stereo and multi-channel/immersive audio systems plus two balanced outputs provide connections to 'main' loudspeakers or to 'daisy-chain' multiple subs.

Overview
The ATC C4 Sub Mk2 is a 12”/300mm active subwoofer, designed to deliver the exceptional levels of performance demanded by audiophiles and film & music lovers, and integral to partnering with ATCs range of mid-size Hi-Fi loudspeakers. It’s performance and features make it well suited to both music and audio-visual applications.

Key Features
• Size & performance partner to SCM20, SCM40, SCM50 & SCM100 loudspeakers.
• Styled to match ‘Classic’ & ‘Tower’ Series products.
• ATC hand-built long-throw 12”/300mm SS75-314SC subwoofer driver.
• ATC discrete MOSFET class AB power amplifier.
• Heavily braced & inert sealed enclosure.
• Stereo balanced inputs & stereo ‘Link’ balanced outputs.
• Level, Low-Pass Frequency, Polarity & Phase user controls.
• Available in a wide range of hand-selected veneers plus satin black & satin white painted finishes.
• Hand-built in England and covered by a 6 year warranty.

Acoustic Specifications
Drive Unit – Bass: 1 x SS75-314SC 8O.
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: 110dB continuous, 116dB peak (IEC Weighted Pink Noise, 1m, half space, low pass filter @80Hz).
Sensitivity: +4dBu ref 88dBC (single channel driven, Gain +6dB, Level 0dB, pink noise, low pass filter @80Hz).

Electronic Specifications
Amplifier type: Grounded Source MOSFET based Class A-B, convection cooled.
Output Power: 300W into 8O.
THD+N: <0.003%/-90dB, at 100Hz, 300W into 8O over 90kHz bandwidth.
Balanced Inputs: 2 x Rear Panel Mounted Female XLR, pin 2 hot.
Balanced Outputs: 2 x Rear Panel Mounted Male XLR, pin 2 hot.
Frequency Response: <2Hz (-3dB) – 320Hz (-6dB, set by panel-controlled LP filter).
Gain Control: 0, +6dB, +10dB.
Level Control: 0dB -11dB 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.
Power Consumption: Idle 8W/14VA. 1/8th Power 170W/230VA. Full Power 500W/600VA.
Additional: Mute via ¼”/ 6.35mm Jack socket, controlled via latching footswitch (supplied separately)

Physical Specifications
Dimensions (H x W x D): 568 x 465 x 519mm
22 5/16 x 18 5/16 x 20 7/16 inches
Heatsink protrudes a further 40mm / 1 9/16 inches from rear. Spikes increase this height by a minimum
of 22mm/7/8”. See data sheet (to follow) for a detailed drawing.
Net Weight: 42kg / 92.5lbs.

Burr Walnut: p.o.a.