ATC C4 Sub Mk2 Limited Edition

C4 Sub Mk2 Limited Edition

Perfectly complimenting the SCM20ASL Limited Edition, both sonically and visually, the C4 Sub Mk2 Limited Edition brings professional quality sound engineering into your home. This subwoofer is designed and built without compromise and delivers new standards of clarity in the lowest four octaves, enhancing the audio experience for music and film devotees.

ATC sub-bass driver

The C4 Sub Mk2 Limited Edition features the new SS75-314SC sub-bass driver, the first to be purpose-built for an ATC sub-bass system and developed by the R&D team to reproduce the lowest four octaves of the audio band. In order to achieve this, the design exploits ATC’s signature long-gap/short-coil configuration to its natural limits with an exceptionally long 30mm magnetic gap, surrounded by a 6-inch/150mm N48M Neodymium magnet - the most powerful ever assembled by ATC and a first for the company. In support, the wholly redesigned motor system features a new rubber roll-surround for high excursion capability, a new spider for optimised compliance geometry, and high flow motor venting for low noise and compression.

ATC C4 Sub Mk2 12-inch sub-bass driver details

High-excursion rubber roll-surround.
Spider with optimised compliance geometry.
30mm/1.2" magnetic gap energised by high energy neodymium ring magnet.
High flow, low noise motor vent.

As well as minimising distortion, this unprecedented short-coil long-gap configuration ensures the voice coil remains within the motor structure - even at high drive levels - maximising cooling, reducing power compression, and improving reliability. Turbulent air noise within the driver is minimised by a large, flared vent running through the centre of the motor structure, which has the added benefit of increasing voice coil and motor cooling.

ATC C4 Sub Mk2 LE Features:

High performance sealed box design using 12”/314mm ATC proprietary sub-bass driver
Sealed cabinet finished in high-gloss blue with leather upholstered baffle
Ideal partner to SCM20ASL LE
On-board 300W convention cooled discrete MOSFET class A/B amp
2 x balanced XLR inputs
2 x balanced XLR outputs (un-filtered/processed)
User adjustable gain, low pass frequency, polarity and phase settings
Hand-built in England
6 Year warranty

ATC 12-inch SS75-314SC sub-bass driver

Specifications

Acoustic Specifications
Drive Unit – Bass: 1 x SS75-314SC 8Ω
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 8Ω
THD+N: <0.003%/-90dB, at 100Hz, 300W into 8Ω over 90kHz bandwidth
Balanced Inputs: 2 x Rear Panel Mounted Female XLR, pin 2 hot
Input CMRR: 90dB at 200Hz
Input Impedance: 20kΩ (differential)
Balanced Outputs: 2 x Rear Panel Mounted Male XLR, pin 2 hot
Output Impedance: 100Ω (differential)
Frequency Response: <2Hz (-3dB) – 320Hz (-6dB, set by panel-controlled LP filter)
Low Pass Filters: 4th Order Linkwitz Riley
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
Limiter: ATC Active FET Momentary Gain Reduction.
Sensitivity: 1.55Vrms for full power (single channel driven, Gain 0dB, Level 0dB)
Mains Input: 220-230V or 115V – Factory set. Please observe panel markings and labels!
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*.
*Footswitch supplied separately, latching type, ¼”/6.35mm jack connection.

Physical Specifications
Net Weight: 42kg
Dimensions: (H x W x D): 568 x 465 x 519mm. Heatsink protrudes a further 40mm from rear and optional spikes add an additional 22mm to height (see diagram)

Handbook

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