Description C4 Sub Mk2 The C4 Sub Mk2 by ATC delivers 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 monitor loudspeakers. Ultimately, it delivers a more balanced and coherent experience for the listener, extending the low-frequency response without masking details or changing the tonal character in the upper bass / lower mid-range. Drawing on 34 years of experience in amplifier design and development, ATC’s electronic engineering team have delivered an all-new amplifier for the new subwoofer. The 300W class AB design is hand-built by A TC at their UK facility 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 AV/home cinema systems plus two balanced outputs provide connections to partnering loudspeakers or to ‘daisy-chain’ multiple subs. Low-pass filters are analogue, 4th order Linkwitz-Riley and filter frequency options ensure optimal integration with a wide range of studio monitors. An industry-standard 80 Hz low-pass plus an off option (for use with external processing) are also provided. A polarity switch plus a continuously variable 180° phase adjustment allows further optimisation of the subwoofer crossover, and a stepped attenuator with a 21 dB range provides precise level matching. Features High performance sealed box design using 12-inch / 314 mm ATC proprietary sub driver. Ideal partner to SCM19, SCM20, SCM40, SCM50, SCM100 loudspeakers. Suitable for use in stereo / AV / home cinema applications. On-board 300 W convention cooled discrete MOSFE T class A/B amp. 2 x balanced XLR inputs. 2 x balanced XLR outputs (unfiltered / processed). User adjustable gain, low pass frequency, polarity and phase settings. Specifications Amplifier: Grounded Source MOSFET based Class A-B, convection-cooled. Output Power: 300 W into 8 Ω THD N: <0.003 % / -90 dB, at 100 Hz, 300 W into 8 Ω over 90 kHz bandwidth Balanced Inputs: 2 x Rear Panel Mounted Female XLR, pin 2 hot Input CMRR: 90 dB at 20 0Hz Input Impedance: 20 kΩ (differential) Balanced Outputs: 2 x Rear Panel Mounted Male XLR, pin 2 hot Output Impedance: 100 Ω (differential) Frequency Response: <2 Hz (-3 dB) – 320 Hz (-6 dB, set by panel-controlled LP filter) Low Pass Filters: 4th Order Linkwitz Riley Gain Control: 0 / 6 / 10 dB Level Control: 0 dB – 11 dB in 1 dB steps. Polarity Control: In-phase / Out-of-phase ref. Input Limiter: A TC Active FE T Momentary Gain Reduction. Sensitivity: 1.55 V rms for full power Mains Input: 220-230 V or 115 V, factory set. Power Consumption: Idle 8 W / 14 VA. 1/8th Power 170 W / 230 VA. Full Power 500 W / 600 VA. Bass Drive Unit: 1 x SS75-314SC 8Ω Low Frequency Cut-off: 2 2Hz (-6 dB, half space, low pass filter set at 80Hz). Low Pass Filters: 50 / 65 / 80 / 320 Hz. (-6 dB, 4th order Linkwitz Riley). Max SPL: 110 dB continuous, 116 dB peak. Sensitivity: 4 dBu ref. 88 dBC. Dimensions: (H x W x D): 568 x 465 x 519 mm Heatsink: Additional 40 mm depth. Optional Spikes: Additional 22 height. Net Weight: 42 kg Shipping Weight: 64 kg Full ATC Range Available Unilet Sound & Vision are official retail partners for ATC Loudspeakers, providing sales, advice and assistance on their entire range of high-quality audio products. Please do get in touch if you would like a demonstration or wish to purchase. More Information C4 Sub Mk2, by ATC Loudspeakers
