ATC C4 Sub Mk2
Image source — © ATC
Model name
C4 Sub Mk2
Frequency Response low +/- 3dB (Hz)
22 (-6dB)
Frequency Response high +/- 3dB (Hz)
N/A
Sensitivity (dB at 1 W/1m)
N/A
Impedance (Ohms)
N/A
Has internal amplification
Yes
Power amplifier requirements (W)
300
Size (sm)
56.8 x 46.4 x 50.0
Weight (kg)
42
Official link
The subwoofer received a 375 mm driver and a powerful amplifier capable of producing 450 watts at the output.
The ATC C1 Sub Mk2 is powered by a 200W Class A/B MOSFET power amplifier in a common source circuit with a new enlarged power supply section. This combination allows the ATC C1 Sub Mk2 to achieve very low bass of 25 Hz (-6 dB) while maintaining the highest sound quality.
The subwoofer is equipped with a 12” woofer (SS75-314SC) of its own design and an AB-class discrete amplifier. It also has the ability to turn off/on remotely using a series-connected footswitch with a lock, without affecting the through connectors of full-range monitors (footswitch is supplied separately).