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ATC C1 Sub Mk2

Name: ATC C1 Sub Mk2
Brand: ATC
SKU: c1-sub-mk2
Rating: 4.6 (14 reviews)

View at ATC

Built-in Power Amplifier

Compact 12″ Sub suitable for both music and cinema applications
Ideal partner to ATC loudspeakers: SCM7, SCM11, SCM19, SCM40, HTS7, HTS11, HTS40
Ideal partner to ATC Centre Channel Speakers: C1C & C3C
Handmade ATC 12″/314mm driver with massive motor assembly and ribbon voice coil
ATC 200W class A/B amplifier
High Level and Line Level Inputs
Comprehensive user controls to ensure best possible integration with partnering loudspeakers
6 Year warranty

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Overall Score 92/100

Deliciously Crispy

Built around a hand-built 12" driver and 200W MOSFET amp, the C1 Sub Mk2 delivers deep bass with remarkably low distortion and tight dynamics, marrying punch and control for music and cinema. Reviewers like The Ear and Dagogo praise its sealed design, reworked filters and seamless integration.

The Ear

"Its precision pairing with the new C1 Sub amplifier will deliver clean and dynamic low frequencies down to 25Hz (-6dB)."

Pros

Deep, clean LF extension down to ~25Hz with very low distortion from the hand‑built 12" driver and discrete 200W amplifier
Exceptional dynamics and transient control that retain punch and detail for both music and cinema
Robust build quality with real‑wood veneers, improved overload protection and premium finishes

Sound Quality

92/100

Bass

91/100

Reviewers repeatedly praise the low-frequency performance: The Ear notes clean, dynamic LF down to 25 Hz (-6dB) and HomeTheaterHifi called it "very potent for its size" and "tight, punchy, and solid feeling bass." The 200 W MOSFET amp and 12" driver are credited for controlled, low‑distortion output, so the C1 Mk2 delivers exceptional bass for a compact sealed sub.

Dynamics

94/100

Both publications highlight dynamic ability: The Ear describes a "dynamic low-distortion bass foundation" and HomeTheaterHifi found "dynamics to spare" with "no sense of dynamic compression at any volume I dared try." Explosions and transients were rendered convincingly, indicating strong macro and micro-dynamic control.

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Integration

93/100

Outcomes in reviews describe successful blending: HomeTheaterHifi reports the matched system gave a "seamless performance on both movies and music," while The Ear highlights reworked low-pass circuits to "facilitate the best possible integration." These outcome statements support a high integration score rather than relying solely on feature lists.

Build Quality

94/100

Construction is repeatedly praised: HomeTheaterHifi calls the sub "first-rate construction" and "solid as a brick," while The Ear notes hand-built 12" driver, real wood veneers and improved overload protection. The heft and finish (26.2 kg, multiple real-wood finishes) reinforce a premium build impression.

Features Connectivity

82/100

ATC supplies useful analog controls and connections: variable low-pass and all-pass filters, polarity switch, speaker-level binding posts, L/R RCAs and a summed output for chaining. No XLR/DSP/wireless is present (HomeTheaterHifi noted the lack of XLR), so connectivity and control are strong for an analog-focused design but not cutting-edge.

Value for Money

90/100

Reviewers emphasize performance-to-price: The Ear says the sub "belies its price point" (noting a ~£1,650 asking price) and HomeTheaterHifi said the C1 Mk2 "punched well above its weight." Positive value language appears repeatedly, though reviewers stop short of labeling it a no‑brainer or absolute bargain.