Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
Product Strengths
- 'Ridiculous' detail and clarity allow the user to notice subtle elements in familiar recordings
- Easier to identify and isolate problems within a mix due to its clarity and detail across the frequency range
- Higher frequencies are airy, crystal clear, and pleasant, even at high monitoring levels, resulting in minimal ear fatigue
- Low end is tight and focused, even in the sub frequencies
- Stereo image is very wide with a tight focused center
Product Considerations
- A little light on the low end
- Heavy and require good stands
- Footprint is rather large for a nearfield speaker, so they may not integrate well into a small room
- One reviewer found that the mono center sounds very diffused
Comparisons (according to reviewers)
- Vs ATC SCM25A: The 45 makes room for a second 6.5' low-frequency driver, reducing non-linear distortion—and increasing total output by 3dB
Takeaway: The SCM45a provides amazing clarity and detail, making it easier to mix and master audio. They sound great across many genres, and make it easier to hear every part of your music.
All
SCM45a Pro
reviews

Manufacturer details
- Drivers: HF 1"/25mm Dual-Suspension 'S-Spec', Mid 3"/75mm Soft Dome, LF 6.5"/164mm short-coil carbon paper cone
- Amplitude Linearity (±2dB): 70Hz-17kHz
- Cut-off Frequencies (-6dB, free-standing): 42Hz-25kHz
- Dispersion: ±80° Coherent Horizontal, ±10° Coherent Vertical
- Max. Continuous SPL (1 metre): 112dB
- Audio Input: Rear panel mounted female xlr (pin 2 +)
- Input Sensitivity: 1V rms (ref. full output)
- Input Sensitivity Trim: 0dB to -6dB/1V – 2V
- Input Impedance: Balanced > 10kΩ
- Amplifier Output Power: Bass 150W rms, Mid 60W rms, High 25W rms
- Crossover Frequencies: 380Hz & 3.5Khz
- Crossover Filters: 4th order critically damped with phase compensations
- Low Frequency Boost: 0dB to +3dB at 40Hz
- Dimensions (HxWxD): 353 x 600 x 375mm (13.9˝ x 23.6˝ x 14.8˝)
- Weight: 36kg / 79.2lbs (per cabinet)
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- ATC's commitment to in-house driver design and manufacturing allows for tight control over performance characteristics and seamless integration across their entire product line.
- They primarily use active designs with electronic crossovers and dedicated amplifiers for each driver, optimizing power delivery and minimizing distortion compared to passive crossovers.
- ATC speakers prioritize accuracy, neutrality, and wide dynamic range, resulting in a sound signature that may expose flaws in recordings or upstream components.
Select products
SCM7 MK3
- Positioning: The entry-level model in ATC's loudspeaker lineup.
- Description: Features a compact design and precise sound, with a 25mm soft dome tweeter and a 125mm mid-bass driver. Compared to the SCM19, it offers a smaller footprint, making it ideal for small rooms or desktop setups, but it lacks the larger bass driver and higher sensitivity found in the SCM19.
SCM19
- Positioning: A mid-range model in the Entry Series, offering a balance between performance and size.
- Description: Features an "SL" spec bass driver and 75mm integral soft dome, providing excellent phase coherence and bass response. It offers a more robust soundstage than the SCM7 MK3.
SCM19A
- Positioning: An active version of the SCM19, positioned as a higher-end option within the Entry Series.
- Description: Includes an on-board 182-watt Class A/B bi-amplifier, delivering enhanced sound clarity and power. It uses active crossover filters, unlike the passive SCM19, which requires external amplification.
SCM40A
- Positioning: The groundbreaking flagship model of the Entry Series, offering the most advanced features and performance.
- Description: Equipped with a tri-amplifier system and a 164mm bass driver, providing exceptional sound quality and dynamic range. It surpasses the SCM19A with its additional mid-range driver and higher power output.
Our take on the brand
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Used
ATC
What if you spend more?
What competes at this price?
Our Summary
Product Strengths
- Unparalleled clarity, definition, and utmost accuracy
- Excellent bass extension and clarity, as well as proper tonal balance at every volume
- Super wide dispersion, and thus a bigger sweet spot
Product Considerations
- It would be overkill in smaller rooms
- A pair is a significant investment, so it makes sense that it's geared toward large, professional recording environments
- They weigh nearly 100 pounds apiece
Takeaway: The PMC 8-2 is a wise investment for professional studios that delivers detailed and accurate monitoring, so it could very well be the only monitor needed It uses proprietary technology to deliver its signature sound
Video review
Our take on the brand
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