ATC SCM25A Pro Mk2 Review: An Exceptional Midrange

The ATC SCM25A Pro Mk2 has a midrange presentation without equal in our experience. Properly positioned, these monitors disappear, leaving the recording to hold our attention. They are expensive, impeccably constructed and somewhat retro in appearance, but the performance makes a powerful case for them.

Our experience

We never had the opportunity to use the original SCM25A, so we cannot offer a firsthand judgment of the improvements between generations. This review reflects our experience with the Mk2.

What stands out is the midrange. It is the defining strength of these monitors for us, and the reason we continue to value them. Correct positioning matters: the ability to disappear is something we hear when the monitors are properly placed.

These are substantial speakers that deserve substantial stands. We use Sound Anchors to keep ours securely and consistently positioned. Budgeting for suitable support belongs alongside budgeting for the monitors themselves.

The design

The SCM25A Pro Mk2 is an active three-way monitor with a 6.5-inch bass driver, ATC’s 3-inch soft-dome midrange and its own 1-inch dual-suspension tweeter. Each driver has dedicated Class A/B amplification. The Mk2 replaces the original model’s third-party tweeter with ATC’s SH25-76S; that is a documented design change, rather than a listening comparison we have made.

The connection is balanced analog XLR. There are no digital inputs, and the controls are limited to input sensitivity and bass boost. There is no onboard room-correction system. We do not feel shortchanged by this simplicity, although careful room setup and placement still matter.

Where ours ended up

We ultimately chose the larger SCM45A for the room with our API console, where its extra bass and slam suited us. We kept the SCM25A Mk2 pair in our B room. That is a change in role, rather than a loss of enthusiasm for the smaller monitors.

The tradeoffs

Cost is the obvious obstacle. The traditional cabinet styling will also seem retro to anyone looking for a more contemporary appearance. The construction, however, is impeccable, and the need for high-quality stands is a practical part of owning them.

For us, the midrange presentation and the way these monitors disappear when positioned correctly outweigh those reservations. Incredible monitors, and an easy recommendation based on our experience.

Key specifications

Design	Active three-way nearfield monitor
Amplification	150 W bass / 60 W midrange / 32 W treble
Acoustic cutoffs	47 Hz–25 kHz (−6 dB; manufacturer specification)
Input	Balanced analog XLR
User controls	Input sensitivity; 0 to +3 dB bass boost

Technical references: ATC product information and technical data sheet. Listening impressions and studio-use details are our own.