ATC SCM20PSL Pro 2-Way Passive Monitor (Pair)

$3,290.00

6.5-inch, passive 2-way speaker with SL woofer

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SKU: ATCSCM20PSLMK2 Categories: , Brand:

ATC SCM20PSL Pro is a very high-performance, 2-way passive nearfield monitor with 6″ bass/mid driver and proprietary dual-suspension 1″ tweeter

The ATC passive SCM20PSL PRO studio monitors present an affordable opportunity for home and project studios to experience the advantage of ATC’s superior performance. Used by world-class studios, engineers, artists, and post-production facilities, the SCM20PSL is a passive hybrid design incorporating a 6″ bass/mid driver with a 3″ soft dome for midrange assist. The woofer magnet assembly features ATC’s super linear magnet technology, which dramatically reduces third-order harmonic distortion by 10-15dB between 100HZ-3kHz. The result is a significant improvement in detail, clearly revealing ambient sounds and low-level effects, previously hidden. The SCM20PSL PRO features a conventional cabinet for easy placement on any meter bridge (ATC recommends using stands behind the meter bridge for better performance).

ATC SCM20PSL Pro in one take:

  • Compact, very high performance, passive 2-way studio monitor
  • For critical nearfield listening applications in all control rooms; LCR surround monitoring in small-to-medium control rooms; or surround channels in medium-to-large control rooms
  • Proprietary ATC 6″ (150mm) super linear mid/bass driver
  • Proprietary ATC 1″ (25mm) dual-suspension ‘S-Spec’ tweeter
  • Six-year warranty

Power recommendation

The SCM20PSL Pro monitors are equipped with a bi-wire connection panel to enable separate amplification of the bass/mid driver and tweeter. Recommended power is 75 – 300 watts, with 200W per channel being optimal. For those who already have good power amplification, the Passive 20 loudspeaker enables those who’ve long desired ATC’s high-performance monitors at half the price of their active models. Or, if you prefer keeping the electronics out of the speaker cabinet, the ATC P1 Pro dual mono power amplifier or P2 Pro are a perfect match.

Who Using ATC?

ATC users range from artists such as Sting, Pink Floyd, The Rolling Stones, Eric Johnson, Enya, Kate Bush, film composer, James Newton Howard, and many more. ATC users include producer-engineers known for their discriminating ears, such as Bruce Swedien, Hugh Padgham, Chuck Ainley, Ed Cherney, producer-engineer-equipment designer, George Massenburg, mastering engineer Bob Ludwig, and John McBride of Blackbird Studios. ATC monitors are also in use at recording studios, soundstages and broadcast facilities, such as East West Studios, Air London, Sony Music Studios, Paramount Studios, Warner Brothers, and BBC UK, to name a few. Even pro audio equipment manufacturers who depend on critical listening for product design depend on ATC, including Shure Microphones and Dolby Laboratories.

ATC Technology:

ATC makes what many consider to be the world’s finest studio monitors, as evidenced by a client list that reads a who’s who of artists, engineers, recording studios, film, post, and broadcast facilities, as well as pro audio manufacturers and educational institutions. Obviously, it takes an attention to fine detail and proprietary technology. Let’s take a closer look at ATC technology.

Linear off-axis response:

To achieve superior loudspeaker performance, there must be a balance between all measured characteristics, including magnitude response, phase response, power response, time domain response, distortion characteristics, and power handling.

Starting with the off-axis response of the loudspeaker, ATC engineers ensure that the phase relationship of the drivers maintain a linear response.

Bass/mid driver soft dome

Soft domes are fixed to the edge of the voice coil, which is 3″ (75mm) in diameter. The dome is designed to decouple from the cone at higher frequencies, where it performs the role of the primary acoustic radiator.

Proprietary soft dome tweeter

In order to maintain the highest levels of performance, ATC controls all aspects of the loudspeaker system to ensure the lowest levels of linear and non-linear distortion. Along with manufacturing their own bass, bass/mid, and midrange drivers, ATC couldn’t rely on OEM or stock designs, and spent considerable time creating a soft dome tweeter to meet their high standards.

Proprietary soft dome tweeter

 In order to maintain the highest levels of performance, ATC controls all aspects of the loudspeaker system to ensure the lowest levels of linear and non-linear distortion. Along with manufacturing their own bass, bass/mid, and midrange drivers, ATC couldn’t rely on OEM or stock designs, and spent considerable time creating a soft dome tweeter to meet their high standards.

Nearly all 1″ (25mm) tweeters use a voice coil suspended in the magnetic gap of the motor immersed in ferro-fluid. The fluid adds mechanical damping, transferring heat to the metalwork and suppressing rocking modes. Over time the fluid starts to thicken presenting resistance to the moving coil assembly, causing the magnitude response to decline.

ATC endeavored to design a tweeter free from the limitation of ferro-fluid while simultaneously overcoming the engineering problems that arise without its use. As with all ATC drivers, the tweeter was approached with optimum performance in mind.

Borrowing the dual suspension technology from their midrange soft dome, which forces the use of a larger voice coil, ATC used extremely large, high-grade neodymium magnets in the motor assemblies to get the required efficiency and top-end extension. ATC also heat-treats the top plate (magnetic annealing) to squeeze that bit extra performance out of the components. Large, well-designed motors mean lots of flux in the gap, which in turn results in extremely low odd-harmonic distortion, an extended magnitude response, and an excellent time-domain characteristic.

Bass/Mid driver construction

ATC drivers feature massive magnet motor assemblies, with no-compromise optimization for each voice coil diameter. Hand-wound voice coils use only high-density, edge-wound, flat OFHC (oxygen-free high thermal conductivity) ribbon copper wire and operate in precision magnetic gaps. Front and rear venting not only reduces airflow noise, but also increases power handling capacity, and therefore, long-term reliability.

Speaker directivity

 The perceived sound quality of a loudspeaker is dependent on its power response, particularly when listening to high-energy transients. As such, high-performance loudspeakers should exhibit a broad and even dispersion with frequency—a factor that ATC takes great care to achieve.

ATC’s largest bass/mid driver is 6.5″ with a crossover of around 2.5kHz, which ATC engineers consider to be a practical limit in a 2-way. In a 2-way system capable of high dynamic range, an ideal crossover point has to be compromised a little to minimize HF driver distortion and increase reliability. If the bass/mid driver was significantly larger, it would become more directional, causing the horizontal response around crossover to suffer. As driver diameter increases to achieve greater bass extension and higher SPL, maintaining good off-axis response would require the move to a three-way system.

Short throat waveguide

ATC tweeters have a carefully designed short-throat waveguide. Deeper throats would affect the balance of the device, both on- and off-frequency, and if taken to the extreme would further increase distortion. At the chosen crossover frequency, ATC’s 25mm tweeter effectively radiates omni-directionally as desired.

In summary

ATC believes that the key to superior performance is designing drivers and systems for use at high levels, and not rigidly adhering to known reference levels for testing. The parameters of drivers vary with level. As such, ATC designs for those changes. Performance at 1W or 90dB SPL is relatively easy, but what happens at 100W or 110dB SPL? ATC knows and designs for it.

If you already have a good power amp, the SCM20PSL gives ATC’s world-class monitoring at half the cost of their equivalent active models. For more information, call or chat online with your Westlake Pro sales consultant today.

 

ATC SCM20PSL Pro specifications:

Drivers: LF 6.5″ (150mm) Super Linear; HF 1″/25mm dual-suspension ‘S-Spec’ tweeter
Amplitude linearity: 80Hz – 20kHz (+/-2dB)
Cut-off frequencies: 55Hz – 25kHz (-6dB freestanding)
Dispersion: +/-80° coherent horizontal, +/-10° coherent vertical
Maximum continuous SPL: 108dB (per pair @ 1m)
Crossover frequency: 2.1kHz
Recommended amplifier power: 75 to 300 watts
Nominal Impedance: 8 ohm
Connectors: 2 x pairs binding posts/4mm plugs – bi-wire-able
Cabinet dimensions (H x W x D): 17-11/16″ x 9-13/16″ x 11-19/32″ (450 x 250 x 294mm)
Weight: 39.7 lb. (18kg) (per cabinet)

 

Additional information

Weight 40 lbs
Dimensions 12 x 10 x 18 in

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