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ATC SCM25A Pro Nearfield Monitor

ATC have announced that their new SCM25A Pro active nearfield monitors, first displayed at the AES convention in New York.  The SCM25As feature three of ATC's proprietary soft-dome drivers, comprising a one-inch tweeter, a three-inch mid-range driver and a seven-inch woofer. The drive units are powered by three Class-AB MOSFET amplifiers (25W, 60W and 150W for the HF, MF and LF drivers, respectively), and the drivers are integrated with fourth-order crossovers set at 380Hz and 3.5kHz.

Interestingly, ATC say that the idea behind their implementation of a ported cabinet design differs from most other manufacturers' in that, while the port does increase the speakers' bass extension, this was not their primary aim. Rather, the port helps to correctly load the bass driver, which increases excursion linearity and reduces distortion.

If you prefer the improved time-domain response of a sealed cabinet, however, ATC provide foam port bungs with the speakers, which apparently attenuates the speakers' response by 1.5dB around 80Hz, but  increases the output below 45Hz by roughly 1dB, bringing the overall frequency response closer to what you'd expect from an infinite-baffle design.

The SCM25As are well suited to broadcast applications and smaller control rooms, where some of the larger ATC monitors might not be appropriate. Accordingly, the dispersion is very tightly controlled, with a nominal 80 degrees horizontally and 10 degrees along the vertical axis, which ATC say makes for a wide sweet spot and an optimum balance of direct to reverberant sound.

See Billy Woodham talk about the New SCM25A

 

Features

• 25mm soft dome tweeter.
• ATC hand built 2"/75mm soft dome mid driver
• ATC hand built 7"/175mm carbon-paper cone bass driver
• On board 235W class A/B three channel amplifier
• Compact size with high output and low cut-off frequency
• 19" rack mountable
• 6 year warranty.

Specifications

Drivers :
HF 25mm soft dome, Mid 75mm soft dome, LF 175mm short-coil carbon paper cone
Amplitude Linearity (±2dB) :
74Hz-17kHz
Cut-off Frequencies (-6dB, free-standing) :
47Hz-22kHz
Horizontal Dispersion :
±80°, Coherent
Vertical Dispersion :
±10°, Coherent
Max. Continuous SPL (1 metre) :
109dB
Audio Input :
rear panel mounted female xlr (pin 2 +)
Input Sensitivity
1V rms (ref. full output)
Input Sensitivity Trim :
0dB to -6dB (continuously variable via rear panel trimmer)
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 compensation
Low Frequency Boost :
0dB to +6dB at 40Hz (continuously variable via rear panel trimmer)
Overload Protection :
Active FET momentary gain reduction
Mains Power Requirements :
115/230V, 50/60Hz via rear panel switch, 100v 50/60Hz factory set
Mains Power Consumption :
56VA (standby max) 154VA (typical 1/8th power) 375VA (max)
Thermal Output :
53W (idle) 130W (1/8th power)
Dimensions (HxWxD) :
264 x 430 x 408mm
Weight :
30kg / 66lbs (per cabinet)

For more information on this or any other product please contact us at: sales(at)tagnz.co.nz or PH: +64 (0)9 416 0190

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