ATC SCM-10a-2

 The following online review gives a good summary of the speakers. 

"The ATC SCM10A-2 is a two-way design that incorporates a 5” mid/bass driver and a 1” soft dome tweeter. The speaker’s dimensions are 11.5” high by 9” wide by 12.25” deep. The enclosure has a front to back tapered shape and is composed of a special gray finished laminate material. The speaker grill is made of black perforated metal. The back of the speaker is an aluminum extrusion which acts as a heatsink for the power amplifiers output stage transistors. The structure is very rigid, non-resonant, and visually attractive. Internally, the SCM10A-2 features the ATC proprietary twin channel power amplifier with the Grounded Source output stage and the electronic crossover. The crossover is a fourth-order Linkwitz-Riley which provides a crossover frequency of 2.8 kHz and time (phase) alignment. Frequencies above the crossover frequency are sent to the 50 watt class A power amplifier that drives the tweeter and frequencies below are sent to the 200 watt class AB amplifier which drives the mid/woofer. The mid/woofer is awesome. I have never seen a 5” driver with such a massive motor structure. This accounts for the low distortion high output of the SCM10A-2. 

SCM10A-2 speakers

Drivers: Tweeter – 25mm (1”), Mid/Bass – 125mm (5”)
Cut-off Frequencies (-6dB free standing): 45Hz & 22kHz
Amplitude Linearity ±2db: 70Hz - 17kHz
Matched Response: ±0.5dB
Dispersion: Horizontal - ±80° Coherent, Vertical - ±10° Coherent
Max. continuous SPL (@ 1 meter): 105dB
Crossover Frequency: 2.8kHz via active crossover with time (phase) alignment
Input Connector: Male XLR
Input Sensitivity: 1V
Input Impedance: >10k ohms balanced XLR
Amplifier Output: HF – 50 watts rms, Mid/LF 200 watts rms
Overload Protection: Active Momentary Gain Reduction (both amplifiers)
Power Requirements: Voltage - 110, 115, 230 (factory set), Frequency – 50/60Hz, Power - Nominal 50 watts, driven 250 watts
Cabinet Dimensions (HxWxD): 290 x 230 x 310mm
Overall Weight: 15.5kg (34lb)