A monitor is not just a simple loudspeaker. Much higher demands are made on a monitor...
It should reproduce the performance of a musician as a reliable control, often in a very loud environment, with a high feedback limit.
With this guideline, chief development engineer Claudio Ottani has made the M 12-4 into a high level affair, developed more on the stage than at the work bench, he has developed an unusual top-class active monitor in collaboration with many musicians and sound engineers.
The acoustic requirements can only be achieved by perfect sound control and the highest quality of components, so only a Bi-Amp operated active concept was worth considering. The active separation enables a clean linear frequency response and thus a very high feedback limit.The two integral output stages in class H technology provide 225 W/RMS to the 12" 18Sound woofer and 50 W/RMS to the B&C 1" pressure compression driver, which has a pivoting 90° x 60° horn. In this way, a maximum sound pressure of 128 dB SPL is achieved.
To optimize the highest backward attenuation on microphones with cardioid or hypercardioid characteristics, the two loudspeakers are arranged one over the other, making perfect positioning possible.
 

The stand mount plus 3 M10 flying points, integrated in the extremely compact housing expands the range of use and makes the M 12-4 into a versatile public address system with many possibilities for use.
The input sensitivity is reversible between microphone and line level. A balanced XLR parallel out is available for looping through the input signal. The integral dynamic soft clip limiter protects the system from overload and enables reliable operation right up to the power limit.
 
STAGE OPERA M 12-4
• 2 way bi-amplified active monitor
• 12" Eighteen-Sound Woofer
• 1" B&C Compr. 90°x60°, adjustable
• 225 + 50 Watt/RMS, 550 Watt/PRG
• 70 – 18000 Hz
• Max. SPL: 126 dB
• Housing made of 20mm black lacquered multiplex
• Two set-up angels, 45° & 60°
• Standmount
• Weight: only 19kg/ 42 lbs
• Very compact design