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M3D
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Line Array Meyer Sound Laboratories Inc
APPENDIX A - M3D LINE ARRAY SPECIFICATIONS
Table 2. M3D Line Array Specifications
Acoustical
Note: The low-frequency power response of the system will increase according to the length and configuration of the array
Operating frequency range 35 Hz to 16 kHz
Free field ±4 dB 42 Hz - 16 kHz; -6 dB @ 35 Hz and 16 kHz
Note: Measured with 1/3 octave frequency resolution in fixed ISO bands at 4 meters.
Phase response ±30˚ 300 Hz - 14 kHz
Maximum peak SPL 145 dB
Note: Measured with 1/3 octave frequency resolution in fixed ISO bands at 4 meters.
Dynamic range > 110 dB
Horizontal coverage Low frequency: Cardioid, with active pattern control
High frequency: 90˚
Note: MAPP Online data available
Vertical coverage Vertical coverage varies, depending on array length and configuration.
Acoustical crossover 580 Hz
Note: At this frequency, the high- and low-frequency transducers produce equal sound pressure levels.
Transducers
Low/mid frequency (front) 2 each 15-inch diameter cone drivers with Neodynium Magnets
Nominal impedance: 4 ohms
Voice coil size: 4 inches
Power-handling capability: 1200 W
Note: Power handling is measured under AES standard conditions: transducer driven continuously for two
hours with a band-limited noise signal (125 Hz to 8 kHz) having a 6 dB peak-to-average ratio.
Note: To eliminate interference at short wavelengths, the two front-facing 15-inch drivers work in combination at low frequencies (35
Hz to 140 Hz). At mid frequencies (140 Hz to 580 Hz) only one driver is fed from the crossover to maintain optimal polar and frequency
response characteristics.
Low/mid frequency (rear) 2 each 15-inch diameter cone drivers
Nominal impedance: 8 ohms
Coil size: 3 inches
Power-handling capability: 600 W
Note: AES transducer rating wattage; loudspeakers driven with a band-limiting noise signal (125 Hz to 8
kHz) with 6-dB peak-to-average ratio for two hours.
Note: At low/mid frequencies the two rear-facing 15-inch drivers produce a wave front that interacts with, and is additive to, the wave
front produced by the two front-facing drivers, while reducing sonic energy directed from the rear of the cabinet. The resultant
directional low-frequency output extends to 35 Hz, with a 25 dB reduction in SPL behind the cabinet.
High frequency Two 4 inch diaphragm compression drivers coupled to a constant-directivity horn through a proprietary
acoustical combining manifold
Nominal impedance: 8 ohms
Voice coil size: 4 inches
Diaphragm size: 4 inches
Throat size: 1.5 inches
Power-handling capability: 200 W
Note: AES transducer rating wattage; loudspeakers driven with a band-limiting noise signal (125 Hz to 8
kHz) with 6-dB peak-to-average ratio for two hours.