Meyer Sound Laboratories Inc M3D
™
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APPENDIX B - M3D-SUB DIRECTIONAL SUBWOOFER SPECIFICATIONS
Table 3. M3D-Sub Directional Subwoofer
Acoustical
Operating frequency range ±4dB 30 Hz - 88 Hz
-6 dB at 29 Hz and 95 Hz
Phase response ±30˚ Hz - 95 Hz; + 90˚ at 30 Hz
Maximum peak SPL >140 dB at 1 meter
Horizontal coverage Cardioid response pattern
Transducers
Low frequency Two each 18 inch diameter cone drivers
Nominal impedance: 4 ohms Voice coil size: 4 inches
Power-handling capability: 1200 W
Two 15" cone drivers
Nominal impedance: 8 ohms
Coil size: 3 inches
Power-handling capability: 600 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.
Audio Input
Type Differential, Electronic balanced”
Maximum common mode
range
±15 VDC, clamped to earth for voltage transient protection
Connectors Female XLR input with male XLR loop output
Input impedance 10k ohms differential between pins 2 and 3
Wiring Pin 1: Chassis/earth through 220k ohm, 1000 pF, 15 V clamp network to provide virtual ground lift at audio
frequencies
Pin 2: Signal +
Pin 3: Signal -
Case: Earth ground and chassis
CMRR > 50 dB, typically 80 dB (50 Hz–500 Hz)
RF filter Common mode: 425k Hz
Differential mode: 142 kHz
TIM filter < 80 kHz (integral to signal processing)
Input level Audio source must be capable of producing a minimum of 20 dBV (10 Vrms, 14 V pk) into 600 ohms in
order to produce maximum peak SPL over the operating bandwidth of the speaker.
Nominal input sensitivity 0 dBV (1 Vrms, 1.4 pk) continuous average is typically the onset of TPL limiting for noise and music.
Amplifiers
Amplifier type Complementary power MOSFET output stages (class AB/H) based on 95 Vpk into 4 ohms
Output power 4500 watts (1125 watts/channel, four channels)
Note: Amplifier wattage rating is based on the maximum unclipped burst sine-wave RMS voltage the
amplifier will produce into the nominal load impedance; in this case, 67 Vrms (95 V pk) into 4 ohms.
THD, IM TIM < .02%
Load capacity 4 ohms minimum impedance each channel
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