Mackie HR824 MK2

Materials and Construction
3⁄4-inch (19 mm) thick MDF cabinet construction with internal bracing to add to cabinet stiffness, finished with Piano-black gloss finish. Die-cast aluminum exponential wave guide for controlled, wide
dispersion from high-frequency driver and Zero Edge Baffle™ to minimize diffraction around the cabinet edges.

Open cell adiabatic “foam fill” acoustical damping material absorbs internal reflections, preventing delayed sound coloration. Flush-mount connector system allows monitor to be placed against a wall without need for connector clearance.


Specifications Low-frequency driver
Diamter : 8.75 inches (222mm)
Sensitivity (2.83V, 1 m): 91 dB SPL
Nominal Impedance: 4 ohms
Voice Coil Diameter: 1.6 inches (40 mm)
Frame: Die-cast magnesium
Magnet: Ferrite
Fully shielded: Ferrite opposing magnet

Specifications High-frequency driver
Sensitivity (2.83V, 1m): 91 dB SPL
Nominal Impedance: 6 Ohms
Power Handling (Long Term/Program): 20/50 watts
Frequency Range: 1.6 kHz to 22 kHz
Diaphragm/Suspension: Titanium with polymer suspension
Voice Coil Diameter: 1.0 inch (25.4 mm)
Magnet: Neodymium
Bucking Magnet: Ferrite opposing magnet
Passive Radiator: 6-inch x 12-inch (152mm x 305mm)
 -  mass-loaded elliptical flat piston with variable thickness filleted edge rubber surround.


Crossover Type : Modified Linkwitz-Riley, 24 dB/octave @ 1900 Hz


Low-frequency power amplifier
Rated Power (at 1 kHz with 1% THD): 150 watts
Rated Load Impedance: 4 ohms
Burst Power Output: 350 watts
Rated THD (1W to –1 dB of rated power): 0.1 %
Slew Rate: 35V/μS
Distortion (THD, SMPTE IMD, DIM 100): < 0.035%
Signal-to-Noise: > 102 dB


High-frequency power amplifier
Rated Power(at 1 kHz with 1% THD): 100 watts
Rated Load Impedance: 6 ohms
Burst Power Output: 210 watts
Rated THD (1W to –1 dB of rated power): 0.1 %
Slew Rate: 35V/μS
Distortion (THD, SMPTE IMD, DIM 100): < 0.035%
Signal-to-Noise: > 102 dB


Inputs
Balanced Differential (XLR and 1/4" TRS)
Unbalanced (RCA)
Input Protection: RFI and Level Protected
Maximum Input Level: +20 dBu
Low Frequency Filter:
 –3 dB @ 37 Hz, 2nd-order transitional high-pass filter
 –3 dB @ 47 Hz, 4th-order Chebyshev high-pass filter
 –3 dB @ 80 Hz, 4th-order Butterworth high-pass filter
HF Equalization: ±2 dB @ 10 kHz, shelving


Compressor
Independent high and low frequency overload detection
Low Line Voltage Shut Down: 60% of Nominal Line
Thermal Protection: Amplifier Shut-Down, Auto Reset
Muting: 5 seconds at turn-on
Driver Protection: Independent LF and HF Detection and overall Compression