Mackie HR824mk2 Studio Monitor (2010)

Acoustic Section
Free-field Frequency Response: &plsumn;1.5dB, 37Hz to 20kHz
Lower cutoff frequency: -3dB @ 35Hz
Upper cutoff frequency: -3dB @ 22kHz
Sound Pressure Level at 1 meter, -7.5dBu into balanced input: 100dB SPL @ 1m
Maximum peak SPL per pair: 120dB SPL @ 1m
Maximum short term SPL on axis, half space 80Hz to 2.5kHz: 111dB SPL @ 1m
Residual noise (maximum gain, 600? source, 20Hz-20kHz bandwidth): < 8dB SPL @ 1m
Rated Line Input Voltage and Power:
(Power consumption):
Standby mode: 8W
Quiescent (idle): 18W
Musical Program, Loud mix: 135W
US: 120 VAC, 60Hz
Rated Power (For UL-6500, CSA-E65-94, EN-60065): 150W
Amplifier Section
(Low-frequency power amplifier)
Rated Power (at 1kHz with 1% THD): 150W
Rated Load Impedance: 4 ohms
Burst Power Output: 350W
Rated THD (1W to -1dB of rated power): 0.1 %
Slew Rate: 35V/S
Distortion (THD, SMPTE IMD, DIM 100): <0.035%
Signal-to-Noise
(20Hz-20kHz, unweighted, referenced to 150W into 4 ohm): > 102dB
Cooling: Convection
Design: Class AB, Parametric Servo Feedback
(High-frequency power amplifier)
Rated Power(at 1kHz with 1% THD): 100W
Rated Load Impedance: 6 ohms
Rated THD (1W to -1dB of rated power): 0.1 %
Burst Power Output: 210W
Slew Rate: 35V/S
Distortion (THD, SMPTE IMD, DIM 100): < 0.035%
Signal-to-Noise (20Hz–20kHz, unweighted, referenced to 40W into 8 ohm): > 102dB
Cooling: Convection
Design: Monolithic IC, Conventional Class AB
System Specifications
Input Type: Balanced Differential (XLR and 1/4" TRS), Unbalanced (RCA)
Input Impedance: 20 kohm Balanced, 10 kohm Unbalanced
Input Protection: Rfi and Level Protected
Maximum Input Level: +20dBu
Low Frequency filter: -3dB @ 37Hz, 2nd-order transitional high-pass filter, -3dB @ 47Hz, 4th-order Chebyshev high-pass filter, -3dB @ 80Hz, 4th-order Butterworth high-pass filter
HF Equalization: ±2dB @ 10kHz, shelving
Acoustic Space: (A position) -4dB @ 50Hz, shelving, (B position) -2dB @ 50Hz, shelving, (C position) flat
(Compressor)
Independent high and low-frequency overload detection
Enclosure Alignment: 6th Order
Over Excursion Prevention: 2nd Order High-Pass filter
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, Overall Compression
Transducers
Low-frequency driver:
Diameter: 8.75" (170 mm)
Sensitivity (2.83V, 1m): 91dB SPL
Nominal Impedance: 4 ohm
Voice Coil Diameter: 1.6" (40 mm)
Frame: Die-cast magnesium
Magnet: Ferrite
Fully shielded: Ferrite opposing magnet
High-frequency driver: Sensitivity (2.83V, 1m): 91dB SPL
Nominal Impedance: 6 ohm
Power Handling (Long Term/Program): 20W/50W
Frequency Range: 1.6kHz to 22kHz
Diaphragm/Suspension: Titanium with polymer suspension
Voice Coil Diameter: 1.0" (25.4 mm)
Magnet: Neodymium
Bucking Magnet: Ferrite opposing magnet
Passive Radiator: 6" x 9" (152 mm x 228 mm) mass-loaded elliptical flat
piston with variable thickness filleted-edge rubber surround
Crossover Type: Modified Linkwitz-Riley, 24dB/octave @ 1,900Hz
Enclosure
Materials and Construction:
3/4" (19 mm) thick MDF cabinet construction with internal bracing to add to cabinet stiffness
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
Physical Properties
Height: 16.8"/42.5 cm
Width: 10.8"/27.3 cm
Depth Enclosure: 11.4"/29 cm
Depth Overall: 13.8"/35.1c m
Weight: 34.6 lb./15.7 kg