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Mackie HR824
Technical Description
Enclosure Materials and Construction
3/4" (19mm) thick MDF construction with 1" (25.4mm) thick MDF front panel with radiused edges to minimize diffraction.
Proprietary exponential wave guide for controlled, wide dispersion from high-frequency driver.
Internal "H" brace adds to cabinet stiffness.
Open cell adiabatic "foam fill" acoustic 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.
Transducers
Low-frequency driver 8.75" (222mm) die-cast magnesium frame, mineral-filled polypropylene cone, oversized magnet structure, and over 16mm cone excursion.
High-frequency driver 1" (25.4mm) viscous edge-damped aluminum dome with ferrofluid-cooled voice coil.
Passive Radiator 6 x 12 in. (152 x 305mm) elliptical flat cone composed of aluminum honeycomb/phenolic with variable thickness filleted edge neoprene surround, mass-loaded, acoustic insulated.
Crossover Section
Crossover Type: Modified Linkwitz-Riley, 24 dB/octave @ 1800Hz
Sensitivity: 0 dBu nominal
Input Impedance: 20k ohm, balanced bridging
Compressor: Independent high and low frequency overload detection
Equalization
Acoustic Space Equalization (at 500Hz):
A = -4dB
B = -2dB
C = flat
Roll Off EQ: -3 dB @ 50Hz or 80Hz, 12dB/octave Multiple Feedback High Pass filter
High Freq. EQ: ± 2 dB @ 10kHz, shelving
Acoustic Section
Free Field Frequency Response: ±1.5 dB, 39Hz to 22kHz
Lower cutoff frequency: -3 dB @ 38Hz
Upper cutoff frequency: -3 dB @ 22.5kHz
Sound Pressure Level at 1 meter, -7.5dBu into balanced input 100dB SPL @ 1m
Maximum peak SPL per pair 121dB SPL @ 1m
Maximum short term SPL on axis, half space 80Hz to 2.5kHz 111 dB SPL @ 1m
Residual noise (maximum gain, 600 ohms source, 20Hz-20kHz bandwidth) < 8dB SPL @ 1m
Mackie HR624
Technical Description
Acoustic Performance
Free Field Frequency Response: 52Hz š 20Hz ±1.5dB
Low Frequency Response: š3dB at 49Hz
High Frequency Response: š3dB at 22kHz
Sound Pressure Level @1 meter, 7.5dBu Into Balanced Input: 100db SPL@1m
Max output per pair: 112dB @ 1m
Transducers
Low Frequency: 6.7 in. (170mm) with die-cast magnesium frame, mineral-filled polypropylene cone
High Frequency: 1 in. (25mm) viscous edge-damped aluminum dome with ferro fluid-cooled voice coil
Passive: 6 x 9 in. (152 x 128mm) elliptical flat piston with variable-thickness filleted rubber surround
Amplifier
Low Frequency Power: 100 watts, 4-Ohm load
High Frequency Power: 40 watts, 6-Ohm load
Slew Rate: >15V/µs
Distortion THD/SMPTE/IMD/DIM100: <0.035%
Type: FR Series Class AB
Electronic Crossover
Crossover Type: Modified Linkwitz-Riley 24dB/octave
Crossover Point: 3000Hz
Input Impedance: 20kOhm, balanced bridging
Compressor: Independent HF and LF overload protection
Construction
Enclosure: Ó in. (19mm) MDF with 1 in. (25mm) MDF front panel, internal H bracing
Damping: Adibiatic foam
Waveguide: Cast zinc
Equalization
Acoustic Space: EQ flat/-2dB/-4dB @ 400Hz
High Frequency: EQ flat/+2dB @ 10kHz
LF Roll-off: EQ flat/80Hz (Butterworth 2nd-order filter per THX¬ spec) |
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