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TECHNICAL INFORMATION
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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
(20Hz-20kHz, unweighted, referenced to 150W into 4!):
> 102 dB
Cooling: Convection
Design: Class AB, Parametric Servo
Feedback
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
(20 Hz-20 kHz, unweighted, referenced to 100 W into 6 ohms):
> 102 dB
Cooling: Convection
Design: Conventional Class AB
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Input Type: Balanced Differential
(XLR and 1/4" TRS)
Unbalanced (RCA)
Input Impedance: 20 k! Balanced
10 k! Unbalanced
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
Acoustic Space:
A position: –4 dB @ 50 Hz, shelving
B position: –2 dB @ 50 Hz, shelving
C position: Flat
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
Overall Compression
HR824 MK2 Specifications
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Materials and Construction:
3⁄4-inch (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.
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Low-frequency driver:
Diameter: 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
High-frequency driver:
Sensitivity (2.83V, 1m): 91 dB SPL
Nominal Impedance: 6 !
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.
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Crossover Type:
Modified Linkwitz-Riley, 24 dB/octave @ 1900 Hz
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Free-Field Frequency Response:
±1.5 dB, 37 Hz to 20 kHz
Lower cutoff frequency: –3 dB @ 35 Hz
Upper cutoff frequency: –3 dB @ 22 kHz
Sound Pressure Level at 1 meter,
–7.5 dBu into balanced input: 100 dB SPL @ 1m
Maximum peak SPL per pair: 120 dB SPL @ 1m
Maximum short term SPL on axis,
half space 80 Hz to 2.5 kHz: 111 dB SPL @ 1m
Residual noise (maximum gain, 600! source,
20 Hz-20 kHz bandwidth): < 8 dB SPL @ 1m
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Power consumption:
Standby mode: 8 watts
Quiescent (idle): 18 watts
Musical Program, Loud mix: 135 watts
US: 120 VAC, 60 Hz
Europe: 240 VAC, 50 Hz
Korea: 220 VAC, 60 Hz
Japan: 100 V, 50-60 Hz
Rated Power
(For UL-6500, CSA-E65-94, EN-60065):
150 watts
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Height: 16.8 in/42.5 cm
Width: 10.8 in/27.3 cm
Depth Enclosure: 11.4 in/29.0 cm
Depth Overall: 13.8 in/35.1 cm
Weight: 34.6 lb/15.7 kg
LOUD Technologies is always striving to improve our products
by incorporating new and improved materials, components and
manufacturing methods. Therefore, we reserve the right to change
these specifications at any time without notice.
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11.4" (29.0 cm)
13.8" (35.1 cm)
16.8"
(42.5 cm)
HR824 MK2
WEIGHT
34.6 lb
(15.7 kg)
10.8" (27.3 cm)
HR824 Acoustic Space Filter Response
-15
+5
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
-0
+1
+2
+3
+4
dBu
10 20 50 100 200 500 1k 2k 5k 10k 20k
Hz
?
HR824 High Frequency EQ Filter Response
-15
+5
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
-0
+1
+2
+3
+4
dBu
10 20 50 100 200 500 1k 2k 5k 10k 20k
Hz
?
HR824 Low Frequency Filter Response
-45
+5
-43
-41
-39
-37
-35
-33
-31
-29
-27
-25
-23
-21
-19
-17
-15
-13
-11
-9
-7
-5
-3
-1
+1
+3
dBu
10 20 30 40 50 60 70 80 90 100 200
Hz
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+2 dB
2 0
3
1
–2 dB
HIGH FREQ.
CLIP SENSE
CLIP SENSE
CIRCUIT
HF TRANSDUCER
THERMAL MODELER
BALANCED
LINE
INPUTS
UNBALANCED
LINE
INPUT
SENSITIVITY
COMPRESSOR
CROSSOVER
HI-FREQ
WHOLE
HALF
QUARTER
ACOUSTIC
SPACE
LO-FREQ
SENSITIVE
CALLOUS
HF OUT
LF TRANSDUCER
LF OUT THERMAL MODELER
TO CLIP
SENSE
HI-FREQUENCY
POWER AMPLIFIER
HI-FREQUENCY
DRIVER
LO-FREQUENCY
DRIVER
TWEET
HF OUT
LF OUT
MUTE
37Hz (NORMAL)
80Hz
LOW FREQ
47Hz
TO CLIP
SENSE
LO-FREQUENCY
POWER AMPLIFIER
MUTE
SENSE
RESISTOR
BASS CONTROL SERVO LOOP
MOTION DETECTOR
WOOF
+
–
MID VDC
+
–
LO VDC
+
–
HI VDC
TOROIDAL POWER
TRANSFORMER
FUSE
Vref
ON
AUTO
STANDBY
+15VDC
SIGNAL
SENSE
MUTE
ON/OFF
CONTROL
MUTE
THERMAL
SWITCH
LOW AC
VOLTS SENSE
POWER SWITCH
(FRONT PANEL)
POWER
MODE
SWITCH
POWER RING
(POWER = WHITE
OVERLOAD = RED)
HIGH = MUTE OFF
LOW = MUTE ON
MACKIE
HR824 MK2
BLOCK DIAGRAM
(030207)
OUTER SPACE
The following are trademarks or registered trademarks
of LOUD Technologies Inc.: The Mackie logo, HR
Series, Zero Edge Baffle, and the Running Man.
THX and pm3 are trademarks of THX Ltd. which may
be registered in some jurisdications. All rights reserved.
Lucasfilm is a trademark of Lucasfilm Ltd.
This manual also contains names and marks of other
companies which belong to those respective companies,
and are hereby acknowledged.
HR824 MK2 design protected under the following patent:
DES. 387,351
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©2007 LOUD Technologies Inc. All Rights Reserved.