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16
+2 dB
0
2
3
1
–2 dB
HIGH FREQ.
CLIP SENSE
OVERLOAD
LED
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
THERMAL MODELER
LF OUT
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
V
ref
ON
AUTO
STANDBY
+15VDC
SIGNAL
SENSE
MUTE
ON/OFF
CONTROL
MUTE
THERMAL
SWITCH
LOW AC
VOLTS SENSE
POWER SWITCH
(FRONT PANEL)
POWER
MODE
SWITCH
PWR
LED
HIGH = MUTE OFF
LOW = MUTE ON
MACKIE DESIGNS
HR824 THX
BLOCK DIAGRAM
(#110200DF)
OUTER SPACE
Technical Information
HR824 Block Diagram
Specifications
Enclosure
Materials and Construction:
3
⁄
4
-inch (19mm) thick MDF construction with 1-inch
(25.4mm) thick MDF front panel with radiused edges to
minimize diffraction.
Proprietary die-cast zinc exponential wave guide for
controlled, wide dispersion from high-frequency driver.
Internal “H” brace adds to cabinet stiffness.
Open cell adiabatic “foam fill” acoustical damping mate-
rial 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-inch (222mm) die-cast magnesium frame, mineral-
filled polypropylene cone, oversized magnet structure,
and over 16mm cone excursion.
High-frequency driver:
1-inch (25.4mm) viscous edge-damped aluminum-alloy
dome with ferrofluid-cooled voice coil.
Passive Radiator:
6-inch x 12-inch (152mm x 305mm) mass-loaded
elliptical flat piston composed of aluminum honeycomb
composite with variable thickness filleted edge rubber
surround.