Technical Information

HR824 Block Diagram

 

 

+15VDC

POWER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODE

 

 

 

 

 

 

Vref

 

ON SWITCH

 

 

 

MUTE

 

 

AUTO

 

 

 

MUTE

 

 

 

 

ON/OFF

 

 

STANDBY

 

HIGH = MUTE OFF

 

 

 

 

 

 

LOW = MUTE ON

CONTROL

 

 

 

 

 

 

 

 

 

SIGNAL

 

THERMAL

 

 

 

 

 

 

SENSE

 

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW AC

 

 

 

 

PWR

 

 

 

VOLTS SENSE

 

 

 

 

LED

 

 

 

POWER SWITCH

 

 

 

 

 

 

 

(FRONT PANEL)

 

 

 

 

 

 

 

 

 

 

 

 

OVERLOAD

 

 

 

 

 

 

 

CLIP SENSE

LED

 

 

 

 

CLIP SENSE

 

 

 

 

 

 

 

CIRCUIT

 

 

 

 

 

 

 

 

 

UNBALANCED

 

 

 

 

HF OUT

 

HF TRANSDUCER

 

 

 

 

 

 

THERMAL MODELER

 

 

 

 

 

 

 

 

LINE

 

 

HIGH FREQ.

 

 

 

 

CROSSOVER

INPUT

 

 

 

 

 

 

 

 

 

+2 dB

 

 

 

 

2

 

 

 

 

 

 

1

 

 

0

 

 

COMPRESSOR

 

 

 

 

 

 

 

 

3

 

 

–2 dB

 

 

 

BALANCED

SENSITIVITY

 

 

 

 

 

 

 

 

 

 

 

 

LINE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INPUTS

 

SENSITIVE

 

 

 

 

LF TRANSDUCER

 

 

 

 

 

 

LF OUT

 

 

 

 

 

 

 

 

THERMAL MODELER

 

 

 

CALLOUS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ACOUSTIC

 

 

LOW FREQ

 

 

 

 

 

SPACE

 

 

37Hz (NORMAL)

 

 

 

WHOLE

 

 

 

 

 

 

HALF

 

 

 

47Hz

 

 

 

QUARTER

 

 

 

80Hz

 

OUTER SPACE

MOTION DETECTOR

FUSE

+

+

MID VDC

HI VDC

–

–

 

 

 

 

 

 

MACKIE DESIGNS

 

TOROIDAL POWER

+

 

HR824 THX

 

LO VDC

 

 

TRANSFORMER

 

BLOCK DIAGRAM

 

–

 

(#110200DF)

 

 

 

 

 

 

 

 

 

 

 

 

 

TO CLIP

SENSEHI-FREQUENCY

HI-FREQUENCY

DRIVER

HF OUT

POWER AMPLIFIER

 

HI-FREQ

TWEET

LO-FREQ

MUTE

TO CLIP

 

LO-FREQUENCY

SENSE

 

LO-FREQUENCY

LF OUT

DRIVER

POWER AMPLIFIER

 

 

 

 

 

WOOF

MUTE

BASS CONTROL SERVO LOOP

SENSE

RESISTOR

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 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-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.

16