Mackie Speaker HR624 User Manual

HR624  
Active 2-Way Studio Monitor  
HR Series  
The HR624 studio monitors are high-resolution, two-  
way, bi-amplified, active monitors employing a 6th-order  
Butterworth system with a built-in rear-firing mass-loaded  
passive radiator. They feature a 1-inch aluminum-alloy  
high-frequency transducer, a high-precision 6.7-inch die-  
cast magnesium frame low-frequency transducer, and a  
6-inch x 9-inch elliptical flat piston passive radiator in the  
back. The system is composed of a single, compact cabinet  
with built-in control and amplifier electronics.  
The high-frequency driver is mounted on a massive,  
acoustically non-resonant die-cast zinc exponential  
waveguide, which results in wide, controlled dispersion  
for high-frequency sounds. The unique passive radiator  
design provides smooth response down to 52 Hz.  
Features  
Flat frequency response (±1.5 dB, 52 Hz to 20 kHz)  
1" ferro-fluid cooled aluminum alloy dome tweeter  
6.7" mineral-filled polypropylene cone woofer  
The amplifiers found in the HR624 cabinet are an  
example of application-specific amplifier design that can  
be exercised when designing active speaker systems. The  
low-frequency amplifier is rated at 100 watts rms continu-  
ous output, and the high-frequency amplifier is rated at  
40 watts rms continuous.  
Proprietary, acoustically non-resonant high-frequency  
exponential waveguide  
6" x 9" elliptical passive radiator for enhanced bass  
performance  
The input panel on the back accepts a line-level input  
40 watt HF and 100 watt LF power amplifiers  
with balanced 1/4" TRS, XLR, and unbalanced RCA connec-  
tors. The connectors face downward so the monitor can be  
placed flush against a wall. There is an input sensitivity  
control to trim the gain from input to output and adjust for  
various input levels. An acoustic space switch adjusts the  
bass response to compensate for corner (quarter space) or  
wall (half space) placement. A low-frequency switch selects  
a high-pass cutoff frequency of 80 Hz, and a high-frequency  
switch provides either 2 dB of boost or cut above 10 kHz.  
The power mode switch can be used to turn the monitor on  
and off, a function that is duplicated with the front panel  
switch, or to put the monitor into auto mode, where the  
amplifiers revert to standby when no signal is present for  
several minutes. The instant a signal appears at the input, the  
amplifiers seamlessly come back to life and produce sound.  
The cabinet is constructed using 5/8-inch (16 mm)  
thick MDF with a 1-inch (25 mm) thick MDF front panel. An  
internal H-brace provides additional cabinet stiffness, and  
open cell adiabatic "foam fill" acoustic damping material  
absorbs internal reflections.  
Servo-loop architecture for improved low-frequency  
overload detection  
Independent high and low frequency overload detection  
High-strength cabinet constructed with 5/8" MDF  
composite and 1" front board with radiused edges  
Internal H-brace for extra rigidity  
High-density adiabatic foam absorbs internal reflections  
Full magnetic shielding  
Balanced XLR and 1/4" TRS, and unbalanced RCA  
input connectors, downward facing  
Modified Linkwitz-Riley 24 dB/octave crossover  
Recessed adjustable sensitivity control  
Acoustic Space switch for selecting whole space,  
half space, or quarter space placement  
Low-Frequency switch for bandwidth limiting the  
low-frequency response  
High-Frequency switch boosts or cuts high frequencies  
Power Mode switch includes AUTO mode  
Front panel mute switch with indicating LED  
Front panel overload indicating LED  
Applications  
R E L A T E D P R O D U C T S  
HR824 Active 2-Way Studio Monitor, HR626 Active 2-Way  
Studio Monitor, HRS120 Active Subwoofer, HRS150 Active  
Subwoofer  
Near-field studio monitors  
Home Theater surround sound  
 

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