HR824
Active 2-Way Studio Monitor
SPEAKER
HR824
Features
Flat frequency response (±1.5 dB, 39 Hz to 20 kHz)
1" ferro-fluid cooled aluminum alloy dome tweeter
8.75" mineral-filled polypropylene cone woofer
Proprietary, acoustically non-resonant high-frequency
exponential waveguide
6" x 12" elliptical passive radiator for enhanced
bass performance
100 watt HF and 150 watt LF FR Series power amplifiers
Servo-loop architecture for improved low-frequency
overload detection
Independent high and low frequency overload detection
High-strength cabinet constructed with 3/4" 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 power switch with indicating LED
Front panel overload indicating LED
HR Series
The HR824 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 8.75-inch die-
cast magnesium frame low-frequency transducer, and a
6-inch x 12-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 39 Hz.
The FR Series™ amplifiers found in the HR824 cabinet
are an example of application-specific amplifier design
that can be exercised when designing active speaker sys-
tems. The low-frequency amplifier is rated at 150 watts
rms continuous output, and the high-frequency amplifier is
rated at 100 watts rms continuous.
The input panel on the back accepts a line-level input
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 con-
trol to trim the gain from input to output and adjust for vari-
ous 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 37 Hz, 47 Hz, and 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 3/4-inch (19 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.
R E L A T E D P R O D U C T S
HR624 Active 2-Way Studio Monitor, HR626 Active 2-Way
Studio Monitor, HRS120 Active Subwoofer, HRS150 Active
Subwoofer
Applications
Near-field studio monitors
Home Theater surround sound
