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.
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.
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 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.
HR824 Active 2-Way Studio Monitor, HR626 Active 2-Way Studio Monitor, HRS120 Active Subwoofer, HRS150 Active Subwoofer
Active 2-Way Studio Monitor
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
Proprietary, acoustically non-resonant high-frequency exponential waveguide
6" x 9" elliptical passive radiator for enhanced bass performance
40 watt HF and 100 watt LF power amplifiers
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
Near-field studio monitors
Home Theater surround sound