- Worldwide standard high-resolution professional studio monitor with true Active design 6.7 (170mm) high-precision, extended LF transducer; elliptical, rear-firing, mass-loaded, passive radiator for extended bass performance1 (24.5mm) waveguide-loaded HF transducer with viscous, edge-damped aluminum dome and ferrofluid-cooled voice coilTrue Active design with FR Series amplifiers"”100W LF / 40W HF with onboard time- and phase-correction crossover Acoustic Space, LF roll-off and HF adjustment controls for use in matching the acoustic properties of any room Î+/- 1.5 dB 51Hz-20kHz response guaranteed by calibration"”includes individual, signed Calibration Certificate XLR, 1/4 and RCA inputs 115 dB SPL @ 1m per pair Full internal damping eliminates unwanted midrange artifacts Non-fatiguing through hours of use THX pm3 approved for 5.1 and 7.1 surround mixing and playback
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 continuous 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 connectors. 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.