Mackie HR624mk2

We began producing the original HR624 Studio Monitors in 2001, the baby brother to our flagship HR824 Studio Monitors. The HR624 MK2s have been redesigned with modern components for improved ac- curacy and an extended low-frequency response. When we decided it was time to update the HR624s, we turned to our expert loudspeaker and transducer de- sign engineering team at EAW to determine how to make an already excellent studio monitor even better. The first thing they noticed was that the front baffle could be redesigned with a rounder aluminum construction to further reduce edge diffraction for improved imag- ing. The volume of the cabinet was increased slightly to improve the low-frequency response. The amplifiers have been adjusted with all new ‘voicing’ to match the new cabinets. However, the amplifiers’ design is fundamental- ly the same and has a very similar characteristic to the original model. If you are upgrading from the original HR624s, you won’t have to relearn the sound. The MK2s still deliver the clarity, ultra-linear frequency response, and broad stereo imaging of the originals.

An elegant piano-black gloss finish emphasizes that these studio monitors are in a class by themselves, pleasing to the most discerning eye as well as the most discerning ear.

The result? The HR624 MK2 Studio Monitors are extremely accurate and versatile, loaded with unique con- trols that allow you to fine-tune the sound to match your individual environment precisely. You’re gonna love these!

What are they? The Advantages...

The HR624 MK2 Studio Monitors are high-resolution, two-way, bi-amplified, active monitors employ- ing a 6th-order Butterworth system with a built-in rear-firing mass-loaded passive radia- tor. Whew! There are many benefits to integrating an active crossover, power amplifiers, and drivers into a single cabinet, and we’ve taken full advantage of these benefits in the design of the HR624 MK2.

• The crossover point is designed so that the high- and low-frequency drivers are fed only the frequencies they are best able to reproduce.
• The amplifiers are designed to provide maximum acoustic output from the speakers, yet minimize the danger of speaker damage due to overdriving.
• In addition, the amplifiers’ gain and frequency re- sponses are individually hand-trimmed to compen- sate for typical manufacturing tolerances between the drivers and produce a smooth frequency response from 45 Hz to 20 kHz.
• The connecting wires between the amplifier outputs and the drivers are kept to an absolute minimum, so the damping factor of the amplifier isn’t compro- mised by the resistance of long speaker cables.
• The acoustic sum of the outputs from the two driv- ers are optimized electronically, as well as physi- cally, so the amplitude response is unity and the phase difference is minimal.

In short, all the complex interconnected components in the system are designed to work in harmony with each other to produce the best possible sound.

The Transducers...

The monitors feature a 6.7-inch high-precision, low- distortion woofer and a 1-inch ferrofluid cooled titanium dome tweeter on the front, and a 6-inch x 9-inch ellipti- cal flat piston passive radiator in the back.

The high-frequency driver is mounted on a massive, acoustically non-resonant die-cast aluminum expo- nential waveguide, which results in wide, controlled dispersion of high-frequency sounds. The unique pas- sive radiator design provides a smooth response down to 45 Hz — an astounding accomplishment for a cabinet of this size! And since the radiator is producing most of the sound at the lowest frequencies, there is very little distortion from the woofer because its cone movement is minimal at those frequencies.

The Cabinet...

The cabinet is made of MDF with a high-gloss piano- black finish. Internal bracing increases the strength and rigidity (stiffness) of the box. An open-cell adiabatic foam material fills the inside of the box to absorb internal reflections and dampen standing waves. Mounting hardware is installed on the bottom of the cabinet that fits the WB-60 OmniMount wall-mount bracket.

Power Amplifiers...

The low-frequency amplifier produces up to 100 watts continuous before clipping, while the high-frequency amplifier produces up to 40 watts continuous.

Placement

The HR624 MK2s were designed to be placed in a vertical position. If you find it necessary to place the speakers in a horizontal position (on their sides), place them so that the woofers are toward the inside; that is, so the woofers are closest to each other. This provides the best low-frequency summing and overall imaging.

The HR624 MK2s may also be wall-mounted using the mounting hardware located on the bottom of the cabinet. These are currently designed to be used with the OmniMount 60.0 WB (Wall-to-Bottom) wall-mount bracket, which provides a wide range of horizontal and vertical movement to meet your coverage requirements. However, many companies change specifications without notice.