Mackie HR624mk2 6-Inch 140W 2-Way Powered Studio Reference Monitor

Mackie HR624mk2: A Compact Reference That Tells the Truth

The Mackie HR624mk2 is a 6-inch two-way powered studio reference monitor built around 140 watts of bi-amplification, a magnesium-cone woofer, and a titanium-dome tweeter for accurate nearfield mixing. Sold individually so you can build a stereo pair or a full surround array, it packs THX pm3-certified performance into a cabinet compact enough for a project room. For the mixer chasing decisions that hold up everywhere, it is the reference that stops the second-guessing.

Two Amplifiers, Two Jobs

Rather than split one amplifier across both drivers, the HR624mk2 dedicates a 100-watt Class-AB amplifier to the woofer and a separate 40-watt amplifier to the tweeter. Active bi-amplification means the crossover happens at line level ahead of the amplifiers, so each driver is fed exactly the band it handles best and neither robs power from the other during loud passages. The result is 140 watts of headroom that stays clean when a mix peaks, not a shared supply that sags.

Drivers Chosen for Accuracy

The 6.7-inch woofer uses a magnesium cone, a stiff, light material that resists the flexing that muddies midrange in softer cones, keeping vocals and instruments precisely placed. Above it, a 1-inch titanium dome tweeter, cooled by ferrofluid to handle sustained level, extends smooth response to 20 kHz. A modified Linkwitz-Riley crossover at 3 kHz hands off between them with a 24 dB-per-octave slope, so the transition stays phase-coherent and free of the ragged dip that plagues lesser designs.

Real Low End Without a Port

Instead of a tuned port, the HR624mk2 loads its cabinet with an elliptical mass-loaded passive radiator that extends usable response down to 49 Hz within plus or minus 1.5 dB. A passive radiator moves like a woofer but has no cone to drive, so it delivers extended bass without the wind noise and one-note resonance that ports can add. That gives a 6-inch monitor low-frequency reach and definition normally reserved for larger boxes, so kick and bass sit where they belong.

Tuned to Your Room

No monitor performs in a vacuum, and the HR624mk2 gives you the tools to correct for placement. A three-position Acoustic Space switch trims low-frequency buildup when the monitor sits against a wall or into a corner, while additional low-frequency roll-off and high-frequency trim controls fine-tune the balance to your space. The Zero Edge Diffraction baffle rounds the cabinet edges around the tweeter, widening the sweet spot and sharpening the stereo image so small moves in the mix stay audible.

Connect to Anything

Balanced XLR and 1/4-inch TRS inputs handle professional interfaces and consoles, while an unbalanced RCA input accepts consumer sources, all with generous headroom up to +20 dBu. Use only one input at a time and the monitor drops straight into any signal chain, from a compact desktop interface to a large-format console.

Who the HR624mk2 Is For

Project and professional studios reach for it as an accurate nearfield for mixing and tracking; post houses run it in stereo or multichannel arrays for film, television, and game audio under its THX pm3 certification; broadcast and voiceover rooms trust its low coloration for spoken-word work. If your room is tight but your standards are not, the HR624mk2 delivers big-monitor honesty in a footprint that fits.