How Bose Professional's 3.5 kg MA3 aims sound away from echoey ceilings

Bose Professional has introduced the MA3 Micro Array, a passive, modular micro line array. Each white 3.5 kg box pairs a 1-inch compression driver with four 2.25-inch woofers.

Anyone who has to make speech clear in a room designed for looks rather than acoustics should pay attention. Bose Professional's announcement, which Live Design carried, quoted Shawn Watts, the company's vice president of sales for the Americas. He said cost, size and long installs had kept modular arrays out of reach for many everyday projects. Watts described the MA3 as compact, affordable and something one person can install. In his telling, it lets integrators bring an array's precise vertical coverage into a room while avoiding the large footprint, the high price tag and the hassle.

Five degrees at a time

Joao Martins, editor-in-chief of audioXpress, put the problem plainly in his technical review: architectural audio is mostly a fight to get sound to listeners while starving the ceiling and other reflective surfaces. Energy that hits those surfaces bounces back late and blurs the words. When several MA3 modules are stacked, the splay between them bends the array's vertical pattern to match the audience area.

With 5° of vertical coverage per 3.5 kg module, the MA3 turns the angle between boxes into the main tool for keeping sound off a reverberant ceiling. Total coverage depends on how many elements go into the array and how they're angled, audioXpress noted. So the module count and the angle sheet become the real design decisions, and they belong in the drawings before anyone orders hardware.

The same idea applies at a far larger scale. Live Design reported on November 10 about the Majestic Theatre in Dallas, where technical director Tim O'Heir said a serious C-curve array was needed to reach the upper balcony without reflections. Hanging it that way, he explained, kept the sound aimed straight at the seats and off the walls. That project used d&b audiotechnik XSL enclosures weighing about 86 pounds each, along with the company's ArrayProcessing. The MA3 borrows the mechanical half of that approach, the curve of the array, and puts it in a passive box light enough to lift with one hand.

Those numbers draw a clear boundary. Bose says the MA3 is designed for permanent indoor installations at moderate sound levels, and audioXpress describes it as suited to permanent installations requiring moderate sound levels. The calculated maximums suggest the same. The -10dB range extends to 71Hz, which suggests a music program that needs real bass would need separate low-frequency support. For speech and music in a reverberant space, the figures appear to fit the brief.

One more line in the preliminary data is worth reading closely: the single-module response was measured in an anechoic environment. That is a lab with no reflections at all, the opposite of the rooms the MA3 targets, so the curve is best treated as a starting point for tuning rather than a prediction of what the back pew will hear.

What a passive box leaves on the drawing

Passive means the module itself is simple. An external amplifier feeds a built-in two-way crossover at 1.8 kHz through a prewired four-pin Euroblock connector. Nominal impedance is 16 ohms. Bose's product page lists 0.8-inch (20 mm) voice coils on the woofers and a 1.0-inch (25 mm) voice coil on the high-frequency driver.

The trade is that the thinking moves into the rack. Bose Professional's product page lists its loudspeaker presets as available but not required. It does recommend a 70 Hz high-pass filter with a slope of at least 24 dB per octave to protect the drivers. audioXpress drew the practical conclusion: amplifier loading, protection and array geometry are essential parts of the design. It also cautioned that the published 100° × 5° figure shouldn't be read as constant directivity across the full frequency range.

For an integrator, that turns the 70 Hz filter into a commissioning item rather than a footnote. Our suggestion is to treat it as required on every install, even though Bose calls the presets optional. For a facilities director reviewing a bid, the useful check is whether the proposal names the amplifier, the per-channel load and where that filter lives.

Two ways to build a small array

audioXpress, which calls the MA3 "clearly inspired by" Martin Audio's O-Line, compares the two directly. The O-Line brought the idea of very compact passive arrays that can be flown and tightly controlled without the cost and complexity of DSP-steered columns. The two share a lot. The differences sit in the high-frequency section, which is exactly where a specifier should look.

• Shared: passive two-way micro line arrays, adjustable splay, nominal 100° horizontal × 5° vertical per module.
• Bose MA3: crosses over at 1.8 kHz from four nominal 2.25-inch woofers to a single compression driver with a 1-inch voice coil; slightly larger, with more packaging and mounting options.
• Martin Audio O-Line: crosses over at 2.5 kHz; two 3.5-inch woofers sit in the walls of a constant-directivity horn fed by five closely spaced 0.55-inch soft-dome tweeters, spaced to suppress vertical high-frequency sidelobes that could otherwise send energy toward reflective surfaces.

That last detail ties tweeter design straight back to the ceiling problem. Sidelobes are exactly the stray energy a splay plan is trying to keep off hard surfaces, so when a consultant weighs one against the other for a hard-walled room, vertical off-axis polar data at high frequencies is the sharper thing to ask for than the headline coverage angle. The two can look identical on that number and still behave differently above a few kilohertz.

The other route puts electronics in the box. Bose's own MA12 and MA12EX modular column arrays stack enclosures vertically for more pattern control, throw and level in demanding spaces. HK Audio's ELEMENTS MK2, which FOH magazine covered on October 6, is a modular column array with tool-free SnapLock assembly aimed at rental and mobile work.

The HK Audio system shows what self-configuring means in practice. It offers 90° of horizontal dispersion and runs up to three top units and two subwoofers; the integrated DSP detects how many tops are connected and loads the matching midrange-compensation filter, so no manual adjustment is needed. Presets (Flat, Contour, Voice and Remote) and Milan AVB streaming over a single Ethernet cable come with it. In other words, the filter decisions the MA3 leaves to the integrator's rack are handled in firmware, and the bass extension the MA3 lacks arrives as subwoofers in the same stack.

Where the crew sets up and strikes a system every week, or where nobody will own an amplifier rack, a self-configuring active column could suit better. The passive MA3 makes most sense in fixed installs where amps and processing are already part of the scope and the room's look rules out a bigger box.

One installer, two pack sizes

Each ABS enclosure measures 138 × 288 × 206 mm (5.4 × 11.3 × 8.1 in) and weighs 7.6 lb, with a powder-coated steel grille and an integrated quick-pin system for joining modules. The MA3SB suspension bracket handles flown arrays, and the MA3WB kit handles wall mounts where wall placement better suits the architecture or ceiling height, according to Bose. An optional MA3PBB pullback bracket adds another rigging choice.

audioXpress judged that this hardware makes a one-person install realistic, which goes straight to the labor line on projects where size, crew and budget are tight. Set that against the Majestic, where Gemini Light, Sound and Video had to keep 86-pound boxes within ceiling points certified at 1,000 pounds each. At the MA3's weight, the rigging conversation suggests a very different scale of labor and structural review.

Bose offers the MA3 in single-pack and four-pack configurations. The single pack (A02817-0200) ships with one module, one prewired Euroblock connector and one inter-module plate. The four-pack (A02815-0200) ships with four modules, four connectors and two plates. Bose lists houses of worship, multipurpose rooms, corporate spaces, education and government facilities and hospitality venues as targets. One small detail for spec writers: the product page lists the woofers as 2.2-inch, while the announcement says 2.25-inch.

Preliminary data, a changing name

Bose labels its MA3 technical data sheet as preliminary. For a careful buyer, that suggests a sensible next step: pilot a small array in the hardest room before standardizing across a campus.

The company behind the box is changing too. Bose Professional builds on more than 50 years of sound reinforcement work, and under CEO John Maier it has broadened its range, acquired Fulcrum Acoustic in August 2026 for its loudspeaker, DSP and immersive expertise, and plans to start its move to the 802 LABS identity in February 2027. The signal to watch is the final data sheet replacing the preliminary one, ideally with full vertical polar data. Specifications written this winter should allow for the name on that sheet to start changing within months.