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MLD - Multi-Cellular Loudspeaker Array Downfill
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In order to match the performance and tonal balance of MLA, the MLD has been designed around the same acoustic format and electronics package. Coherent arrays of MLA and Downfill can easily be constructed to seamlessly cover the audience planes.


  • Downfill for MLA system
  • Three-way all-horn design delivers
    LF/MF/HF peak SPL’s of 139/139/140dB
  • 120°H x 20°V coverage
  • 52Hz-18kHz ± 3dB full bandwidth frequency response


  • Large-scale touring sound reinforcement for
    outdoor festivals, stadia, arenas and concert halls
  • Premium fixed installations in
    concert halls, theatres and sports venues

The MLD Downfill is an important MLA System component. Using just one – or at most - two Downfills to cover the first few rows maximises the projection and efficiency of the entire array.

Line array systems project, or throw better when the inter-cabinet angles are small. Unfortunately real-world requirements often dictate that the flown array must cover right up to the stage barrier. Arrays designed in this manner take on the familiar, highly-curved, banana shape. This is wasteful of array elements as almost half the array ends up being used to cover the first thirty metres/one hundred feet - leaving fewer boxes to reach the back seats.

The solution is to add a cabinet with a wider vertical dispersion. In the Downfill’s case this is 20°. Using only one - or at the most two - Downfills at the bottom of an array results in a lower curvature more directional array that projects much further and covers right up to the stage barrier.

The Downfill’s benefits are not confined to the vertical plane. With an extremely wide horizontal dispersion of 120°, the Downfill reaches to front-row-central as well as the ends of the front rows.

Our HiBlade™ patent-pending technology ensures ultra-high frequencies propogate right out to the edges of the dispersion pattern. Conventional 120° horns without this device tend to lose high frequency sparkle rapidly, as the listener moves off axis.

Brochure User guide Datasheet


TYPEThree-way cellular drive, active array element
  • LF: 133dB continuous, 139dB peak (3)
  • MF: 133dB continuous, 139dB peak (4)
  • HF: 134dB continuous, 140dB peak (4)
LF2x12” (300mm)/3” (75mm) voice coil, ultra-long excursion, neodymium magnet drivers, Hybrid® bass horn loaded
MF2 x 6.5” (165mm)/2” (50mm) coil, neodymium magnet drivers, horn loaded
HF3 x 1” (25mm) exit neodymium magnet compression drivers, horn loaded
Rated Power (2)
LF800W AES, 3200W peak
MF400W AES, 1600W peak
HF150W AES, 600W peak
  • (-6dB): 120º horizontal
  • (-10dB): 140º horizontal
  • 20˚ vertical
Crossover Frequencies
  • 320Hz: 8th-order Linkwitz-Riley
  • 4kHz: Vanishing Point™ FIR filters
Audio input
CONNECTORSFemale XLR input, male XLR link output
ANALOGUE INPUT IMPEDANCE20kΩ balanced to ground
MAXIMUM ANALOGUE INPUT LEVEL6.15Vrms (+18dBu), over voltage protected
AES/EBU IMPEDANCE110Ω balanced, Receive and transmit termination
CONNECTORS 2x IP68 rated 8-way, quick-release type
Amplifier Module
TYPESix channel Class D, fixed-frequency
COOLING4 x temperature controlled internal fans
1 x low-speed internal blower
1 x temperature controlled external fan
MAXIMUM AMBIENT TEMPERATURE45°C (113°F) for full output
Power Supply
TYPESwitch mode, fixed frequency with PFC AC INPUT OPERATING
RANGE100 – 240V ~ AC, 50 - 60Hz
MAINS CONNECTOR16A IEC309 (Ceeform) – IP44 rated
ENCLOSURE Vertical trapezoid with 10º wall angle, multi-laminate birch and poplar-ply construction
FINISHTextured black PU coating
PROTECTIVE GRILLEBlack HEX perforated steel
FITTINGSProprietary rigging system Bar handles on each side
Protective Rubber side-cheeks incorporating skids Wheel-board
Transit cover
Weather protection cowl
DIMENSIONS(inc. wheel-board) (W) 1136mm x (H) 454mm (458mm) x (D) 680mm (840mm)
(W) 44.7 x (H) 17.9in (18in) x (D) 26.8in (33.1in)
WEIGHT (ex. wheel-board)91.5kg, 201lbs

Architectural Specs

Architectural Specifications

The loudspeaker shall be a self-powered, three-way downfill array element. Its transducers shall consist of two 12” horn-loaded low frequency drivers, two 6.5” midrange drivers each coupled to a constant-directivity midrange horn, and three 1” exit compression drivers each coupled to a constant-directivity high frequency horn. The drivers shall be configured to be driven as one low-frequency cell, two midrange cells and three high-frequency cells.

The loudspeaker shall incorporate a Class D amplifier module with six channels of amplification and DSP for independent drive and control of each cell. The amplifier shall deliver a total of 6kW peak output to the transducers and include networking capabilities to enable remote control and system monitoring. Its power supply shall employ Power Factor Correction and operate from 100-240V, 50-60Hz AC.

Audio connectors shall be male and female XLR type and the AC power connector shall be an IEC309 CEE Form.

The loudspeaker shall have 120° horizontal dispersion and 10° vertical dispersion. Vertical dispersion of the complete array shall be determined by a combination of the splay angles between adjacent enclosures and dedicated array control software. The on-axis frequency response shall be 52Hz-18kHz +/- 3dB and the loudspeaker shall produce a maximum SPL of 139dB peak (LF), 139dB peak (MF) and 140dB peak (HF) at 1 metre.

The loudspeaker enclosure shall be constructed from multi-laminate birch and poplar ply with a textured black polyurethane coating. The drivers shall be protected by a perforated steel grille and the enclosure shall incorporate an integral rigging system to enable it to be flown as a downfill element within an array up to 24 enclosures suspended from a dedicated flying frame.

Dimensions excluding wheel-board (W x H x D) shall be 1136mm x 454mm x 680mm (44.7in x 17.9in x 26.8in). Weight shall be 91.5kg (201lbs).

The loudspeaker shall be the Martin Audio MLD.


Also Available in this Series...

MLA Product Shot
MLA - Multi-cellular Loudspeaker Array [MLA Systems]


3-way Cellular Drive

Active Array
Featuring 2 x 12” LF

MLX product shot
MLX - Hybrid® Horn/Reflex Subwoofer [MLA Systems]


Hybrid® Horn/Reflex

2 x 18” Subwoofer
for MLA

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