Martin Audio Blackline H3 Plus

Blackline+ systems are synonymous with exceptional sound quality and reliability and have become the benchmark for premium live music venues, nightclubs and installations worldwide.

All low frequency drivers used in the two-way systems now benefit from the addition of aluminium demodulation rings to minimise the variation in voice coil inductance as the coil moves in the gap. The result is improved midrange clarity and reduced intermodulation distortion at high excursions, ensuring that the sound balance and quality is maintained even at high levels.

In the development of the Blackline+ Series, special attention has also been given to matching the directivity of the low frequency drivers to the HF horns in the crossover region. This has been achieved by careful choice of LF cone profiles, together with improvements in the crossover design.

Blackline+ – superior by design.


3way bi-amp 15" vertically oriented high power system

Three-way bi-amp trapezoid Hybrid® fully horn loaded

The Blackline H3+ is a very high performance, all-horn, three-way system in a single, wide-bandwidth package. New drivers have been developed for improved performance in all bands. The Hybrid® low frequency section comprises a horn-loaded 15” (380mm)/4” (100mm) voice coil driver that is reflex loaded to extend the LF output to below the natural cut-off point of the horn. The new LF driver features a water resistant cone and triple roll surround for increased excursion.

The mid-horn of the H3+ has a unique ‘phase-ball’ loading device which maintains the constant directivity characteristics of the horn at the upper end of its range. It is driven by a new 10” (250mm) midrange driver with an aluminium demodulating ring for improved high-mid clarity and reduced distortion when driven hard. The 70° x 40° HF section of the H3+ features a neodymium 1” (25mm) exit compression driver with a Kapton diaphragm for high sensitivity and extended HF performance. The internal mid/high passive crossover allows this three-way system to be driven in a bi-amp configuration.

A Martin Audio M3+ or DX1.5 Electronic Controller is available to provide H3+ crossover and limiter facilities.



All-horn three-way system

‘Phase-ball’ loaded mid-driver

Hybrid® LF section

Fitted with handles and castors

Five year limited warranty


Larger club performance

Large scale installs


TYPE Three-way bi-amp trapezoid Hybrid® fully horn loaded


DRIVERS 15” (380mm)/4” (100mm) coil bass driver

10” (250mm)/2.5” (63.5mm) coil mid driver

1” (25mm) exit HF compression driver

RATED POWER (2) LF: 750W AES, 3000W peak

MF + HF: 300W AES, 1200W peak


SENSITIVITY (6) LF: 104dB, MF + HF: 104dB

MAXIMUM SPL (9) 133dB continuous, 139dB peak

NOMINAL IMPEDANCE LF: 8 ohms, MF + HF: 8 ohms

DISPERSION (-6dB) 70 ° horizontal, 40 ° vertical

CROSSOVER 200Hz active, 2kHz passive

ENCLOSURE 250 litre, multi-laminate birch ply

FINISH Textured black paint

PROTECTIVE GRILLE Black perforated steel

CONNECTORS 2 x Neutrik NL4

PIN CONNECTIONS LF+,- : 1+,1-, (MF + HF) +,- : 2+,2-

FITTINGS 12 x M10 inserts

4 x 4” (100mm) castors,

4 x pocket handles

DIMENSIONS (inc wheels) (W) 560mm x (H) 1066mm x (D) 780mm (911mm)

(W) 22ins x (H) 42ins x (D) 30.7ins (35.9ins)

WEIGHT 77.5kg (170.5lbs)