Martin Audio Blackline S18 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.


Direct radiating 18" high power sub

The compact Blackline S18+ sub-bass system has been designed to be used with Blackline F12+ and F15+ full-range systems to extend and increase the total low frequency output power. The S18+ provides good bass punch with extended sub-bass output from a new, long-excursion, 18” (460mm)/4” (100mm) voice coil driver with a water resistant cone and triple roll surround.

The S18+ is provided with a top hat fitting that can be used to pole mount an F12 or F15 above the enclosure.


Compact vented sub-bass

Direct radiating 18” (460mm) driver

High temperature 4” (100mm) voice coil

Large ports ensure low air noise

Top hat fitting for pole mounting F12+/F15+

Five year limited warranty


Live club performance

Club installs

AV presentations

TYPE Compact, vented sub-bass system


-10dB @ 35Hz

DRIVERS 18” (460mm)/4” (100mm) voice coil LF driver

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


SENSITIVITY (3) 102dB (half space)

MAXIMUM SPL (9) 130.5dB continuous,

136.5dB peak (half space)



CROSSOVER 120Hz active/passive low pass filter

ENCLOSURE 150 litre, multi-laminate birch ply

FINISH Textured black paint

PROTECTIVE GRILLE Black perforated steel

CONNECTORS 2 x Neutrik NL4

PIN CONNECTIONS LF+,- : 1+,1- , Link thro’: 2+,2-

FITTINGS 1 x mounting pole socket

4 x pocket handles

DIMENSIONS (W) 561mm x (H) 690mm x (D) 595mm

(W) 22.1ins x (H) 27.2ins x (D) 23.4ins

WEIGHT 45kg (99lbs)