Martin Audio Blackline S218 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 2 x 18" dual driver sub

Dual-driver vented sub-bass system

The powerful Blackline S218+ sub-bass system has been designed to be used with large scale Blackline F12+ and F15+ systems to extend and increase the total low frequency output power. It can also be used as the low frequency section of a bi-amped or tri-amped H3+ system. The S218+ provides good bass punch with extended sub-bass output from two new, long-excursion, 18” (460mm)/4” (100mm) voice coil drivers with water resistant cones and triple roll surrounds.

The S218+ must be electronically crossed over with the M3+, DX1.5 or equivalent Electronic Controller.


Direct radiating 18” (460mm) drivers

High temperature 4” (100mm) voice coil

Fitted with handles and castors

Five year limited warranty



Large scale club performance

Large club installs

TYPE Dual-driver, vented sub-bass system


-10dB @ 28Hz

DRIVERS 2 x 18” (460mm)/4” (100mm) voice coil LF drivers

RATED POWER (2) 1500W AES, 6000W peak


SENSITIVITY (3) 105dB (half space)

MAXIMUM SPL (9) 136.5dB continuous,

142.5dB peak (half space)



CROSSOVER 80-150Hz active

ENCLOSURE 320 litre, multi-laminate birch ply

FINISH Textured black paint

PROTECTIVE GRILLE Black perforated steel

CONNECTORS 2 x Neutrik NL4

PIN CONNECTIONS LF+,- : 1+,1- and 2+,2-

FITTINGS 4 x 4” (100mm) castors

6 x pocket handles

2 x lid clips

DIMENSIONS (inc wheels) (W) 561mm x (H) 1066mm x (D) 780mm (911mm)

(W) 22.1ins x (H) 42ins x (D) 30.7ins (35.9ins)

WEIGHT 87kg (191.5lbs)