Martin Audio Blackline Q218 Passive 2 x 18" Subwoofer - Black

Blackline Q218 features dual 18” (460 mm) drivers with 4” (100 mm) voice coils, housed in a robust plywood enclosure finished in hard-wearing black paint. A perforated, impact-resistant steel grille protects the drivers, while slot ports ensure efficient airflow and reduced turbulence for cleaner low-frequency performance.

Designed for flexible deployment, Q218 can be used singly, stacked or flown via integral M10 inserts. It includes an M20 1.4” (35 mm) pole-mount fitting for seamless integration with other loudspeakers in BlacklineQ series. There are two signal link outputs—one positioned at the top and one at the bottom of the enclosure when oriented vertically. This allows for flexible, discreet and tidy signal connections to other BlacklineQ loudspeakers, regardless of setup.

Four ergonomic side handles facilitate easy handling and rubber feet on the base align with top-surface recesses to ensure stable stacking. A castor kit is available as an optional accessory.

When used with BlacklineQ Series full-range systems, crossover and EQ functions can be managed via the DX0.4, DX0.6, or DX4.0 system controllers, or the onboard DSP of an iKON amplifier.

Dual-driver, direct radiator subwoofer
2 x 18” (460mm) drivers with 4” (102mm) voice coils
Peak SPL of 142dB (148dB for crest factor 4)
Durable plywood enclosure
Slot ports for reduced air noise
Perforated steel grille
M20 / 1.4” (35mm) pole-mount socket
4Ω nominal impedance Integral ergonomic handles
Feet for vertical or horizonal operation
Rebate recesses for stable horizontal stacking
M10 flying inserts
Fittings for optional castors
Three NL4 connectors

Type High-performance, dual 18" driver subwoofer
Frequency response (4pi) [1] 38 Hz – 100 Hz ± 3 dB, -10 db @ 31 Hz
Driver 2 x 18” (460 mm) with 4” (100 mm) long excursion voice coil, ferrite motor system
Rated power [2] 1600 W AES, 6400 W peak
Required electronics Processor and amplifier, or a combined amplifier-processor unit
Recommended electronics DX0.4, DX0.6 or DX4.0 system processor and VIA amplifier, or iKON amplifier-processor
Sensitivity [4] 104 dB
Maximum SPL [2][4] 136 dB continuous, 142 dB peak, 148 dB peak with crest factor 4
Nominal impedance 4 ohm
Dispersion Omnidirectional
Crossover Not applicable
Enclosure Durable plywood
Finish Black textured paint
Protective grille Black perforated steel grille with scrim cloth backing
Connectors 3 x NL4 connectors: 2 at bottom rear (input and link A), 1 at top rear (link B)
Pin connections (input) 1+/1–
Pin connections (link A) 1+/1– to 1+/1– and 2+/2– to 2+/2–
Pin connections (link B) 2+/2– on input to 1+/1– on link B
Fittings 24 x M10 inserts: 4 on top, 4 on bottom, 6 on left, 6 on right, 4 on rear
16 x M8 inserts on rear for optional castors
4 x bar handles with recycled ABS pockets: 2 on top, 2 on bottom
M20 top-mounted thread plate for pole mounting
4 x skids on base: for standing vertically
4 x skids on right side, 4 x recesses on left side: for stacking horizontally
Dimensions (W) 536 mm x (H) 1206 mm x (D) 690 mm
(W) 21.1 in x (H) 47.5 in x (D) 27.2 in
Weight 82.5 kg (181.9 lbs)