Name: Blackline Q218
Rating: 4.7 (23 reviews)

Blackline Q218 is a high-performance, dual-driver subwoofer designed to complement BlacklineQ Series full-range loudspeakers. It extends the system’s low-frequency response down to 38 Hz, delivering powerful bass performance with a peak SPL of 136dB (142dB for crest factor 4) for exceptional low-end impact.

Features

Dual-driver, direct radiator subwoofer
2 x 18” (460mm) drivers with 4” (102mm) voice coils
Peak SPL of 136dB (142dB 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

Applications

Portable sound reinforcement
Live music clubs
Bars and restaurants
Nightclubs
Corporate AV events and conferences
Weddings and parties
Secondary stages at festivals
Houses of worship, leisure centres and retail outlets

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.

Links

Datasheet Brochure User guide

Specification

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]	101 dB
Maximum SPL [4]	130 dB continuous, 136 dB peak, 142 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)

Architectural Specs

Martin Audio Blackline Q218

The subwoofer shall be a passive, direct-radiating system. It shall feature two 18” (460 mm) low-frequency drivers with 4” (102 mm) voice coils, housed in a robust plywood enclosure with slot ports to enhance efficiency and reduce air noise.

The on-axis frequency response shall be 38 Hz to 100 Hz (±3 dB), with low-frequency extension down to 31 Hz (–10 dB). The subwoofer shall be capable of producing a peak SPL of 136 dB (142 dB with crest factor 4) at 1 metre. Nominal impedance shall be 4 ohms. The system shall require external amplification and processing. For optimal performance, it shall be used in conjunction with a dedicated electronic controller such as a Martin Audio DX series processor, paired with a VIA series amplifier, or with an iKON series combined amplifier and processor.

The enclosure shall be finished in durable black paint and fitted with a perforated, impact-resistant steel grille. It shall include an M20 / 1.4” (35 mm) pole-mount socket for use with full-range loudspeakers and three NL4 connectors, one of which shall be positioned for linking when the Q218 is in a vertical orientation. The cabinet shall also include four ergonomic side handles, M10 flying inserts and rubber feet for both vertical and horizontal operation. Rebate recesses shall be provided for secure horizontal stacking and fittings shall be included for optional castors.

Dimensions (W x H x D) shall be 536 mm x 1206 mm x 690 mm (21.1 in x 47.5 in x 27.2 in). Weight shall be 82.5 kg (181.9 lbs).

The loudspeaker shall be the Martin Audio Q218.

Technical Drawings & 3D Models