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SX SeriesInstalled SoundLive Sound


Compact, High Performance Cardioid Subwoofer

SXC115 Compact, High Performance Cardioid Subwoofer
Where to Buy or Rent

Designed for touring sound and installations, the SXC115 is a compact, high performance cardioid subwoofer. It features a 15” (380mm) forward facing driver and a 12” (300mm) rear facing driver, each driven independently by separate amplifier channels and DSP. Each driver has its own chamber with optimised bass reflex porting


  • Compact, cardioid subwoofer
  • Front facing 15” (380mm)/4” (100mm) voice coil driver
  • Rear facing 12” (300mm)/4” (100mm) voice coil driver
  • Cardioid dispersion pattern
  • 28dB rear rejection at 75Hz
  • High output capability
  • Tour-grade plywood enclosure


  • Live sound reinforcement
  • Fixed installations including live event venues and nightclubs
  • Theatre sound
  • Corporate AV events
  • Acoustically-challenging rooms
  • Outdoor restaurant, bar and hotel entertainment areas
  • Concourses and Theme Parks

Each driver has its own chamber with optimised bass reflex porting. This arrangement produces a cardioid dispersion pattern which maximises the front radiation and reduces unwanted radiation behind the subwoofer.

SXC115 Internal View
SXC115 Internal View

The SXC115 produces a cardioid dispersion pattern which maximises the front radiation and reduces unwanted radiation behind the subwoofer. The recommended iK42 amplifier optimises the DSP parameters for front and rear drivers to maximise the rear rejection — from 21dB at 43Hz to 28dB at 75Hz. This keeps low frequencies away from stages, turntables and walls as well as reducing reverberant energy in the room — greatly improving the low frequency response accuracy and impact of the whole system. In front of the enclosure, the output from the two drivers is additive, giving an extra 2dB of output when compared with a conventional 1 x 15” subwoofer.

The SXC115 is an ideal partner for WPM line arrays or Martin Audio point source systems where low frequency pattern control is required. It can be used singly, stacked or flown individually by means of threaded flying inserts.

The enclosure is constructed from birch ply and finished with a hard-wearing textured paint. It is equipped with four grab handles and foam-backed perforated steel grilles protect the front and rear drivers. Interlocking skids prevent movement when stacked and a threaded plate in the top surface facilitates pole-mounting of up to 4 WPM enclosures or a single point source loudspeaker.

The addition of the input cover accessory makes the SXC115 weather resistant and suitable for outdoor usage.

User guide Brochure Datasheet
TYPECompact, cardioid subwoofer
FREQUENCY RESPONSE (1) 44Hz – 150Hz ±3dB, -10dB @ 36Hz
  • 15” (380mm)/4” (100mm) voice coil, long excursion, ferrite magnet, waterproof cone
  • 12” (300mm)/4” (100mm) voice coil, long excursion, neodymium magnet, waterproof cone
  • 15”: 1000W AES, 4000W peak
  • 12”: 800W AES, 3200W peak
MAXIMUM SPL (9) 137dB peak
  • 15”: 8 ohms
  • 12”: 8 ohms
DISPERSION (-6dB) Cardioid
ENCLOSURE Multi-laminate birch ply
FINISH Textured black paint
PROTECTIVE GRILLE Black HEX perforated steel
PIN CONNECTIONS (INPUT) 15”: +1, -1; 12”: +2, -2
PINS CONNECTIONS (LINK) 15”: +1, -1; 12”: +2, -2
  • Two skids on base, with mating channels on top
  • M20 top-mounted thread plate for pole mounting
  • Two bar handles on each side
  • 16 x M10 mounting points
  • 16 x M8 inserts for optional castors
  • (W) 500mm x (H) 550mm x (D) 811mm (939mm incl castors)
  • (W) 19.69in x (H) 21.67in x (D) 31.92in (36.96in incl castors)
  • 53kg (117lbs), 56kg (124 lbs) incl castors
Architectural Specs
Martin Audio SXC115

The loudspeaker shall be a compact cardioid subwoofer consisting of a 15” reflex-loaded transducer radiating to the front of the enclosure and a 12” reflex-loaded transducer radiating to the rear. The transducers shall be driven independently by separate channels of a dedicated controller amplifier.

Power handling of the 15” transducer shall be 1000W AES, 4000W peak and power handling of the 12” transducer shall be 800W AES, 3200W peak. Rated impedance of each transducer shall be 8 ohms. The on-axis frequency response shall be 44Hz- 150kHz +/- 3dB and the loudspeaker shall produce a maximum SPL of 137dB peak calculated at 1 metre.

The loudspeaker enclosure shall be constructed from multi- laminate birch ply with a textured coating. The drivers shall be protected by a perforated steel grille and the enclosure shall be fitted with a threaded pole-mount plate, bar handles, skids and flying inserts. The rear connector panel shall be fitted with two NL4 type connectors.

Dimensions including skids, excluding castors (W x H x D) shall be 500mm x 550mm x 811mm (19.69in x 21.67in x 31.92in). Dimensions including skids and optional castors (W x H x D) shall be 500mm x 550mm x 939mm (19.69in x 21.67in x 36.96in). Weight excluding castors shall be 53kg (117lbs). Weight including optional castors shall be 56kg (124lbs).

The loudspeaker shall be the Martin Audio SXC115.

Martin Audio Martin Audio SXC115 Tech Drawing

Technical Drawings for Martin Audio SXC115.
All information is Copyright. Martin Audio Ltd.


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Subject to change without notice.
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