LINEAR 9 118 Sub A
The Linear 9 118 Sub A is built around a simple idea: serious low-frequency output shouldn't require a cabinet that's difficult to move or awkward to place. At 42 kg (91.5 lbs), this bass-reflex active subwoofer delivers a powerful punch and precise playback while staying compact enough for easy transport between gigs, venues, or studio sessions.

Engineered for Flexible Deployment
The Linear 9 118 Sub A supports cardioid setups both mechanically and via onboard filter presets (Front, Cardioid 1:1, Cardioid 2:1, and Remote), giving engineers real control over low-frequency dispersion and stage bleed — a feature typically reserved for larger, more expensive systems. An included stereo preamplifier makes it a natural fit for 2.1 systems, letting it serve as the low-end anchor for a compact yet full-range setup.
Power and Precision Under the Hood
Behind the grille sits a single 18" cone speaker with a 4" voice coil, driven by a Class D biamped amplifier delivering 1,100W RMS. A DSP preamplifier with a 96kHz sample rate and under 2.6ms of latency keeps the low end tight and responsive, while a full parametric 10-band EQ, low-pass filter, adjustable delay, and RMS/Peak limiter give engineers precise control over how the sub integrates with the rest of the system. Max SPL reaches 129 dB average and 131 dB peak — real headroom for demanding environments.
Built to Move, Built to Last
The cabinet is constructed from birch plywood with a durable PU coating, finished in Jet Black (RAL 9005). A steel front grille with anticorrosive coating and backed acoustic foam protects the driver without compromising output. Two HK Audio MultiGrip carrying handles and an integrated M20 pole mount make positioning and transport straightforward, whether it's going on a truck or up on a pole for a mid/high array.
Why We Love This
Our Gear Experts reach for the Linear 9 118 Sub A when they need real low-end authority without hauling around a cabinet that fights them at every load-in. The onboard cardioid presets mean less low-frequency spill onto the stage without extra hardware, and the DSP CONTROL software (Windows, Mac OS) puts fine-tuned adjustment in reach from a laptop. It's a subwoofer built for engineers who need precision, not just volume.
Features:
- 18" low frequency driver with 4" voice coil
- 1,100W RMS Class D biamped power amplifier
- 129 dB average / 131 dB peak max SPL
- Onboard cardioid filter presets — Front, Cardioid 1:1, Cardioid 2:1, Remote
- Built-in stereo preamplifier, ideal for 2.1 systems
- Parametric 10-band EQ with variable filter characteristics
- MILAN digital audio transmission support
- HK Audio DSP CONTROL software compatible (Windows, Mac OS)
- Birch plywood cabinet with durable PU coating
- Compact 42 kg design for easy transport