HK LINEAR-SUB-4000 2400 Watt 2 x 18" Passive Subwoofer

The HK LINEAR SUB 4000 is a high-powered 18" dual vented bandpass subwoofer designed to deliver thunderous low-frequency response down to 31 Hz. Built to perfectly complement all LINEAR 5 full-range and mid/high units—especially the LINEAR 5 LTS long-throw system—it’s ideal for large venue applications requiring serious low-end extension. With 2400W program handling and up to 137 dB peak SPL, this passive subwoofer is a powerful addition to any performance rig or installed system. Compatible filter presets are available for Lab.Gruppen IPD and PLM 12K44 controllers.

Features

• 2400W program / 1200W RMS power handling for high-impact low-end response
• 18" woofer with 4" voice coil and ventilated gap for superior thermal performance
• Extended frequency response down to 31 Hz (-10 dB) for deep bass punch
• Peak SPL up to 137 dB for high-pressure, distortion-free output
• Compatible with all LINEAR 5 speakers and the LINEAR 5 LTS system
• Filter presets available for Lab.Gruppen IPD and PLM 12K44 amps
• Dual SpeakON NL4 connectors with switchable pin assignment (1+/1– or 2+/2–)
• 8 ergonomic MultiGrip handles for easy transport and rigging
• Dual M20 threaded pole mounts for flexible top box mounting
• Heavy-duty birch multiplex enclosure with black acrylic enamel finish

Specifications

Acoustic Performance
- Power Handling (RMS): 1200 W
- Power Handling (Program): 2400 W
- Frequency Response (±3 dB): 39 Hz – X-over
- Frequency Response (-10 dB): 31 Hz – X-over
- Max SPL (Avg @ 10% THD): 135 dB (half space)
- Max SPL (Peak @ 10% THD): 137 dB (half space)
- Sensitivity (1W/1m): 106 dB (half space)
- Impedance: 4 ohms
- Crossover Frequency: 100 Hz (active X-over with controller amp; adjustable for sub-low use)

Driver
- LF Driver: 1 x 18", 4" voice coil with advanced ventilated voice coil gap

Connectivity
- Connectors: 2 x Speakon NL4
- Pin Assignment: Switchable between 1+/1– and 2+/2–

Construction
- Housing: Birch multiplex
- Finish: Black acrylic enamel
- Grille: 2 mm steel grille backed with black acoustic foam
- Handles: 8 x MultiGrip
- Pole Mounts: 2 x M20 threaded inserts

Dimensions & Weight
- Dimensions (WxHxD): 91 x 51 x 81 cm (35.83" x 20.08" x 31.89")
- Weight: 57.1 kg (125.9 lbs)