2x HK Audio LS4000A Active 18" Subwoofer 1200W Linear 5 Speaker


This bundle includes:
2x HK Audio Linear 5 Active 18" Subwoofers

Vendor: HK Audio
SKU: SKU5385
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L SUB 4000 A is a flexible 18″ double vented bandpass subwoofer. Compatible with all LINEAR 5 full-range speakers and mid/high units, its powerful low end – ranging from 30 to 100 Hertz – is totally and powerfully impressive. L SUB 4000 A can also serve as a sub-low add-on to LINEAR SUB 2000 to beef up the bottom end in the range of 30 to 70 Hertz.

Powerful and versatile 18″ subwoofer
Rugged wooden enclosure of birch multiplex: 15/18 mm, 9/13 ply
1200 W
31 Hz – X-Over
137 dB half space
1 x 18″ with 4″ voice coil
Compatible with all LINEAR 5 full-range speakers and mid/high units
Ideal add-on for setups using LINEAR 5 LTS A
Sub-low add-on to LINEAR SUB 2000 (A)

Max SPL 135 dB half space (@ 10% THD)
Max SPL peak 137 dB half space (@ 10% THD)
Max SPL calculated 138 dB half space
Frequency response +/- 3 dB 39 Hz – X-Over
Frequency response -10 dB 31 Hz – X-Over
Power Rating 1200 W
Amplifier Class D
Active protection circuits Undervoltage Protection, Thermoprotection, Short Circuit Protection, Overcurrent Protection, Subsonic 24 dB/oct., Peak Limiter
LF Speaker 1 x 18" featuring advanced ventilated voice coil gap
Cut-off Frequency active 70 Hz /100 Hz variable with 24 dB/oct.
Connections 2 x XLR–1/4"-Combo In, 2 x XLR Thru, 2 x XLR Mid/High Out
Input Sensitivity +4 dBu @ Gain center-notched
Pole mount 2 x M20 (K&M)
Handles 8 x HK Audio MultiGrip
Enclosure Birch multiplex
Grille 2 mm metal grille backed with black acoustic foam
Finish Acrylic enamel, black
Optional accessories Protective cover, M20 Distance Pole Add-On, 100 mm casters, tilt unit


91 x 51 x 81 cm


59 kg (Single Unit)

Delivery & Returns

Free Delivery

This is offered on all products regardless of order value to all mainland UK postcodes. Your purchase will be with you within 3 working days of your order being placed. If you are in the Scottish Highlands, Northern Ireland, Isle of Man and the Channel Isles you will still get free delivery but your order may take up to 5 working days to get to you.

I need my products quickly- can you help?

Absolutely! At check out you can select the option that suits you best.
We offer Next day, Saturday, Pre-10am and Pre-12pm delivery.
Unfortunately these options are not yet available for customers in the Scottish Highliands, Northern Ireland, Isle of Man and the Channel Isles.

When is the cut off for Next day delivery?

If you place your order before 2pm Monday- Friday, we will dispatch the same day.

For more information, including International delivery please click here.


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