SL subwoofer

SL-SUB subwoofer front

SL subwoofer


Large format flyable cardioid subwoofer

  • Components 3 x 21"
  • Dispersion Cardioid
  • SPLmax 144 dB
  • Weight 138 kg / 304 lb

Product description

The SL-SUB and SL-GSUB are cardioid subwoofers to compliment the GSL and KSL Systems. The SL-SUB rigging hardware allows columns of up to 14 cabinets to be flown while the SL-GSUB is intended for ground stacked applications only. Both subwoofers are actively driven 2-way bass-reflex designs housing three long excursion 21" neodymium drivers. Two drivers face to the front while one radiates to the rear. The front and rear facing drivers operate in independent bass reflex chambers and are driven from separate amplifier channels. The cardioid dispersion pattern reduces unwanted energy behind the system, resulting in less excitation of the reverberant field to deliver highly accurate low frequency reproduction. The frequency response extends from 33 - 84 Hz / 30 - 65 Hz. The SL-SUB cabinet incorporates front and rear rigging strands while the SL-GSUB has no rigging components and is intended for ground stack purposes. The cabinets are constructed from marine plywood with an impact and weather protected PCP (Polyurea Cabinet Protection) finish. The front and rear of the subwoofers are protected by rigid metal grills backed by an acoustically transparent and water repellent fabric. Two runners extend from the front to rear to protect the bottom panel. Two correspondingly shaped recesses are incorporated in the top panel accepting the runners and preventing cabinet movement when subwoofers are stacked. The side panels incorporate four recessed handles and four heavy duty wheels are mounted on the rear of the subwoofers.


The d&b D80 amplifier is required to drive the SL-SUB. The 2-Way active mode for the SL-SUB requires two channels of the D80.


Architectural specifications for detailed project planning

Do you require architectural specifications? For a d&b system or a specific d&b Series? Here are the most important technical specifications ready for download.

System data
Frequency response (-5 dB standard)
33 Hz - 84 Hz
Frequency response (–5 dB INFRA mode)
30 Hz - 65 Hz
Max. sound pressure (1m, free field)1
with D80
144 dB
Cabinets per D80
Loudspeaker data
Nominal impedance front/rear
3/6 ohms
Power handling capacity front (RMS/peak 10 ms)
1000/4000 W
Power handling capacity rear (RMS/peak 10 ms)
500/2000 W
3 x 21" driver
1 x NLT4 F
Dimensions / weight
Dimensions (H x W x D)
585 x 1300 x 9752 / 1100 mm
23.0 x 51.2 x 38.42 / 43.3"
138 kg
304 lb

1 SPLmax Broadband signal IEC 60268
2 dimensions without wheels

SL-Series tutorial. SL-Sub. 7. Sub-rigging

1/2 – SL-Series tutorial. SL-Sub. 7. Sub-rigging

SL-Series tutorial. SL-Sub. 8. Sub de-rigging

2/2 – SL-Series tutorial. SL-Sub. 8. Sub de-rigging

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Mobile application or fixed installation? Indoors or outdoors? Large or small? d&b provides tailored-made solutions for each and every requirement. What is more, the dedicated simulation software optimizes the planning of the system installation.
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