BS18 – Folded Sub Bass Cabinet


BS18 is part of our premiere touring range, ideally suited for concerts and outdoor events.

The innovative folded horn enclosure incorporates a 1000w RMS 18” driver specifically designed to withstand the large excursions typical of high level sub bass reproduction. Large deflector ports ensure resonance is kept to a minimum and forms the bass foundation for a very powerful Blacka Group portable PA system, specially suited to live music reproduction and outdoor festivals.

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  • Main Application
    Concerts and live outdoor events bass frequency reinforcement
  • Complementary Speakers
    Can be reinforced with FES10/12 mid high cabinets
  • Dimensions
    W: 57cm. H: 104.3cm. D: 76cm
  • Power
    1000w RMS. 2000w Peak
  • Drivers
    18” bass driver
  • Mounting
    Floor Bases
  • Quick Specs
    BS18 folded horn enclosure features a single loaded 18” reflex sub woofer and has a frequency response of 35Hz to 160Hz
  • Model
    BS 18
  • Type
    Folded Horn Sub Bass Cabinet
  • Frequency Response
    From 35Hz – 160Hz
  • Rated Power
    1000w RMS – 2000w Peak
  • Sensitivity
  • Maximum SPL
  • Dispersion
  • Nominal
    8 Ohms
  • Bass
    18” Driver
  • Mid
  • High Frequency
  • Crossover
  • Enclosure
    Multi Laminated Birch Ply
  • Finish
    Textured Black Paint
  • Grille
    Black Perforated Steel
  • Connector
    2 x Neutrik NL4
  • Fittings
    2 x Castors 2 x Recessed Metal Bar Handles
  • Dimensions
    (W) 57 cm x (H) 114.5 cm x (D) 76.2 cm
  • Weight

Each connector panel has two Neutrik Speakon connectors wired in parallel. The second connector allows use of a short link lead to power a secondary parallel loudspeaker. The connectors are wired as follows:

  • 2 Core cable
  • Pin 1 Positive
  • Pin 1 Negative

When connecting Blacka Group sound reinforcement to an amplifier it is recommended that the return resistance of the cable used is less than one tenth of the normal impedance of the system or systems in parallel the chart below gives an indication of the maximum possible cable runs for conductor cross sectional areas.

  • Conductor CSA
    Maximum Cable Lengths
  • 4 OHMS
    8 OHMS
    10 OHMS
  • 1.0 mm
    11 m
    22 m
    44 m
  • 1.5 mm
    17 m
    34 m
    68 m
  • 2.0 mm
    22 m
    44 m
    88 m
  • 2.5 mm
    29 m
    58 m
    116 m
  • 4.0 mm
    44 m
    88 m
    176 m
  • 6.0 mm
    66 m
    132 m
    264 m

The Blacka Group TFR 5T is designed to be used with professional power amplifiers capable of producing a minimum specification of 50w – 100w power output into 4 ohms.

Care should be taken to avoid amplifier clipping, it is important to understand that a low power amplifier driven into clipping is more likely to damage a loud speaker than a higher power amplifier used within its ratings. Primarily because music signals have a high peak to average crest factor. When an amplifier is severely overdriven its output waveform is clipped resulting in squared off peaks and thus reducing the crest factor. In extreme cases, the waveform can approach that of a square wave. An amplifier is normally capable of producing far more power under these conditions than its undistorted rated power output. The use of very high power amplifiers with outputs greater than those recommended is discouraged.

Care should be taken to avoid switch on surges, which can result in momentary power peaks in excess of specified ratings. When powering up a sound system it is important to switch on the amplifiers after the mixer and control electronics have stabilised. When powering down the system, reverse the sequence and switch off the amplifiers first.

The BS15 units can be used with a wide array of Blacka Groupspeakers. Typical configurations are listed below

Nightclub: TFR1201 – TFR 1202 – TFR 1502S – TFR 1502L – FES 10 – FES 12

Live Music: – TFR 1202 – TFR 1502L – FES 10 – FES 12

Arena / Outdoor: – FES 10 – FES 12 – FES LMF

It is important that loudspeaker systems are used in a safe manner. Please take some time to review the following points concerning use of Blacka Group Loudspeakers.

Professional loudspeakers are capable of producing extremely high sound levels and should be used with care. Hearing loss is cumulative and can result from levels above 90 DB if people are exposed for a long period , never stand close to loudspeakers driven at high level.


  1. The BS15 is a relatively heavy unit and should always be lifted by two people.
  2. Ensure that the floor or stage is level and solid.
  3. Do not stack speakers too high when outdoors as high winds can topple stacks.
  4. Be aware that these speakers produce very high levels of output. They can move or creep, to avoid any problems it is advisable to strap the speakers down when stacking.