RF215 – Dual Loaded Bass Cabinet


The RF215 bass cabinet is ideally suited for medium sized nightclubs and live band pa.

The compact ported reflex enclosure incorporates 2 x 700w RMS 15” bass drivers specifically designed to extend the low frequency and provide a warm punchy bass in a nightclub environment. Six circular ports ensures optimum cabinet tuning. The RF215 is ideal for either a small permanent installations in venues which require extended bass frequency for DJ, live and background music reproduction.

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  • Main Application
    Medium sized nightclub bass frequency reinforcement / live band PA
  • Complementary Speakers
    Can be reinforced with TFR 1201/1202/1502S/1502L full range cabinets
  • Dimensions
    W: 58.5cm. H: 96cm. D: 60cm
  • Power
    1400w RMS. 2800w Peak
  • Drivers
    2 x 15
  • Mounting
    Floor based
  • Quick Specs
    RF15 features a dual loaded 15” reflex bass driver and has a frequency response of 35Hz to 120Hz
  • Model
  • Type
    Vented Reflex Bass Cabinet
  • Frequency Response
    From 35Hz – 120Hz
  • Rated Power
    1400w RMS – 2800w Peak
  • Sensitivity
  • Maximum SPL
  • Dispersion
  • Nominal
    4 Ohms
  • Bass
    2 x 15” Drivers
  • Mid
  • High Frequency
  • Crossover
  • Enclosure
    Multi Laminated Birch Ply
  • Finish
    Textured Black Paint
  • Grille
    Black Perforated Steel
  • Connector
    2 x Neutrik NL4
  • Fittings
    1 x Top Hat Fitting 2 x Recessed Bar Handles 4 Castors
  • Dimensions
    W: 58.5cm. H: 96cm. D: 60cm.
  • 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 RF215 is designed to be used with professional power amplifiers capable of producing a minimum specification of 1400w – 2800w 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 RF12 units can be used with a wide array of Blacka Group speakers. Typical configurations are listed below

Large Bars/Small Nightclubs: TFR 25T – TFR 801 – TFR 1001 – TFR 1201 – TFR 1202 – TFR 1502S – TFR 1502L

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. Ensure that the floor or stage is level and solid.
  2. Be aware that these speakers produce very high levels of output, So be aware that they can move or creep.