J-INFRA subwoofer

J-INFRA subwoofer front
J-INFRA subwoofer back
J-INFRA subwoofer front
J-INFRA subwoofer back

J-INFRA subwoofer

Subwoofers

Large format cardioid subwoofer

    • Components 3 x 21"
    • Dispersion Cardioid
    • max SPL 144 dB
    • Weight 152 kg / 335 lb

    Product description

    The J-INFRA is a cardioid infra subwoofer that can be used to supplement J-Series systems consisting of J8, J12 and J-SUB cabinets. It extends the frequency response of a J-Series system down to 27 Hz and can only be used in ground stacked configurations in conventional left/right set-ups, as well as arranged in an infra subwoofer array. It has two bass-reflex chambers containing three 21" drivers, two facing forward in one chamber that are driven from one channel of the d&b amplifier and one facing backwards driven by another amplifier channel. Through this driver set-up its cardioid dispersion pattern avoids unwanted energy behind the system and greatly reduces the reverberant field at low frequencies, providing highest accuracy in low frequency reproduction. Selecting Hypercardioid mode in the amplifier optimises the tuning of front and rear channels for a maximum rejection at the left and right sides behind the cabinet. The J-INFRA cabinet is constructed from marine plywood and has an impact and weather protected PCP (Polyurea Cabinet Protection) finish. The front and rear of the loudspeaker cabinet are protected by a rigid metal grill and the side panels incorporate eight handles. The cabinet front is fitted with four catches for securing an optional wooden lid.

    Amplifiers

    The d&b D80 amplifier is recommended to drive the J-INFRA. The d&b 30D can also be used. The 2-Way active mode for the J-INFRA requires two channels of the D80.

    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)
    27 Hz - 60 Hz
    Max. sound pressure (1m, free field)1
    with 30D
    with D80

    141 dB
    144 dB
    Frequency response (–5 dB 70 Hz mode)
    27 Hz - 70 Hz
    Cabinets per D80 (2-Way Active)
    2
    Loudspeaker data
    Configuration
    Large format cardioid subwoofer
    Nominal impedance
    3 Ω (front) / 6 Ω (rear)
    Power handling capacity front (RMS/peak 10 ms)
    1200/4800 W
    Power handling capacity rear (RMS/peak 10 ms)
    600/2400 W
    Components
    3 x 21" driver
    Connections
    1 x NLT4 F
    optional 1 x EP5 or 1 x NL8
    Dimensions / weight
    Dimensions (H x W x D)
    685 x 1180 x 10402 / 1158 mm
    27.0 x 46.5 x 41.03 / 45.6"
    Weight
    152 kg
    335 lb

    1 SPL max peak test signal: pink noise with crest factor 4
    2 dimensions without wheels

    Application information is presented for guidance only. d&b reserves the right to make any necessary changes to the products and the published specifications. As part of the ongoing development program d&b tries to maintain the highest degree of product compatibility.

     
    Release
    Category
    File type
    Size
    Language
     
    TI385 d&b Line array design 10.2
    11.10.2018
    Technical information
    PDF
    4 MB
    English
    The J-Series brochure
    12.06.2018
    Brochures
    PDF
    7 MB
    English
    3D CAD drawings - J-INFRA
    11.05.2018
    CAD Data 2D/3D
    ZIP
    1 MB
    2D CAD drawings - J-INFRA
    09.05.2018
    CAD Data 2D/3D
    ZIP
    139 KB
    EU Declaration of Conformity (CE)
    06.03.2018
    Other documentation
    PDF
    53 KB
    English
    J-INFRA Manual 2.2
    29.07.2017
    Manuals
    PDF
    716 KB
    English
    J-Series cables and adapters
    30.01.2014
    Brochures
    PDF
    830 KB
    English
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