21” (530mm), Very High Output, Horn-loaded, Subwoofer System

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  • The SW121HLP subwoofer is designed to deliver high-quality low frequency reproduction where very high output is a key requirement, together with well defined and deep basses and fast transient response.

    The SW121HLP is a high-performance subwoofer with a special configuration based on a small cavity behind the speaker and a very compact horn. With this special design and a particular digital processing, the SW121HLA can be used as an infra-sub and it can provide an impressive low-frequency extension and a “punchy” feeling in the upper bass range.

    The SW121HLP is equipped with a 21” (533mm) transducer capable of long excursion (up to 70mm peak-to-peak) and controlled by a Double Silicon Spider. The robust copper 135mm (5.3”) voice coil is wounded in four different layers both outside and inside the coil support, then improving the long term thermal capacity of the loudspeaker. Cones are made in cellulose with a special carbon fiber treatment to increase resistance and durability.

    • Very High Output
    • Compact size for a very good output-to-weight ratio
    • Horn-loaded configuration
    • High-strength, water repellent cone
    System’s Acoustic Principle Horn-Loaded Subwoofer
    Frequency Response (±3dB) 34 Hz  –  80 Hz    (Processed)
    Frequency Range (±10dB) 28 Hz  –  321 Hz    (Unprocessed)
    Nominal Impedance 8 Ω
    Minimum Impedance 5.6 Ω @ 43 Hz
    Sensitivity (1.41V @ 1m, 2Pi) 104dB
    Maximum Peak SPL @ 1m 145 dB 
    Type Single Neodymium 21” (530mm), 5.3” (135mm) VC 
    Cone Carbon fiber reinforced treated cellulose cone
    Voice Coil Type Split winding four layers ISV copper coil
    Suspension Triple Silicon Spider
    Connector Type Neutrik® Speakon® NL4 x 2
    Input wiring  Pin 1+/- = LF; Pin 2+/- = NC
    Continuous AES Pink Noise Power 1800W
    Program Power 3600W
    Peak Power 8000W
    Power Compression  
    @ -10dB (180W + 180W) 0.7dB
    @ -3dB (900W + 900W) 1.5dB
    @ 0dB (1800W + 1800W) 2.2dB
    Physical Dimensions  
    Width 589 mm (23.18”)
    Height 801 mm (31.53”)
    Depth 1022 mm (40.23”)
    Enclosure Material 15mm, reinforced phenolic birch
    Paint High resistance, water based paint
    Wheels 4 heavy-load 100 mm ø
    Net Weight 72 Kg (158.70 lbs.) - without wheels
    EASE_Focus_v3_1_11 AXIOM GLL.zipEASE Focus 3 Software & Models
    AX2010P_SW121HLP_v1_2.zipPresets for PC260
    AXIOM_SW121HL_v1_0.zipEASE Focus 3 models
    Data Sheet
    SW121HLP_data sheet_2017.pdfTechnical Data Sheet
    Technical Drawing
    SW121HLA_2D.dwgTechnical Drawing