SB ACOUSTICS 4
SB ACOUSTICS 4
SB ACOUSTICS 4
SB ACOUSTICS 4
SB ACOUSTICS 4
SB ACOUSTICS 4

SB ACOUSTICS 4" MID-WOOFER - NRXF

    $89.50

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  • Order Code: SB12NRXF25-4
  • Availability: In Stock

    • PAPYRUS CONE FOAM SURROUND

  • Proprietary cone material made with natural fibres in-house. Foam surround for maximum transparency and midrange resolution. Vented pole piece for reduced compression. Vented cast aluminium chassis for optimum strength and low compression. CCAW voice coil for reduced moving mass. Long life silver lead wires. Non-conducting fibre glass coil former.

    • The goal of SB Acoustics with their NRX series of performance drivers has been to design a simple, yet optimised speaker driver at a competitive price to achieve a high performance to cost ratio for their customers who appreciate premium quality audio. To this end, SBA are proud to present their NRX series: Close attention to design engineering with manufacturing materials and processes to optimize performance. The coil former material is fibre glass. It is fundamental to use a non-conducting former material to ensure a low mechanical loss and high Qms. We prefer the damping to be electrical rather than mechanical, as this puts the amplifier in control. This is important if you want the driver to accurately reproduce the electrical signal. The woofers feature large diameter copper wire voice coils for improved power handling and allows for efficient ventilation through the centre pole. The basket is also vented under the spider to reduce compression to an absolute minimum, which is necessary to ensure good dynamics. The motor structure is simple, but all dimension have been optimizes to ensure BL symmetry and good saturation of the iron in the coil region. The surrounds are low damping SBR with a low shore hardness, which ensures good linearity. Stability is obtained by making the rolls just thick enough to withstand the high pressure in smaller cabinets without “collapsing”. The geometry of the surround and spider start limiting at the same time with a linear region slightly exceeding that of the coil overhang. This all ensures good linearity without hard clipping or mechanical damage to the cone at high levels. The cone material is made in-house using a proprietary blended hard stiff natural materials we call NOREX®. Cone stiffness is important to a woofer, as it should behave like a piston that moves air without flexing. This clearly improves bass reproduction. The baskets are cast aluminium to insure a rigid open structure. This makes the optimum foundation for the moving parts and has been designed not only to look good but also to offer some unique mounting options. They even come with gaskets pre-mounted. The design considerations have been the same for the mid-woofers. For the mid-woofers we have selected the cone material we found to have the most natural sound character. For each of the mid-woofers, we have carefully chosen the cone weight, as this is also a very important parameter in the pursuit of a natural and balanced sound character. The 5” and 6.5” mid-woofers use an extended copper cap on the pole piece, which controls variations in voice coil inductance, thereby lowering modulation distortion in the important midrange area. The copper cap also reduces the inductance. This results is increased bandwidth and improved transient response.
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    SB ACOUSTICS 4

    Found in Category : DELETE

    Product Specs for SB ACOUSTICS 4" MID-WOOFER - NRXF

    Type Mid-Woofer
    Size 4"
    Price Type each
    Power 30Wrms
    Coil 25.4mmØ
    Width 123mmØ
    QTY 1
    Impedance 4Ω (Re 3.1Ω)
    Depth 61mm
    Mag. 0.32kg
    Sens. 87dB
    Re 3.1Ω
    Qms 5.3
    Qes 0.53
    Qts 0.48
    Vas 4.1L
    Sd 50cm²
    Cms 1.17mm/N
    Fs 61Hz
    Mms 5.8g
    Zn 4Ω
    Le 0.27mH
    Rms 0.42kg/s
    Diam. 100mmØ
    Series Norex Cones
    Manufacturer SB Acoustics
    Materials Norex
    Impedance (Ohm) 4 ohm
    Power (RMS) 0-50 Watt
    Inch 4
    Bl 3.6Tm
    Xmax 10mm
    Flux (lm) 0.84T
    eBook

    Link to eBook
    Wagner eBook 03-168
    Page 23
    Prms 30W
    DescriptionFileSize
    Datasheet SB12NRXF25-4.pdf 838 KB
    SB Acoustics Catalogue SB-Acoustics-Catalogue.pdf 26130 KB

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