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Lowell Manufacturing WB4T-4A30-T870 Speaker/Grille Assembly, Includes 4" 30W Coaxial Driver, 8W Transformer and White Torsion Grille

SKU: LW4T4A30T870 MFR: WB4T-4A30-T870
$117.92
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Key Features

  • Experience superior sound quality with this 4" coaxial commercial speaker system.
  • Achieve optimal audio in any space with the 8W transformer's versatile power taps.
  • Enjoy broad sound dispersion with a 135-degree angle, perfect for announcements.
  • Durable steel torsion grille in white seamlessly blends with any ceiling aesthetic.
  • Easy installation with quick-connect terminals simplifies your audio setup process.
  • Benefit from a wide frequency response, delivering crystal-clear audio from 50Hz-20kHz.
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Special Order?Estimated to Ship: 08/22/2025
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Lowell Manufacturing WB4T-4A30-T870 Specifications

Driver
  • Power Rating

    30 watts (EIA 426B)

  • Sensitivity

    87.8dB SPL (avg) measured 2.83V at 1m
    Max SPL 102.6dB (calculated value based on power rating and measured sensitivity)

  • Impedance

    8 ohms (nominal), minimum 6.4 ohms at 508Hz

  • Frequency Response

    81Hz-20kHz (+6dB); 50Hz-20kHz (+8.1dB)

  • Crossover Frequency

    5000Hz, 1st order high-pass filter

  • Dispersion Angle

    135 degrees at 2000Hz octave (-6dB)

  • Woofer Cone Material

    Polypropylene with rubber half-roll (up) surround

  • Woofer Magnet Weight

    10 oz (283.49g)
    Material: Ferrite ceramic

  • Woofer Voice Coil Diameter

    1" (2.54cm)
    Material: Copper wire over aluminum former

  • Woofer Terminals

    Quick connect type - two 0.187" spade lugs (push terminals)

  • Tweeter Diameter

    1.75" (4.45cm) housing with 1" (26mm) Dia. balanced-drive dome

  • Tweeter Magnet Weight

    0.06 oz (1.70g)
    Material: neodymium magnet

  • Tweeter Voice Coil Diameter

    0.5" (1.27cm)
    Material: liquid cooled copper wire

  • Basket

    20-gauge stamped steel with black enamel paint

  • Outside Diameter

    5.03" (12.78cm)

  • Mounting Bolt Circle

    4.69" (11.91cm) with 4 obround holes spaced at 90 degrees and 4 round holes spaced at 90 degrees

  • Cutout Diameter

    4.13" (10.49cm)

  • Mounting Depth

    2.25" (5.72cm)

Transformer

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  • Primary Voltage

    70V

  • Power Rating

    8W

  • Primary Taps

    1, 2, 4, 8W

  • Secondary Impedance

    8, 4 ohms

  • Frequency Response

    50Hz-15kHz (+/-1dB)

  • Lead Length

    8" (20.32cm)

  • Leads

    Color-coded

  • Style

    Torsion

  • Material

    20-gauge steel outer ring with punched center, contoured edge

  • Finish

    White

  • Size

    7.25" (18.42cm) diameter

  • Mounting Projection

    0.25" (0.64cm)

  • Mounting Provisions

    Torsion bracket spring devices accommodate a variety of ceiling depths, welded studs with nuts

General

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  • Dimensions

    Transformer: 2.38 x 2.88 x 1.68" (6.05 x 7.32 x 4.27cm)

  • Weight

    Driver: 1.75 lbs (0.79kg)

About Lowell Manufacturing WB4T-4A30-T870

Bring superior sound quality to your space with the WB4T-4A30-T870 Speaker/Grille Assembly. This high-quality audio equipment, crafted by the reputable Lowell Manufacturing, includes a 4" 30W coaxial driver, an 8W transformer, and a stylish white torsion grille.

Designed for in-ceiling installation, this speaker assembly offers a discreet and aesthetically pleasing solution for your audio needs. It's perfect for enhancing the ambiance in hotel lobbies, retail stores, transportation terminals, and other similar venues with its high-quality paging and background music reproduction capabilities.

The 4" 30W coaxial driver delivers a wide 135-degree sound dispersion, ensuring large coverage areas with uniform response and clear audibility. It features a ten oz. magnet and a 1" copper voice coil driving a polypropylene cone with a half-roll rubber surround, ensuring long cone travel and excellent edge damping. The post-mounted, liquid-cooled tweeter is a 1" dia. balanced drive dome with a first-order highpass filter, providing a frequency response of 70Hz-20kHz (+6dB) and 50Hz-20kHz (+8.8dB) with a crossover at 5kHz.

The 8W transformer, with primary taps at 8, 4, 2, 1 watt, offers a frequency response of 50Hz-15kHz (+1dB). It's ideal for high-quality audio systems and general-purpose paging applications where wide frequency response, low insertion loss, and high power handling are critical. The transformer features an industry-standard open-housing design and color-coded leads for quick and easy installation.

The white torsion grille, designed for use with a 4-inch speaker, adds a sleek touch to your space. It's made from durable steel with a low projection and contoured edge, ensuring a seamless fit with your ceiling.

This speaker/grille assembly is made in the U.S.A. with global components and is UL1480 listed for general signaling and UL2043 rated for use in plenum space when used with an approved backbox. Choose the WB4T-4A30-T870 Speaker/Grille Assembly for a reliable, efficient, and stylish audio solution.

Lowell Manufacturing WB4T-4A30-T870 Features

  • High-quality 4" 30W coaxial driver for superior sound reproduction
  • Efficient 8W transformer with wide frequency response for high-quality audio systems
  • Stylish white torsion grille made from durable steel, designed for in-ceiling installation
  • Wide 135-degree sound dispersion for large coverage areas
  • Post-mounted, liquid-cooled tweeter for clear, balanced sound
  • Made in the U.S.A. with global components, UL1480 listed & UL2043 rated for safety & reliability

Warranty Information

This product has a limited warranty of 12 months.

Key Features

  • Experience superior sound quality with this 4" coaxial commercial speaker system.
  • Achieve optimal audio in any space with the 8W transformer's versatile power taps.
  • Enjoy broad sound dispersion with a 135-degree angle, perfect for announcements.
  • Durable steel torsion grille in white seamlessly blends with any ceiling aesthetic.
  • Easy installation with quick-connect terminals simplifies your audio setup process.
  • Benefit from a wide frequency response, delivering crystal-clear audio from 50Hz-20kHz.

What's in the box:

  • Lowell Manufacturing 4A30 4 " 30W Coaxial Driver
  • TLM-870 8W Transformer
  • WB-4T Torsion Grille (White)
  • Lowell Manufacturing 1 Year Limited Warranty