Lowell WB8-8A50-T870
8" 50W Coaxial Speaker with 70V Transformer and Grille Assembly

OUR PART #  WB8-8A50-T870

Lowell's WB8-8A50-T870 8" speaker assembly provides high-quality music or paging in mid- to large-sized venues (hotel lobbies, restaurants, department stores and similar applications). This assembly includes a grille and 70V transformer.

Model 8A50 is a 50W coaxial speaker, an upgrade in performance over standard commercial coaxial drivers—with greater power handling, lower distortion, and smoother musical sound. The 8A50 is engineered to meet the demand for very high quality music reproduction and paging in large venues such as upscale restaurants, lounges, hotel lobbies, retail stores and similar locations where the listening experience is a key part of customer satisfaction. The 20 oz. LF magnet coupled with 1.4" copper voice coil drive a polyproylene cone with half-roll rubber surround for long cone travel and good edge damping. Post-mounted tweeter is a 1" balanced-drive dome protected by Ferrofluid and a first-order high-pass filter. Speaker frame is 20-ga. steel with black enamel finish and zinc-plated back plate.


  • General signaling
  • 8" 50W coaxial speaker (no. 8A50)
  • Line matching transformer with primary taps at 1, 2, 4, 8W @ 70V. Secondary impedance taps at 8/4 ohms. (no. TLM-870)
  • Round, screw-mount steel grille with white finish (no. WB8)
  • Made in USA with domestic and imported parts.

NOTE: Requires Backbox ULXCP87 (Sold Separately): To maintain UL-Listing, the assembly must be used with the approved (UL-Listed) backbox listed on the spec sheet, found in the document tab above.



  • Power Handling 50 watts RMS (nominal) measured per EIA Standard RS-426A (70W in a 1/2 cu.ft. backbox)
  • Sensitivity |90dB log average SPL (1W/1M) 107dB maximum SPL (calculated based on power rating and measured sensitivity)
  • Impedance 8 ohms (nominal), 8 ohms @180Hz (minimum)
  • Frequency Response 40Hz-20kHz (nominal), 40Hz-20kHz (+6dB)
  • Crossover Frequency 4000Hz, 1st order high-pass filter
  • Dispersion Angle 110° @ 2000Hz octave (-6dB)


  • Cone Material Polypropylene with rubber half-roll (up) surround
  • Magnet Weight, Material 20oz. (567g), strontium ferrite ceramic
  • Voice Coil Diameter, Material 1.4" (36mm), copper wire over aluminum former
  • Terminals Quick disconnect type - spade lugs


  • Diameter 2.05" (52mm) housing with 1" (26mm) Dia. balanced-drive dome
  • Magnet Weight, Material 2oz. (57g), ceramic
  • Voice Coil Diameter, Material 0.53" (13.5mm), copper wire and ferrofluid


  • Basket 20 gauge stamped steel with black enamel finish
  • Outside Diameter 8.08" (205mm)
  • Mounting Bolt Circle 7.625" (195mm) with 8 obround holes equally spaced at 45 degrees.
  • Cutout Diameter 7.2" (182mm)
  • Mounting Depth-Driver 3.85" (94mm)
  • Mounting Depth-Driver/xfmr 6.25" (159mm)
  • Net Weight-Driver 3.5 lbs. (1.6kg)
  • Net Weight-Driver/xfmr/grille 4.6 lbs. (2.09kg)
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