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Lowell CT830A-T870

Save $11.56
LowellSKU: CT830A-T870

Sale price$84.76 Regular price$96.32



Speaker Driver #CT830A-T870 (8? 20W coax, xfmr)

High performance 8" 20W coaxial speaker with mounted 70V transformer for quality paging and background music.


Background music and paging


• Driver:  8 in. 20W coaxial. High frequency speaker with first order high pass filter, ceramic magnets (12 oz. LF, 2.1 oz. HF) and permanently aligned voice coils.

• Frame:  20-gauge stamped steel with zinc-plated finish.

• Mounting Bolt Circle:  7.625 in.

• Transformer:  70V with taps at 1, 2, 4, 8W

• Assembly Mounting Depth:  3.30 in.

• Assembly Dispersion Angle:  80 degrees conical

• Assembly Frequency Response:  53Hz–14.3kHz (±6dB) and 44Hz–20kHz (±7.1dB)

• Assembly Average Sensitivity:  97.1dB


• Made in U.S.A. with global components

• Meets or exceeds industry standards



The 8 inch speaker with mounted transformer shall be Lowell Model No. CT830A-T870 which shall be of the coaxial type having electrically independent high and low frequency transducers and power rating of 20 watts RMS. The low frequency section shall have an 8 in. diameter cone; the high frequency section shall have a 3 in. diameter cone. A built-in electrical crossover network shall be employed to accomplish proper frequency selection between the two drivers. Crossover frequency shall be at 4000Hz. The low frequency voice coil shall have a 1 in. diameter and operate in a magnetic field derived from a strontium ferrite (ceramic) magnet with nominal weight of 12 oz. The high frequency voice coil shall have a 0.57 in. diameter  and operate in a magnetic field derived from a strontium ferrite ceramic magnet with nominal weight of 2.1 oz. Voice coil impedance shall be 8ohms. The speaker shall have a structurally reinforced, stamped 20-gauge steel frame with 8.062" overall dia. and eight obround holes equally spaced at 45 degrees on a 7.625 in. diameter mounting bolt circle. External metal parts shall be zinc-plated to resist rust and corrosion. The speaker shall have a mounted transformer with primary taps at 1, 2, 4, 8W @70V.The assembly shall be capable of producing a uniform audible frequency response over the range 53Hz-14.3kHz (±6dB) and 44Hz-20kHz (±7.1dB) with dispersion angle of 80 degrees @2000Hz (-6dB).Average sensitivity shall measure 97.1dB (SPL at 1W/1M). Assembly mounting depth shall not exceed 3.3 in.

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