4.5" 2-way, 100° conical


  • 4.5" polypropylene cone woofer.
  • 0.75" titanium dome tweeter
  • 40 watt continuous power handling, 160 watt peak
  • 70/100 V multitap transformer with 8 ohm bypass
  • C-ring and tile rails included

Package Includes:

  • Two AD-C42T loudspeakers
  • Two C-ring and tile rails
  • Two round grilles (white, paintable)
  • Two paint masks
  • Two connector assemblies
Configuration Compact 2-way, sealed enclosure

4.5" (10 cm) weather resistant, polypropylene cone woofer
0.75" titanium dome tweeter
Frequency Range 1
Frequency Response (-6 dB)
Useable Frequency Range (-10 dB)

72 Hz - 20 kHz
60 Hz - 20 kHz
Maximum Output 2
Calculated Peak Output
Calculated Continuous Output

110 dB SPL
104 dB SPL
Nominal Impedance 8 ohms switchable
Power Rating
Continuous power handling3
Recommended amplifier power (loudspeaker "program" power)

40 W (100 hours IEC)
80 W
Sensitivity 88 dB, 2.83 V, 1 m, free space (4 pi)


Type Custom low distortion laminated core, wide bandwidth design
Taps 70 V: 30, 15, 7.5, 3.8 W / 100 V: 30, 15, 7.5 W / 8 ohms selected by switch
Environmental Exceeds Mil Spec 810 for humidity, salt spray and dust;
IEC 60529 IP-X3 splash rating
Agency Rating Listed UL1480, UL2043 safe for use in air handling spaces;
Transformer is Listed UL1876; Compliant BS/EN 60849 safety standards


Material Injection molded, high impact polystyrene baffle on a steel enclosure
Finish White (paintable)
Grille Painted aluminum
Connectors Ceramic block or 4-pin Euro terminals in fire protective sub-chamber
Mounting Hardware Rails and C-ring for ceiling tile installation
Weight 6.1 lb (2.7 kg) Net
18 lb (8.2 kg) (pair) Shipping
Available Accessories AD-MR4 / AD-NC4

1All frequency ranges specified refer to measured free field response.
2Calculated SPL at 1m, (free space, 4 pi), speaker operating at rated RMS power with pink noise within specified frequency range
3Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor

Specifications are subject to change without notice.