AD-C42T
AcousticDesign™ Ceiling Mount Speaker
The AcousticDesign Series of installation loudspeaker
products from QSC Audio expands with the new
AD-C42T ceiling mount loudspeaker system. Designed
for background and general purpose audio playback,
the new AD-C42T is compact and acoustically matched
to the entire AD Series. Rated for 40 Watts continuous
power handling and able to take up to 160 Watt
peaks, the compact AD-C42T is suitable for a wide
variety of ceiling installations
The 4" woofer is equipped with a polypropylene
cone for protection in humid environments. The
driver features a synthetic rubber surround and in its
sealed enclosure is optimized to deliver useable low
frequency extension below 70 Hz. The high frequency
device is a co-axial, post mounted 0.75" dome tweeter
with a titanium diaphragm and a cloth surround. The
coaxial post is mounted slightly off center in relation
to the low frequency driver in order to lessen the
destructive interference often found with axisymmetric
post mounted coaxial systems. The conical dispersion
of the AD-C42T is 100° and sensitivity measures
88 dB SPL.
The baffle and mounting tabs are molded from high-
impact polystyrene. The rear enclosure is a heavy
gauge, powder coated steel. The attractive aluminum
grille is backed with an acoustically transparent white
cloth. On the rear of the enclosure is an input cup
that features a conduit attachment point plus an
additional knockout for daisy-chain wiring. Input signal
connection is made with a high temperature resistant
ceramic screw terminal for compliance with European
safety standards.
The AD-C42T is factory shipped with C-rings and tile
rails for installation. New construction rings (ADC-NC4)
and mud rings (ADC-MR4) are also available separately.
The AD-C42T is equipped with a 70/100 V transformer
with multiple taps and an 8 ohm bypass.
Features
• 4" 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
Specifications
Configuration
Compact 2-way, sealed enclosure
Transducers
er
Low-frequency
4" (10 cm) weather resistant, polypropylene cone woofer
High-frequency
0.75" titanium dome tweeter
Frequency Range
1
er
Frequency Response (-6 dB)
72 Hz - 20 kHz
Useable Frequency Range (-10 dB)
60 Hz - 20 kHz
Maximum Output
2
er
Calculated Peak Output
110 dB SPL
Calculated Continuous Output
104 dB SPL
Nominal Impedance
8
Ω
Power Rating
er
RMS Power Handling
3
40 W (100 hours IEC)
Recommended Max Amp Power
80 W RMS
Sensitivity
88 dB, 2.83 V, 1 m, free space (4
π
)
Transformers
er
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
Ω
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
Enclosure
er
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 - Net / Shipping (pair)
6.1 lb (2.7 kg) / 18 lb (8.2 kg)
Available Accessories
ADC-MR4 / ADC-NC4
1) All frequency ranges specified refer to measured free field response.
2) Calculated SPL at 1m, (free space, 4
π
), speaker operating at rated RMS power with pink noise within specified frequency range
3) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor.
