QSC ADC-42-T Brochure

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

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 high­impact 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.

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

Frequency Response (-6 dB) 72 Hz - 20 kHz

Useable Frequency Range (-10 dB) 60 Hz - 20 kHz

Maximum Output

Calculated Peak Output 110 dB SPL

Calculated Continuous Output 104 dB SPL

Nominal Impedance 8 Ω

Power Rating er

RMS Power Handling

Recommended Max Amp Power 80 W RMS

Sensitivity 88 dB, 2.83 V, 1 m, free space (4π)

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;

Agency Rating Listed UL1480, UL2043 safe for use in air handling spaces;

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, 4π), 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.

1

2

3

er

er

40 W (100 hours IEC)

IEC 60529 IP-X3 splash rating

Transformer is Listed UL1876; Compliant BS/EN 60849 safety standards

AD-C42T

6.7"

171 mm

Side

8.9"

226 mm

.4"

9 mm

7.5"

191 mm

Front

Dimensions | Frequency Response

6.5"

165 mm

Side

Specifications subject to change without notice.

110

100

90

dBSPL

80

70

60

20 50 100 200 500 1K 2K Hz 5K 10k 20K

Frequency

QSC and the QSC logo are registered trademarks of QSC Audio Products Inc. in the U.S. Patent and Trademark office and other countries.
AcousticDesign is a trademark of QSC Audio Products, Inc. All other trademarks are the property of their respective owners.

1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: [phone]

AD-C42T Spec Sheet - 10/11/07

qscaudio.com