4.5" small format, ceiling mount
loudspeaker
Restaurant ∙ Retail ∙ Audio Visual ∙ Education ∙ Concourses ∙ Casinos ∙
Transportation Terminals ∙ Worship Facilities ∙ Large System Ancillary Support
AD-C4T
EN54-24 Listed
AcousticDesign™ Series
AD-C4T-WH
AD-C4T-BK
Features
• Consistent tonal characteristics
across the entire AcousticDesign
Series for surface, ceiling, and
pendant applications
• DMT (Directivity Matched
Transition™) waveguide ensures
smooth, uniform frequency
response over the coverage area
• Snap-fit magnetic grille
• 3x double stepped, long travel
dog-ear blind mount system
• Intrinsic Correction™ voicings
available via the Q-SYS Platform
including CXD amplifiers
• Low-saturation and low-loss
70/100V transformers with 16Ω
bypass
• Blemish-free removable logo
• Removable conduit cover plate,
also available as accessory for
pre-install wiring
• UL1480 and UL2043 certified
EN54-24 Type A, 0359-CPR-00623
• Available in black (RAL 9011) or
white (RAL 9010)
• Complete EASE, CF2, CAD, &
BIM information available online
The QSC AcousticDesign™ AD-C4T is a
4.5" two-way ceiling loudspeaker ideally
suited for a wide variety of foreground and
background sound reinforcement
applications which utilize 70/100V or 16Ω
bypass configurations.
The AcousticDesign™ Series offers
integrators a premium quality installed
sound solution where performance,
consistent coverage, and aesthetics are
paramount. Specifically designed to
maintain a consistent tonal characteristic
across the entire family in ceiling, surface,
and pendant applications, the
AcousticDesign Series allows integrators
seamless transitions within blended
installations.
The AD-C4T features a high quality 4.5"
weather treated paper cone woofer with a
1" voice coil and a .75" aluminum dome
tweeter which is positioned on a DMT
waveguide.
DMT (Directivity Matched Transition™) is
QSC’s design philosophy where the high
frequency waveguide is matched to the
natural conical behavior of the woofer at the
crossover point. The result is a coherent
transition between transducers with
improved off-axis power response for
consistent 150° conical DMT coverage.
The accurate frequency response of the
AD-C4T is maintained even in 70/100V
applications by use of a low-loss, lowsaturation 30-watt transformer with
selectable taps, including 16Ω bypass,
using a rotary selector located under the
snap-fit magnetically attached powder coat
steel grille.
To retain lasting good looks, the rugged
ABS baffle is further protected by using UV
inhibitors that prevent discoloration and by
a powder coated steel back can. The
magnetic grille features a stick-on logo that
can be removed blemish-free for
installations where branding is not
permitted.
Installers will appreciate the 3x double
stepped, long travel dog-ear blind mounting
system, which captures from 0" - 2.25" of
ceiling thickness. The conduit cover plate
can be easily removed by losening the
single captive Phillips screw allowing access
to the locking 4-pole Euro-block connector
which can accept up to four 18AWG pairs,
eliminating the hassles of star topology
wiring designs.
Intrinsic Correction™ voicings that optimize
performance and speed the install process
are easily deployed via the Q-SYS Platform
including CXD-Q Series amplifiers, as part
of a complete QSC systems solution.
The AD-C4T is available in QSC standard
black (RAL 9011) or white (RAL 9010) and
may be painted to match any decor.
For your system integration needs,
complete EASE, CF2, CAD, and BIM files
are available for download at QSC.com.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174 please recycle
© 2017 QSC, LLC all rights reserved. QSC and the QSC logo are registered trademarks of QSC, LLC in the U.S. Patent and Trademark office and other
countries. All other trademarks are the property of their respective owners. Patents may apply or be pending.
AD-C4T Spec Sheet 07/25/2017
AD-C4T-BK, AD-C4T-WH Details
Impedance / Frequency Response:
As part of QSC’s ongoing commitment to product development,
specifications are subject to change without notice.
[7.48 in]
190 mm
[9.06 in]
230 mm
[6.74 in]
171 mm
[6.94 in]
176 mm
Specifications
System Details AD-C4T-BK, AD-C4T-WH
LF transducer 110 mm [4.5 in] weather treated paper cone woofer
HF transducer 19 mm [.75 in] aluminum dome tweeter
Effective frequency range 1, 2, 3, 8 70 Hz – 20 kHz
Rated noise power / voltage 6 30 watts / 22 volts (rms)
Sensitivity [dB] Rated @1W, 1m 2, 3, 4, 8 : 87
EN54-24 @1W, 4m 9 : 73
Coverage (‐6 dB) [°]
Horizontal / Vertical 9
Rated 2, 5, 8 : 150 conical DMT
500Hz: 176 / 176, 1kHz: 160 / 160
2kHz: 156 / 152, 4kHz: 103 / 111
Declared values of SPL, 1/3rd
octave band CPB, 1W, 4m,
EN54-24 eq applied [Hz : dB]9
500: 59.1; 630: 59.4; 800: 60.0; 1000: 60.0
1250: 61.0; 1600: 60.5; 2000: 62.3; 2500: 61.0
3150: 58.0; 4000: 62.2
EN54-24 Equalization 9 High Pass, 24dB/oct, Butterworth, Fc: 70Hz
Low Shelf, 12dB/oct, (Q)1.2 / (BW)1.17, Fc: 340Hz, Gain: -5dB
High Shelf, 12dB/oct, (Q)0.8 / (BW)1.70, Fc: 6kHz, Gain: +5dB
Directivity factor 2, 5, 8 4.5
Directivity index [dB] 2, 5, 8 6.5
Maximum SPL [dB] Rated, 1m (continuous / peak) 7 : 102 / 108
EN54-24, 4m (low-Z / Highest-tap) 9 : 85.51 / 86.52
Recommended amplifier 60 watts
Transformer taps / impedance Bypass:16Ω
3.75W (70V); 7.5W (100V) Tap: 1333Ω
7.5W (70V); 15W (100V) Tap: 667Ω
15W (70V); 30W (100V) Tap: 333Ω
30W (70V); N/A (100V) Tap: 167Ω
Input connector type Euroblock connector with parallel output
Enclosure material ABS baffle on powder coated steel back can
Grille material Powder coated steel
Ingress protection IP-34
Operating environment Designed for indoor use
Operating temperature range -20 to 50° C [-4 to 122° F]
Cutout dimension Ø 195 mm [Ø 7.68 in]
Net weight 2.9 kg [6.4 lb]
Product dimensions (Ø x H) Ø 230 x 176 mm [Ø 9.06 x 6.94 in.]
Shipping weight 9.3 kg [20.5 lb] (pair packed)
Shipping dimensions (H x W x D) 279 x 711 x 318 mm [11 x 28 x 12.5 in] (pair packed)
Included accessories C-ring and tile rails, rail screws, euroblock connector, cut-out
template, grille
Optional accessories AD-MR4 (pre-install mud ring)
Safety Agency EN54-24: 2008 type A, 0359-CPR-00623
UL1480, UL2043, NFPA90, NFPA70 suitable for use in air
handling spaces. Transformer UL registered per UL1876,
ROHS, CE compliant. Baffle meets UL94-V0 and UL94-5VB
flamibility rating; in accordance with IEC60849 / EN60849
systems.
1
-10dB from rated sensitivity
2
Full-space, IEC baffle, 4m
3
Reference axis
4
200 - 10kHz average
5
500 - 5kHz average
6
IEC, 2hrs
7
Calculated from rated noise power and sensitivity
8 Reference plane is the plane coincident with the loudspeaker baffle plane. Reference axis is the axis perpendicular to
the reference plane and passing through the center of the baffle. Vertical plane is the plane intersecting the reference
plane at a right angle, including the reference axis and the taps selector knob. Horizontal plane is the plane intersecting
the reference plane and the vertical plane at a right angle, including the reference axis.
9
Per EN54-24
1k 10k
100
Frequency (Hz)
Beamwidth (-6 dB) (deg)
200 500 2k 5k 20k
200
70
50
30
20
Beamwidth: