Specifications
55
AD-C81Tw
The AD-C81Tw ceiling mount subwoofer supplements
AcousticDesign systems with low frequency extension
that is acoustically ideal for both ceiling-mount and
surface mount models. Rated for 100 W continuous
(400 W peak) power handling, the AD-C81Tw extends
low-frequency output below 40 Hz and has a 120 Hz
low-pass filter that is switchable from the front panel.
For maximum flexibility, the AD-C42T incorporates a
70/100 volt transformer with multiple taps plus an 8Ω
bypass for low impedance operation.
The unit’s 8" woofer features a polypropylene cone
with synthetic rubber surround. The driver works with
the large port to provide solid low-frequency extension
without undesirable port turbulence. This highly
efficient design offers 92dB (1 W/1 m) sensitivity.
The baffle and mounting tabs are molded from high-
impact polystyrene while the enclosure is constructed
from heavy gauge powder coated steel. For minimum
vertical clearance, the input cup is on the side of the
enclosure:itfeaturesaconduitattachmentpoint,
plus an additional knockout for daisy-chain wiring.
The high temperature-resistant ceramic input screw
terminal complies with European safety standards. The
AD-C81Tw’s fascia features an attractive aluminum
grille backed with acoustically transparent cloth.
The AD-C81Tw ships complete with C-rings and tile
rails; new construction rings (ADC-NCS) and mud
rings (ADC-MRS) are available as options.
LOUDSPEAKERS
EASE Address Software
This is free software that may be
downloaded from the support section of
the QSC website
EASE Address is a software that allows the
modeling of acoustic sources, in particular
distributed loudspeaker systems, in two
dimensions. It allows the system designer
to quickly develop a simple design for
a ceiling loudspeaker system, while also
allowing the easy and quick prediction of
the system performance in a given hall.
RoHS
AD-C42T AD-CI52T AD-CI52ST AD-C81Tw
System Type
2-way, ceiling / flush
mounted,
sealed system
2-way, ceiling / flush
mounted,
ported system
Shallow can, 2-way,
ceiling / flush mounted,
ported system
Subwoofer,
ceiling / flush mounted,
ported system
Frequency Range
(-10 dB)
60 Hz – 20 kHz 65 Hz – 20 kHz 53 Hz – 20 kHz 28 Hz – 208 Hz
Frequency
Response
(±3 dB)
72 Hz – 20 kHz 85 Hz – 20 kHz 63 Hz – 20 kHz 39 Hz – 184 Hz
Nominal Coverage 100° conical 90° conical 100° conical N/A
Full Range
Power
Capacity
1
Sensitivity
2
Peak SPL
3
40 W (100 hrs)
88 dB
110 dB
40 W (100 hrs)
86 dB
108 dB
40 W (100 hrs)
87.5 dB
109 dB
100 W (100 hrs)
92 dB
118 dB
Driver Information
LF
4" weather resistant,
polypropelene cone
woofer
5.25" weather resistant,
low distortion fiberglass
cone woofer,
25 mm voice coil,
neodymium magnet
5.25" weather resistant,
low distortion fiberglass
cone woofer,
25 mm voice coil,
neodymium magnet
8" weather resistant,
polypropelene cone
woofer,
rubber surround
HF
0.75" titanium dome
tweeter,
rubber surround
1" titanium dome
tweeter,
rubber surround
1" titanium dome
tweeter,
rubber surround
N/A
Controls /
Selectors
70 V: 30, 15, 7.5, 3.8 W
100 V: 30, 15, 7.5 W
8Ω Externally
Selectable
70 V: 30, 15, 7.5, 3.8 W
100 V: 30, 15, 7.5, 3.8 W
8Ω Externally
Selectable
70 V: 30, 15, 7.5, 3.8 W
100 V: 30, 15, 7.5, 3.8 W
8Ω Externally
Selectable
70 V: 60, 30, 15, 7.5 W
100 V: 60, 30, 15 W
8Ω Externally
Selectable
Input Connectors
Ceramic block or 4-pin
Euro terminals,
fire protective sub-
chamber
4-pin Euro terminals,
fire protective
sub-chamber
4-pin Euro terminals,
fire protective
sub-chamber
Ceramic block or 4-pin
Euro terminals,
fire protective
sub-chamber
Suspension /
Attachment Point
N/A N/A N/A N/A
Dimensions
(HWD) inches
7.5" x 7.5" x 9.3" 8.5" x 8.5" x 9.3" 12.6" x 12.6" x 3.75" 12.6" x 12.6" x 14.8"
Dimensions
(HWD) mm
191 mm x 191 mm x
236 mm
216 mm x 216 mm x
236 mm
321 mm x 321 mm x
95 mm
320 mm x 320 mm x
376 mm
Net Weight (each) 6.1 lb / 2.7 kg 7.5 lb / 3.4 kg 8 lb / 3.7 kg 20 lb / 9.1 kg
1 Continuous IEC specified test signal, 2 hours unless otherwise stated.
2 Based on nominal impedance, measured in full space. 1 W @ 1 m.
3 Calculated using specified power capacity and system sensitivity. 6 dB peak-to-average signal ratio assumed.