AcousticDesignTM In-ceiling Loudspeakers User Manual
AD-C81Tw
203 mm (8”) Subwoofer
*TD-000263-00*
TD-000264-00-B
Introduction
Congratulations and thank you for your ceiling loudspeaker purchase. The AD-C81Tw model offers
excellent acoustic performance in an easy-to-install and attractive package. Please review
these instructions carefully and follow the recommendations. Consult a licensed instal-
lation professional if you are uncertain about any mounting issues.
The AD-C81Tw models feature a 8” low frequency (LF) driver in a ported enclosed.
The AD-C81Tw is equipped with an audio transformer suitable for 70V and 100V dis-
tributed systems, as well as a tap-selector switch which can bypass the transformer
for 8 ohm applications. The AD-C81Tw also includes a bypassable 120Hz low pass filter.
What’s Included
Your ceiling loudspeaker box contains:
- the loudspeaker cabinet
- the protective grill assembly
- two support brackets for suspended ceiling installations
- C-ring bracket for suspended ceilings and other ceiling reinforcing applications
- Self-tapping screws(M4.2 X 1.4 X 10mm) for securing the C-ring-to-support brackets
- grill clip used for clipping the plastic grill retaining lines together
- phoenix connector assembly for connecting signal and daisy-chaining
- paint shield
- grille cloth
Installation Options
The AcousticDesign in-ceiling loudspeakers can be mounted in suspended ceilings, as well as non-suspended types. We recommend an
installation professional be consulted for safety assurance, quality installation, and optimum acoustic performance.
For suspended ceiling applications, the suspended ceiling support brackets must be used with the C-ring bracket. The suspended ceiling
support brackets are designed to accommodate 24” or 600 mm t-channel grid spacing. The brackets do not attach to the t-channel; the
angled “V” bend sits over the t-channel and will catch the t-channel in the event of a tile failure or fall-out.
For other ceiling types, the C-ring bracket can be used to reinforce the mounting surface. If the ceiling is suitably strong, the loud-
speaker can be secured in the cutout hole without additional reinforcement.
Audio connections are made directly to the ceramic teiminal block or by using terminal block type connectors. Two sets of terminals are
provided; one set for the signal connection and another for pass-through (or daisy chain) connection to other loudspeakers on the same
distribution circuit.
Two safety features are provided, an enclosure-retaining safety tab and a grill-retaining safety tether. The enclosure tab is a metal tab
near or on top of the enclosure suitable for securing the loudspeaker to building framing; this provides maximum safety in the event the
ceiling structure fails for any reason. The grill’s safety tether prevents the grill from failling in the event it should vibrate loose.
Existing Suspended
Ceiling “T-Bars”
Hardware Nomenclature
Suspended ceiling viewed from above.
(hardware may not be required for all installations)
Support Brackets
C-ring Bracket
Screws
Grill Safety Clip
Use the Secondary Support Tab!
The cabinet and the grill both have a small loop of
plastic line. The grill’s loop has a clip attached.
Using the grill clip, attach the grill to the cabinet’s
loop. This will help prevent the grill from falling
should it become detached.
Loudspeakers can potentially generate substantial vibra-
tion. In addition to ensuring all hardware is properly
installed and secured, you must use the secondary support
tab on the enclosure to secure the loudspeaker to an appro-
priate structural support. This will minimize the chance of
the loudspeaker falling from the ceiling in the event the pri-
mary mount fails. Any cable or wire used as a secondary
support line must be strong enough to support several times
the weight of the loudspeaker. Do not use rope, string,
twine or other textile-based line in the secondary support
system as it is easily cut or burned. The secondary support
attachment point and any fasteners used on the building’s
structure must also be strong enough to support several
times the weight of the loudspeaker.
Mounting Clamps
The mounting clamps are
part of the assembly for
simple use. Do not install
the grill until clamps have
been tightened and any
adjustments made.
Before inserting the cabi-
net into the mounting cut-
out, make sure the clamps
are folded in against the
cabinet, see 1, right.
After the cabinet is
installed into the mount-
ing cutout, tighten each
clamp’s screw using a #2
Phillips screwdriver, see 2,
right.
The clamp rotates 90° and
is then pulled tight by the
screw, see 3, right.
Connections
Connect signal wires either directly to ceramic terminal block noting correct polarity or to
the supplied plastic terminal block assembly. When using the plastic terminal assembly,
connect the four pin receptacle to the ceramic block observing polarity. Connect the signal
wires to the screw terminals of one of the two pin plugs observing correct polarity. The
other two pin plug can then be used as pass through to daisy chain the signal to another
speaker or it can be left unused.
Other Recommendations and Important Information
•Grill removal: The grill can be removed by carefully prying around its outer edge or inserting a small, metal pin or hook into the
grill’s openings and pulling evenly around its perimeter.
•If rattles or buzzing is heard during operation, it may be necessary to put vibration dampening material between the support
rails and the ceiling tiles and/or t-channels.
•The support rails have holes along their usable length to attach the C-ring bracket. This allows for the cutout to be placed in
many positions along the ceiling tile width.
Installation Procedure
1- Using the included C-ring or the dimensions provided, trace a cutout pattern onto
the ceiling surface.
2- Cut the mounting hole. Use a sharp tool to avoid stressing or cracking the mount-
ing surface.
3- Pull the wires through the hole.
4- Pass the two suspended ceiling support brackets through the hole and place as
shown in the illustration. Make sure the part of the bracket that is flat against the tile
is toward the hole. If installing in a non-suspended ceiling application, these brackets
are not required.
5- Pass the C-ring bracket through the hole. Slide the cutout slot into the hole first,
and then rotate the bracket so it passes through the hole. Be sure the wires pass
through the ring.
6- Position the support brackets, and secure the C-ring bracket to each of the support
brackets using the screws provided. If installing in a non-suspended ceiling applica-
tion, skip this step.
7- Loosen the connection cover plate retaining screw and swing the cover open.
Install an fitting into the hole provided on the cover plate.
8- Temporarily support the enclosure so the wires may be passed through the enclo-
sure top with enough slack to prepare and terminate the wires.
9- Locate the terminal block connectors included with the loudspeaker. Loosen the
wire retaining screws fully.
10- Strip the wire ends approximately 10 mm (0.4”) and insert each wire into its
proper connector position. Tighten the wire retaining screws fully.
11- Rotate the connection cover plate closed, making sure not to stress the connec-
tions or pinch the wires. Tighten the cover plate’s retaining screw.
12- Adjust the wiring at the entry point, if necessary, and properly secure fitting.
This prevents wire stress and strain from pulling the connections/connectors loose.
13- Attach a safety cable (secondary support cable) from the enclosure’s attachment
tab to an appropriate support point. This cable and the attachment points must be
strong enough to support many times the weight of the loudspeaker in the event the
primary mounting system fails.
14- Insert the enclosure into the ceiling cutout, making sure any brackets used
remain properly positioned. Tighten the loudspeaker’s mounting clamp screws.
15- Set the tap selector switch to the desired position. 70V systems, all four posi-
tions may be used. Do not use highest tap setting with 100V systems. 8 ohm sys-
tems, se selector to 8 ohm position.
16- If desired set the 120 Hz low pass filter to the “In” position. This will allow only
frequencies below 120 Hz to reach the loudspeaker. If the switch is in the”‘out” posi-
tion, all frequencies in the input signal will reach the loudspeaker. If the AD-C81Tw is
being used with the low-pass filter set to “out” it is recommended that the input sig-
nal be filtered before it enters the loudspeaker.
17- Make sure all tests and adjustments are complete before installing the grills.
Locate the loudspeaker’s grill. The cabinet and the grill both have a small loop of
plastic line. Using the clip on the grill’s line, attach the grill’s safety loop to the cabi-
net’s loop. Carefully work the grill into its retaining slot and press firmly into place.
Work the grill in slowly and evenly to avoid damage. Make sure all tests and adjust-
ments are complete before installing the grills.
Specifications
AD-C81Tw
50- 200k Hz (-3 dB), 25- 200 Hz (-10 dB)
Frequency Response1:
Maximum Output2:
112 dB SPL continuous rms output
118 dB SPL peak output
(calculated)
Transducers:
LF: 203 mm (8”), 19 mm (0.75”) voice coil;
Nominal Coverage:
Impedance (ohms):
180° conical (average 2.5 kHz - 10 kHz)
8.0 nom./ 8.3 min. @ 42 Hz.
Power Rating3:
rms (IEC 100 hrs): 100 watts rms (100 watts)
recommended amp power: 200 watts rms, maximum
Sensitivity:
92.0 dB, 1 watt, 1 meter, flush mounted (2 pi)
Bass Loading:
Optional Processing:
Dimensions:
Net Weight:
ported, tuned to 42 Hz
125 Hz. low pass >12 dB/octave xover.
see drawings
AD-C81Tw: 9.1 kg (20.0 lb.)
Enclosure:
Corrosion-resistant power coated steel enclosure with injection-molded plastic baffle. Press on metal
grille
Mounting System:
Captive, integral mounting clamps. Insert enclosure into cutout, and tighten. Suspended ceiling C-ring
and support bars included.
Connectors:
Controls:
Ceramic block connector inputs and terminal block “through” connectors (rated for 400W max).
Transformer “tap” selector/ bypass (8 ohm) switch, settings: 7.5, 15, 30, and 60 watts (15, 30, 60 watts
for 100V) and 8 ohms. Averaged over 50Hz - 20kHz bandwidth (60W tap).
Transformer Distortion: less than .01% THD above 100Hz, 0.2% @ 50Hz (30W tap). Bandwidth: 40 - 20k
Hz (-1dB, all taps).
Agency Listings:
CE, UL 1480 (commercial/professional use, outdoor damp), UL 2043 (air handling spaces).
Specification Notes:
1- All frequency ranges specified refer to measured half-space response (2 pi).
2- Calculated maximum peak SPL at 1 m, half-space, speaker operating at rated rms power pink noise input, 50 Hz to 20 kHz.
3- Maximum input power tested in accordance with IEC recommendations; 50 Hz to 20 kHz band limiting, 6 dB signal crest factor.
Specifications are subject to change without notice.
AD-C81Tw Dimensions
CUTOUT HOLE DIAMETER = 191 mm (7.50") USE C-RING FOR TEMPLATE
MATERIAL THICKNESS RANGE FOR CLAMP MOUNTING = 5.6 - 19.0 mm (0.22" - 0.75")
How to Contact QSC Audio Products
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联系 QSC Audio Products
Mailing address:
QSC Audio Products, Inc.
1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468 USA
Telephone Numbers:
Main Number
(714) 754-6175
Sales & Marketing
Customer Service
(714) 957-7100 or toll free (USA only) (800) 854-4079
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Facsimile Numbers:
Sales & Marketing FAX
Customer Service FAX
(714) 754-6174
(714) 754-6173
World Wide Web:
E-mail:[email protected]
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA
©2007, “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.
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