QSC Audio Speaker AD C81Tw User Guide

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 cabinets  
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-  
nets 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  
Cómo comunicarse con QSC Audio Products  
Comment prendre contact avec QSC Audio Products  
Kontaktinformationen für QSC Audio Products  
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  
(714) 957-7150 or toll free (USA only) (800) 772-2834  
Facsimile Numbers:  
Sales & Marketing FAX  
Customer Service FAX  
(714) 754-6174  
(714) 754-6173  
World Wide Web:  
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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