QSC Audio Speaker AD C42T User Guide

AcousticDesignTM In-ceiling Loudspeakers User Manual  
AD-C42T  
105 mm (4”) two-way  
*TD-000263-00*  
TD-000263-00-A  
 
Introduction  
Congratulations and thank you for your ceiling loudspeaker purchase. The AD-C42T mod-  
els offer excellent acoustic performance in an easy-to-install and attractive package.  
Please review these instructions carefully and follow the recommendations. Consult a  
licensed installation professional if you are uncertain about any mounting issues.  
The AD-C42T models feature a 4” low frequency (LF) driver and a 3/4” dome high fre-  
quency (HF) driver. The AD-C42T are equipped with an audio transformer suitable for 70V  
and 100V distributed systems, as well as a tap-selector switch which can bypass the  
transformer for 8 ohm applications.  
What’s Included  
Your ceiling loudspeaker box contains:  
- two loudspeaker cabinets  
- two protective grill assemblies  
- four support brackets for suspended ceiling installations  
- two 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  
- two grill clips used for clipping the plastic grill retaining lines together  
- two phoenix connector assemblies for connecting signal and daisy-chaining  
- two paint shields  
- two grille cloths  
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 terimainal block or by using Phoenix 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  
supporting structure should fail.  
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 cabinet into  
the mounting cutout, make sure  
the clamps are folded in against  
the cabinet, see 1, right.  
After the cabinet is installed into  
the mounting 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 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 two pin plugs observing correct polarity. The other two  
pin plugs 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 mounting sur-  
face.  
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 application,  
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 enclosure  
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 connections or  
pinch the wires. Tighten the cover plates retaining screw.  
12- Adjust the wiring at the entry point, if necessary, and properly secure fitting. This pre-  
vents 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 loudspeakers mounting clamp screws.  
15- Set the tap selector switch to the desired position. 70V systems, all four positions may  
be used. Do not use highest tap setting with 100V systems. 8 ohm systems, selector to 8  
ohm position.  
16- 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 cabinet’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 adjustments are complete before install-  
ing the grills.  
 
Specifications  
AD-C42T  
100- 20k Hz (-3 dB), 85- 20k Hz (-10 dB)  
Frequency Response1:  
Maximum Output2:  
101 dB SPL continuous rms output  
107 dB SPL peak output  
(calculated)  
Transducers:  
LF: 105 mm (4”), 19 mm (0.75”) voice coil;  
weatherproof, low-distortion polypropylene cone.  
HF: 19mm (0.75”) titanium dome, neodymium magnet.  
Nominal Coverage:  
Impedance (ohms):  
100° conical (average 2.5 kHz - 10 kHz)  
8.0 nom./ 6.7 min. @ 300 Hz.  
Power Rating3:  
rms (IEC 100 hrs): 40 watts rms (30 watts, AD-C42T)  
recommended amp power: 80 watts rms, maximum  
Sensitivity:  
85.0 dB, 1 watt, 1 meter, flush mounted (2 pi)  
Bass Loading:  
Optional Processing:  
Dimensions:  
Net Weight:  
sealed  
100 to 125 Hz. high pass >12 dB/octave  
see drawings  
AD-C42T: 2.7 kg (6.0 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: 3.8, 7.5, 15, and 30 watts (7.5, 15, 30 watts  
for 100V) and 8 ohms. Averaged over 50Hz - 20kHz bandwidth (30W 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-C42T 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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