Infinity Speaker CAS 21 User Manual

CAS 3.1 AND CAS 2.1  
Owner’s Guide  
 
Unpacking the Product  
Finish unpacking the speakers and check the contents. If you  
suspect damage from transit, report it immediately to your  
dealer. Keep the shipping carton and packing materials for  
future use.  
Included  
CAS 3.1  
CAS 2.1  
MOUNTING  
BAFFLE  
MOUNTING  
BAFFLE  
FRAME  
ASSEMBLY  
FRAME  
ASSEMBLY  
GRILLE  
GRILLE  
CARDBOARD SHIM  
GRILLE INSERTS (4)  
TEMPLATE  
FIBERGLASS  
INSULATION  
SCREWS (4)  
INSERTS (4)  
EXTRA LOGOS  
3
CAS 3.1/CAS 2.1  
 
FIGURE 1  
PLACEMENT  
LEFT  
RIGHT  
CHANNEL  
CHANNEL  
The Infinity CAS in-wall speakers are designed to offer excellent  
performance in any listening room or home theater system.  
2-Channel or Front Left and Front Right  
in a Home Theater System  
Ideally, the speakers should be placed at least three feet away  
from the side walls. In 2-channel applications, the two speakers  
should be equidistant from your primary listening position.We  
recommend that the angle formed between the speakers and the  
listening area be between 45° and 60°. For example, if the  
speakers are 8' apart, your listening position should be 8' to  
12' from each speaker. See Figure 1.  
SOFA  
When used as part of a home theater system, you may find that  
you achieve excellent performance with the left and right  
speakers spread apart even further.  
FIGURE 2  
FRONT  
FRONT  
R
Surround Channels in a Home Theater System  
F
LEFT  
RIGHT  
When used as part of a Dolby* ProLogic,* THX® or discrete 5.1-  
channel home theater system, the surround speakers should be  
placed at the sides of, and directed toward, the main listening  
area. See Figure 2. If there are several rows of seating, place the  
speakers, as described above, perpendicular to, or slightly  
behind, the last row of seating.  
INFINITY  
SUBWOOFER  
TV  
(optional)  
When used as part of a 7-channel music or home theater system,  
place the side speakers at the sides of and directed toward the  
main listening area. If there are several rows of seating, place  
the speakers, as described above, perpendicular to the middle  
row of seating.The rear speakers should be placed along the  
rear wall facing the front of the room. Each rear speaker should  
be about 1/3 of the way into the room, but never to the outside of  
the listening area. See Figure 3.  
LEFT  
R
RIGHT  
SOFA  
SURROUND  
SURROUND  
Listening Window Selector™  
We recognize that in-wall speakers are often installed in less than the ideal  
locations described above.The CAS in-wall speakers include aListening  
Window Selector(Fig. 4) which allows the speaker to be fine-tuned for  
optimal performance regardless of where the speaker is installed or the  
listener is positioned. Choosing the correct position is simple.  
FIGURE 3  
FRONT  
FRONT  
F
LEFT  
RIGHT  
If the speakers are installed and the listening position is usually as  
TV  
described above, then set the switch toNormal.”  
Set the Listening Window toWideif any of these situations occur:  
The speakers are installed with the  
tweeter positioned either well above  
or below ear level.  
FIGURE 4  
The speakers are greater than  
LISTENING WINDOW SELECTOR  
8' apart or are on different walls.  
There is no primary listening area or  
the listeners tend to be moving around  
such as during a party.  
LEFT  
R
RIGHT  
SOFA  
SIDE  
SIDE  
WIDE  
NORMAL  
LEFT  
RRIGHT  
RREAR  
REAR  
4
CAS 3.1/CAS 2.1  
 
Step 2  
INSTALLATION  
Note that the CAS 3.1 and CAS 2.1 speakers come with the  
baffle assembly attached to the mounting frame at its four  
corners to prevent damage during shipping. Unscrew the four  
screws as shown and carefully lift the baffle assembly out  
of the mounting frame. Note that the CAS 3.1 and CAS 2.1  
speakers are designed for IR connectivity.The IR lens cover is  
The CAS Series of in-wall speakers were designed to be easily  
installed. However, if you are unsure of your ability to properly  
install these loudspeakers, please contact your dealer or a  
qualified installer.  
SCREWS  
Tools Needed  
INSERTS  
BAFFLE ASSEMBLY  
PENCIL  
#2 PHILLIPS SCREWDRIVER  
MEASURING TAPE  
UTILITY KNIFE  
CARPENTERS LEVEL  
Installation Instructions  
Step 1  
After removing all parts from the box, locate the supplied  
template and use it to trace a pattern on the wall where you want  
to mount the speaker system.Take care to locate the system  
roughly centered between wall studs, allowing at least 1"  
between the cutout and wall studs. Cut the mounting hole, being  
careful not to cut into any electrical wiring or plumbing. Run the  
wiring from your system to the hole. NOTE: Be sure to comply  
with local wiring codes.  
MOUNTINGFRAME
IR Sensor  
The CAS 3.1 and CAS 2.1 speakers are designed for IR  
connectivity.The IR lens cover is located on the front of the  
speaker assembly and a place for mounting the sensor (not  
included) is located behind this lens on the crossover network  
board. See your IR instructions for specific installation  
recommendations.  
Step 3 (optional)  
If the grilles are going to be painted, it is necessary to remove  
the cloth behind the grille by lifting the edges of the cloth from  
the center and pulling it out.After painting the grille, replace  
the cloth.Also, remove the logo from the grille. Extra logos are  
provided to attach to the grille after the paint has dried.  
located on the front of the SPEAKER ASSEMBLY and a place for  
mounting the sensor is located behind this lens on the crossover  
network board. See your IR instructions for specific installation  
5
CAS 3.1/CAS 2.1  
recommendations.  
 
Step 4  
The CAS mounting frame has a series of spring-loaded clamps  
around its perimeter.These are designed to fold shut as you push  
the mounting frame into the hole and spring open once inside,  
thus holding the mounting frame in the wall. Insert the mounting  
frame into the cutout, making sure that you run the speaker wire  
in through the rear opening. Starting from the lower right-hand  
corner and working in a counterclockwise fashion, hand-tighten  
each of the 12 clamp screws (ONLY until almost snug). If needed,  
adjust the mounting frame so it is level and centered in the  
cutout. Go around once more and hand-tighten each screw as  
needed. Before proceeding to Step 5, verify that each of the  
clamp screws is tight.  
1.  
SCREW
CLAMP  
WALL  
WALL  
2.  
WALL  
WALL  
SR RS  
SPEAKER WIRES  
3.  
CLAMP  
WALL  
WALL  
Note how the clamp will push closed while being inserted into  
the hole in the wall and spring open again once past the wall.  
Tightening the screw snugly will hold the mounting frame to  
the wall.  
Notehowtheclamp  
springs open  
6
CAS 3.1/CAS 2.1  
 
Step 5  
Place the supplied fiberglass insulation in the rear of the  
mounting frame. Place the cardboard shim on top of the lower  
front ledge of the frame, as shown.The cardboard shim is for  
aligning the baffle assembly properly within the speaker  
mounting frame. Lift the speaker baffle up and place it on the  
shim. Connect the speaker wires as shown on pages 9 and 10  
and slide the baffle into place. Be sure that as you slide the  
speaker baffle assembly into place, the speaker wires are clear  
of the woofer basket and do not get pinched between the baffle  
and the mounting frame. Insert the four screws through the  
inserts into the holes and tighten by hand just until snug.  
SSCREWS  
INE
INSERTS  
WARNING: If you overtighten these screws, it may cause the  
isolatorsto become overcompressed and they will no longer  
function correctly. Maximum tightening of these screws is no  
more than 16-inch-pounds. Remove baffle shim when complete.  
REMOVE SHIM AFTER  
S
R
SECURING SCREWS  
FIEGAS  
FIBERGLASS  
INSULATION  
MOUNTING FRAME  
SPEEAAKKEERWWIRREES  
BAFFLE ASSEMBLY  
CARDBOARD SHIM  
7
CAS 3.1/CAS 2.1  
 
Step 6  
Insert the four rubber grommets that retain the grille posts into  
the screw hole on the front, as shown.The grille has two side  
clips that look like wings.These extend about 1/4". See  
illustration. Note the side flange areas that catch the clips. Make  
sure these side clips are extended before attaching or removing  
the grille. Extend the side clips and attach the grille, reclipping it  
once in place.These side clips push inward to lock the grille  
onto the speaker.  
NOTE THAT THE  
SIDE CLIPS ARE  
PULLED OUT 1/4"  
SIDE FLANGE  
AREAS  
¤
¤
GROMMET  
GRILLE  
For Removal  
Step 1a  
Pull out side clips on sides of the grille. Pull grille off.  
Step 2a  
Remove the rubber grommets from the holes to access screws.  
It is best to use a #2 Phillips screwdriver to gently pry the  
grommet out. Unscrew the four baffle-retaining screws  
and carefully remove the speaker housing. Disconnect the  
speaker wires.  
Step 3a  
Fully unscrew all of the clamps around the speaker housing.The  
clamp screws have a stop on them so you do not have to worry  
about accidental disassembly. Now move the speaker housing out  
from the wall enough to wedge your hand behind and pinch a  
clamp shut.While the clamp is shut, work the speaker housing  
forward enough to catch the shut clamp in the wall opening.  
Work your way around the perimeter, carefully doing this to each  
clamp and remove the speaker housing from the wall.  
8
CAS 3.1/CAS 2.1  
 
STANDARD WIRING  
CAS 2.1  
(One Channel Shown)  
Amplifier/Receiver  
CAS 3.1  
(One Channel Shown)  
Amplifier/Receiver  
Speaker Outputs  
Speaker Outputs  
CAS 3.1 INWALL  
LF+  
CAS 2.1 INWALL  
(+)  
(+)  
HF+  
HF–  
OPTIONAL  
IR SENSOR  
(–)  
(+)  
(–)  
(+)  
HF–  
HF+  
LF–  
LF+  
INPUT  
INPUT  
STRAPPING WIRES  
LF–  
INPUT  
(–)  
(–)  
OPTIONAL  
IR SENSOR  
INPUT  
STRAPPING WIRES  
STRPPNWRE
RED  
RED = +  
BLACK  
= –  
NO STRIPE  
N= –  
S
S
T
T
R
R
I
I
P
P
E
E
= +  
1. LOOSEN TERMINALS  
2. INSERT BARE END;  
TIGHTEN TERMINALS  
IMPORTANT: The high-frequency (HF) and low-frequency (LF) sections are joined by strapping wires.The strapping wires must remain in  
position for proper operation with standard wiring. See page 10 for bi-wiring instructions.  
9
CAS 3.1/CAS 2.1  
 
BI-WIRING  
The CAS speakers connection panel and internal dividing network are designed so that separate sets of speaker cables  
can be attached to the low-frequency transducer and midrange/high-frequency transducer portions of this dividing network.  
This is called bi-wiring. Bi-wiring can provide several sonic advantages and considerably more flexibility in power amplifier selection.  
1. Remove strapping wires.  
2. Insert the speaker wire for the high frequencies into the (HF+) and (HF) terminals and tighten.  
3. Insert the speaker wire for the low frequencies into the (LF+) and (LF) set of terminals and tighten.  
CAS 2.1  
CAS 3.1  
(+)  
(+)  
HF–  
HF+  
LF+  
TRAPNG RS ROED  
STRAPPING WIRES REMOVED  
HF+  
HF–  
LF–  
LF –  
SI
STRAPPING WIRES REMOVED  
()  
()  
LF+  
Single-Stereo Amplifier  
CAS 2.1  
Right  
Speaker  
CAS 3.1  
Right  
Speaker  
Left  
Speaker  
Left  
Receiver/  
Speaker  
Amplifier  
Receiver/  
Amplifier  
HF –  
HF –  
HF+  
LF –  
LF+  
Right  
Left  
Right  
Left  
HF+  
LF –  
LF+  
LF+  
HF+  
LF+  
HF+  
+
LF –  
HF –  
LF –  
HF –  
+
Dual-Stereo Amplifier  
One amplifier drives the low-frequency sections of both speakers.A second amplifier drives the  
mid/high-frequency sections of both speakers.  
CAS 2.1  
Right  
CAS 3.1  
Left  
Speaker  
Speaker  
Right  
Amplifier 1  
Amplifier 2  
Left  
Speaker  
Speaker  
Amplifier 1  
Amplifier 2  
Right  
Right  
Left  
Left  
HF –  
HF –  
Right  
Right  
Left  
Left  
LF+  
HF+  
LF+  
HF+  
HF+  
LF –  
LF+  
HF+  
LF –  
LF+  
LF–  
HF–  
LF–  
HF–  
+
+
+
+
10  
CAS 3.1/CAS 2.1  
 
INSTALLER INFORMATION  
Enclosures  
The internal volume of an enclosure is directly related to the  
amount of low-frequency extension and output that can be  
accurately reproduced by a loudspeaker.The CAS in-wall  
loudspeakers were designed to use the typical wall cavity  
dimensions of 8' x 14-1/2" x 3-1/2" for maximum low-frequency  
extension. However, due to varying construction standards,  
materials and applications, it is sometimes beneficial to create a  
dedicated enclosure for the speakers.The charts below show the  
internal volumes of sample enclosures and the resulting 3dB  
points for each model.  
CAS 3.1  
Internal  
Volume  
CAS 2.1  
Internal  
Volume  
3dB  
Frequency  
3dB  
Frequency  
2.7 cu. ft. 32Hz  
1.35 cu. ft. 38Hz  
2.7 cu. ft. 40Hz  
1.35 cu. ft. 45Hz  
It is important that the enclosures be well-constructed; MDF is  
recommended.The enclosure should be securely mounted to the  
adjacent wall studs. In addition, the enclosure should be filled  
with fiberglass insulation so that the enclosure is full, but the  
insulation is not compressed.  
Thiele/Small Parameters  
CAS 3.1  
CAS 2.1  
0.72  
TS  
AS  
S
Total Q  
Q
V
F
Q
Q
R
0.71  
Compliance Volume  
Free-Air Resonance  
Mechanical Q  
72.3 liters  
34.8Hz  
11.46  
43.1 liters  
40Hz  
MS  
ES  
E
11.27  
Electrical Q  
0.76  
0.77  
Voice-Coil DC Resistance  
Moving Mass,Air Load  
Suspension Compliance  
4.06 ohms  
4.05 ohms  
MS  
M
34.79 grams 23.10 grams  
601um/N 671um/N  
MD  
C
Motor Force Factor  
Driver Radiating Area  
BL 6.39 Tesla-M 5.56 Tesla-M  
0.0293m2  
0.0214m2  
D
S
11  
CAS 3.1/CAS 2.1  
 
SPECIFICATIONS  
CAS 3.1  
CAS 2.1  
7-1/2" C.M.M.D.  
Woofer:  
9" C.M.M.D.  
Midrange:  
Tweeter:  
3-1/2" C.M.M.D.  
1" C.M.M.D.  
1" C.M.M.D.  
System Frequency  
Response:  
(+_3dB)  
32Hz*22,000Hz  
40Hz*22,000Hz  
Sensitivity:  
(2.83V @ 1 meter)  
90dB  
90dB  
Recommended Amplifier  
Power Range:  
15 200 Watts  
15 150 Watts  
8 Ohms  
Nominal Impedance:  
Crossover Frequency:  
Dimensions:  
8 Ohms  
400Hz, 2,800Hz; 24dB/octave  
2,800Hz; 24dB/octave  
Outer (including grille)  
(H x W x D)  
22-1/8" x 14-7/8" x 3-1/2"**  
(562mm x 378mm x 89mm)  
17-7/8" x 13" x 3-1/2"**  
(454mm x 330mm x 89mm)  
Wall Cutout  
(H x W)  
19-1/8" x 12-1/2"  
(486mm x 318mm)  
14-7/8" x 10-1/2"  
(378mm x 267mm)  
Weight:  
15 lb (6.8kg)  
11 lb (5kg)  
(including frame, speaker and grille)  
**Depending upon enclosure volume. See page 11 for detailed information.  
**Depth excludes grille.  
Infinity continually strives to update and improve existing products, as well as create new ones.The specifications and construction details in this and  
related Infinity publications are therefore subject to change without notice.  
Declaration of Conformity  
We, Harman Consumer International  
2, route de Tours  
72500 Chateau-du-Loir  
France  
declare in own responsibility, that the products described in this  
owners manual are in compliance with technical standards:  
EN 50081-1:1992  
EN 50082-1:1997  
Robin Marshall  
Harman Consumer International  
Chateau-du-Loir, France. 10/01  
© 2001 Infinity Systems, Inc., 250 Crossways Park Drive,Woodbury, NY 11797 USA (800) 553-3332 (USA Only) www.infinitysystems.com  
*Trademarks of Dolby Laboratories.THX name and logo are © Lucasfilm Ltd. & trademarked.All rights reserved. Used under authorization.  
Infinity is a registered trademark of Infinity Systems, Inc. Printed in USA 12/01 Part No. 337581-001  
 

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