CAS 3.1 AND CAS 2.1
Owner’s Guide
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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
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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 a“Listening
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 to“Normal.”
Set the Listening Window to“Wide”if 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
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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
CARPENTER’S 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.
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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
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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
“isolators”to 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
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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
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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
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BI-WIRING
The CAS speaker’s 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
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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
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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
owner’s 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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