Owner’s Manual
P143
P153
P163
P253
P363
PC251
PC351
INFINITY PRIMUS
Couch/listening position
Stereo player
Right
channel
Left
channel
Couch
Front
right
channel
Front
left
channel
Center
channel
Surround
right
channel
Surround
left
channel
Infinity subwoofer
(optional)
Couch
Front
right
channel
Infinity subwoofer
(optional)
Front
left
channel
Center
channel
Surround
right
channel
Surround
left
channel
®
SERIES
The Primus series of loudspeakers continues the longstanding Infinity
commitment to accurate sound reproduction. Our proprietary MMD®
(Metal Matrix Diaphragm) drivers, precision dividing networks and rigid,
well-braced enclosures combine to deliver uncompromised performance
in any stereo or multichannel home theater system. In addition, Primus
series speakers are magnetically shielded for safe placement adjacent to
a television.
UNPACKING THE SPEAKERS
If you suspect damage from transit, report it immediately to your dealer.
Keep the shipping carton and packing materials for future use.
PLACEMENT
Stereo
Before deciding where to place your Primus speakers, survey your room
and think about placement, using Figure 1 as a guide and keeping the
following points in mind:
For best results, place the speakers 6 to 8 feet (1.8 to 2.4 meters) •
apart.
Position each speaker so that the tweeter is approximately at ear level.•
Generally, bass output will increase as the speaker is moved closer to •
a wall or corner.
Refer to the “Home Theater”section on this page if you plan to use the •
speakers for home theater reproduction.
Home Theater
For front-channel use, place one speaker on the left and another on
the right of the television monitor. Since the speakers are magnetically
shielded, you can place them without worrying about their distorting the
TV picture.
For surround-sound use, place the speakers alongside the listening
position. Final placement depends on room acoustics, availability of space
and your listening preference (Figures 2 and 3).
Place the center-channel speaker on top of or directly below the
television. Aim it toward the listening area.
NOTE: An Infinity powered subwoofer will add impact and realism to both
music and film soundtracks. Contact your Infinity dealer for recommendations
on subwoofer models.
Figure 1. This overhead view shows a typical stereo-speaker plan.
Experiment with speaker placement to obtain the best bass level and stereo
imaging in your room.
Figure 2. This overhead view shows a typical home theater plan. The left/
right rear channels are for a seven-channel system. The center rear
channel is for a six-channel system.
Figure 3. This figure shows an alternate layout, which may be more
suitable for some rooms. The left/right rear channels are for a sevenchannel system. The center rear channel is for a six-channel system.
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INFINITY PRIMUS SPEAKERS
WALL-MOUNTING THE P143, P153 AND
Figure 4.
– +
Keyhole mounts
1/4" - 20 threaded insert
(P143 only)
PC251
We have designed the P143, P153 and PC251 speakers to mount directly
onto a wall. Each speaker has two keyholes on the back and will require
two 1-1/2" (38mm), #10 wood screws fastened to a wall stud. If a wall
stud is unavailable, install an anchor appropriate for a 1-1/2", #10
screw.
NOTE: You are responsible for the correct selection and use of mounting
hardware (available through hardware stores) that will ensure the proper
and safe wall-mounting of the speakers.
CHANGING THE P253 AND P363 FEET
The P253 and P363 feature attractive outboard feet, installed at the
factory. However, if you would like to replace them with the less visible
inboard feet (included), follow the instructions below.
Remove the four feet on the bottom of the speaker by loosening the 1.
screw in each foot. Keep the screws for later use.
Remove the rubber plug from each inner hole (and save it for possible 2.
future use).
Attach the black inboard feet to the inner holes from which you just 3.
removed the rubber plugs. Use the same screws that you just removed.
Tighten the screws securely, using a handheld Phillips (+ tip) 4.
screwdriver. Do not use a powered screwdriver of any type.
Step 1.
Mark the positions on the wall where you would like to place the mounting
screws.
Step 2.
Fasten two 1-1/2", #10 wood screws to the wall using the markings
from Step 1 as your guide. Leave an 11/16" (17.5mm) space between the
wall
and screwhead. If a wall stud is not available, use an appropriate anchor.
Step 3.
Place the speaker on the wall by aligning the keyholes on the back of the
speaker to the screwheads on the wall. Once positioned properly, the
speaker should slide down slightly and become secure.
The P143 also allows you to use third-party wall brackets using the
1/4"-20 threaded insert located beneath the keyhole mount. Consult the
wall-bracket manufacturer to select the proper bracket.
CAUTION: Floorstanding (tower) loudspeakers have a high center of
gravity and may become unstable and tip over during earthquakes or if
they are rocked, tipped or improperly positioned. Consider anchoring
these speakers to the wall behind them, using the procedures and
hardware customary for anchoring bookcases and wall units. You are
responsible for proper installation and proper selection of hardware.
INFINITY PRIMUS SPEAKERS
3
WIRING THE SYSTEM
1
Loosen
terminal
2
Insert bare end;
tighten terminal
Black (
–)
No stripe (
–)
Stripe (
+)
+–
Receiver or
amplifier
(rear view)
Speaker (rear view)
– +
(One channel shown)
REDBLACK
IMPORTANT: Make sure that all equipment is turned off before making
any connections.
For speaker connections, use a minimum #16-gauge speaker wire with
polarity coding.The side of the wire with a ridge or other coding is usually
considered positive polarity (i.e., +).
NOTE: If you are unsure about the proper wire to use, consult your local
Infinity dealer about speaker wire and connection options.
The speakers have coded terminals that accept a variety of wire
connectors. Figure 5 shows the most common connection.
Figure 5. This example shows how to connect bare wires to the terminals.
To ensure proper polarity, connect each + terminal on the back of the
amplifier or receiver to the respective + (red) terminal on each speaker,
as shown in Figure 6. Connect the – (black) terminals in a similar way.
See the owner’s guides that were included with your amplifier, receiver
and television to confirm connection procedures.
IMPORTANT: Do not reverse polarities (i.e., + to – or – to +) when
making connections. Doing so will cause poor imaging and diminished
bass response.
FINAL ADJUSTMENT
Check the speakers for playback, first by setting the system volume control
to a minimum level and then by applying power to your audio system.
Play a favorite music or video segment, and increase the system volume
control to a comfortable level.
NOTE: You should hear balanced audio reproduction across the entire
frequency spectrum, from high tones to deep bass. If not, check all wiring
connections or consult the authorized Infinity dealer from whom you
purchased the system.
A number of different factors – including the room’s size and shape,
the construction materials used to build the room, the listener’s position
relative to the speakers, and the position of the speakers in the room –
will affect the amount of bass you hear and the stereo-image quality (the
placement of sounds in space). Listen to a variety of music selections and
note the bass level. If there is too much bass, move the speakers away
from nearby walls. Conversely, if you place the speakers closer to the
walls, you should hear more bass.
Nearby reflecting surfaces can adversely affect stereo-imaging quality.
If they do, try angling the speakers slightly inward toward the listening
position until you achieve the best possible sound.
CARE OF YOUR SPEAKER SYSTEM
Each Primus series cabinet has a wood-grain vinyl finish that does not
require any routine maintenance. You may use a soft cloth to remove any
fingerprints or dust. Clean the grille by gentle vacuuming.
NOTE: Do not use any cleaning products or polishes on the cabinet or
grille.
If your Infinity speaker needs service, contact your Infinity dealer or
distributor, or visit www.infinitysystems.com for the location of the nearest
service center.
4
Figure 6. Wiring diagram shows polarity connections for one channel of a
stereo or home theater system.
INFINITY PRIMUS SPEAKERS
SPECIFICATIONS
P143 P153 P163
Frequency range (±3dB):
100Hz – 20kHz 58Hz – 20kHz 49Hz – 20kHz
Recommended
amplifier power: 10 – 100 watts 10 – 100 watts 10 – 150 watts
Sensitivity:
(2.83V @ 1 meter)
Nominal impedance:
Crossover frequency:
Low-frequency driver:
High-frequency driver:
Dimensions (H x W x D):
(with grille)
Weight:
86dB 88dB 90dB
8 ohms 8 ohms 8 ohms
3000Hz; 24dB/octave 3300Hz; 24dB/octave 3000Hz; 24dB/octave
4" (100mm) MMD,
magnetically shielded
3/4" (19mm) MMD,
magnetically shielded
9-7/8" x 5-15/16" x 6-13/16"
(251mm x 150mm x 173mm)
7 lb (3.2kg) 13.5 lb (6kg) 16.1 lb (7.3kg)
5-1/4" (130mm) MMD,
magnetically shielded
3/4" (19mm) MMD,
magnetically shielded
13" x 7-3/8" x 10-1/2"
(330mm x 187mm x 267mm)
6-1/2" (165mm) MMD,
magnetically shielded
3/4" (19mm) MMD,
magnetically shielded
14-3/4" x 8-1/4" x 11"
(375mm x 208mm x 280mm)
P253 P363 PC251 PC351
Frequency range (±3dB): 49Hz – 20kHz 38Hz – 20kHz 80Hz – 20kHz 80Hz – 20kHz
Recommended
amplifier power: 10 – 150 watts 10 – 200 watts 10 – 150 watts 10 – 150 watts
Sensitivity:
(2.83V @ 1 meter)
Nominal impedance: 8 ohms 8 ohms 8 ohms 8 ohms
Crossover frequency: 2500Hz; 24dB/octave 350Hz, 3300Hz; 24dB/octave 3000Hz; 24dB/octave 650Hz, 2800Hz; 24dB/octave
Low-frequency driver:
Mid-frequency driver(s):
High-frequency driver:
Dimensions (H x W x D):
(with grille)
Weight: 35.3 lb (16kg) 48.5 lb (22kg) 17.6 lb (8kg) 25 lb (11.4kg)
92dB 93dB 90dB 91dB
Dual 5-1/4" (130mm) MMD,
magnetically shielded
N/A
3/4" (19mm) MMD,
magnetically shielded
35-3/4" x 7-3/8" x 11-3/4"
(908mm x 187mm x 300mm)
Dual 6-1/2" (165mm) MMD,
magnetically shielded
4" (100mm) MMD,
magnetically shielded
3/4" (19mm) MMD,
magnetically shielded
39-1/4" x 8-1/4" x 13"
(997mm x 208mm x 330mm)
Dual 5-1/4" (130mm) MMD,
magnetically shielded
N/A
3/4" (19mm) MMD,
magnetically shielded
7-5/8" x 18" x 9-5/8"
(194mm x 457mm x 245mm)
Dual 5-1/4" (130mm) MMD,
magnetically shielded
Dual 3" (75mm) MMD,
magnetically shielded
3/4" (19mm) MMD,
magnetically shielded
7-3/8" x 23-7/8" x 9-1/4"
(187mm x 606mm x 235mm)
Infinity engineers continually strive to update and improve existing products as well as to create new ones. The specifications and construction details in this and related Infinity publications are
therefore subject to change without notice.
INFINITY PRIMUS SPEAKERS
5
NOTES
6
INFINITY PRIMUS SPEAKERS
NOTES
INFINITY PRIMUS SPEAKERS
7
Harman Consumer, Inc.
8500 Balboa Blvd., Northridge, CA 91329 USA
© 2010 Harman International Industries, Incorporated. All rights reserved.
Infinity, Infinity Primus and MMD are trademarks of Harman International Industries,
Incorporated, registered in the United States and/or other countries. Dolby is a
registered trademark of Dolby Laboratories. DTS is a registered trademark of DTS, Inc.
Features, specifications and appearance are subject to change without notice.
Part No. 950-0303-001 6/10
www.infinitysystems.com
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