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High performance compact speakers
Description
Continuing in the tradition of our critically acclaimed
Compact Reference series, the new CR series products
are versatile, high performance bookshelf and floor-
standing loudspeakers designed to deliver accurate,
natural reproduction.
Special care has been taken to optimize the speakers
components for maximum performance. The bass and
midrange units utilize phase plugs that conduct heat
away from the voice coil, thus increasing power han-
dling and maximizing output. The woofer cones and
surround geometry were designed and optimized with
Finite Element Analysis (FEA) computer modeling tech-
nology, for strong bass and smooth midrange.
High frequencies are handled by Boston's exclusive 1-
inch (25mm) or
3
⁄
-inch (19mm) Kortec tweeter mounted
4
in an innovative new wide dispersion projection tweet-
er baffle. This remarkable driver produces an extremely
smooth, flat response well beyond the audible range.
An aluminum heatsink attached to the tweeter's back
plate dissipates heat quickly and efficiently, assuring
cool, trouble free operation—even at very high power
levels.
All the drive units are designed at Boston's Peabody,
Massachusetts facility using state-of-the art computer-
design programs, and are built on Boston's proprietary
production lines to an incredible ±1dB—perhaps the
industry's tightest tolerance. The CRC7, CR77, and
CR97 feature MagnaGuard
‚ magnetic shielding for
®
safe placement near any sized television set.
The drivers are positioned very closely to each other for
smooth, uniform radiation in both the horizontal and
vertical planes. The rear-mounted vent is smoothly
flared to reduce port turbulence, and all speakers fea-
ture five-way binding posts, allowing wiring with virtual-
ly any cable.
CR97 • CR77 • CR67 • CR57 • CRC7
S
PECIFICATIONS
CRC7
CR57
CR67
CR77
Frequency Response (±3dB)
80Hz-20kHz
80Hz-20kHz
62Hz-20kHz
52Hz-20kHz
Recommended Amplifier Power
15-100 watts
10-75 watts
15-100 watts
15-100 watts
Nominal Impedance
8 ohms
8 ohms
8 ohms
8 ohms
Sensitivity [1 watt (2.83v) at 1m]
89dB
89dB
89dB
89 dB
Bass unit
4
1
⁄
" (115mm)
4
1
⁄
" (115mm)
5
1
⁄
" (135mm)
6
1
⁄
" (165 mm)
2
2
4
2
Passive Radiator
4
1
⁄
" (115mm)
N/A
N/A
N/A
2
Tweeter
1" (25mm) Kortec
®
3
⁄
" (19mm) Kortec
®
3
⁄
" (19mm) Kortec
®
1" (25mm) Kortec
4
4
2400Hz
2600Hz
2600Hz
2400Hz
Crossover Frequency
Dimensions (without CRB)
5
1
⁄
x 15
1
⁄
x 6
3
⁄
"
9
1
⁄
x 5
5
⁄
x 6
1
⁄
"
10
1
⁄
x 6
⁄
3
x 8
11
⁄
" 12
1
⁄
x 7
1
⁄
x 11
1
⁄
4
2
1 6
4
8
4
8
8
1 6
4
2
1 6
134 x 394 x 157mm 235 x 142 x 159mm 257 x 162 x 220mm 311 x 191 x 281mm 376 x 207 x 310mm
(H x W x D)
Net Weight
11 lbs (5.0 kgs)
5.3 lbs (2.6 kgs)
7.7 lbs (3.5 kgs)
13.5 lbs (6.2 kgs)
How to Connect Your Speakers
Correctly wiring your speakers is important for achieving the best sound
quality. Wiring should take just a few minutes, but it's important to do it care-
fully, since incorrect wiring (such as reversed connections) can result in a
poor soundstage and poor bass.
We recommend 18-gauge wire or thicker for runs up to 18ft. (6m), and 16-
gauge wire or thicker for longer runs. Separate the first few inches of the wire
conductors. Strip off about
1
⁄
-inch (12mm) of insulation from the ends of
2
each speaker wire to expose the two conductors and tightly twist the wire
strands.
WARNING: To prevent electrical shock hazard, always switch off the ampli-
fier or receiver when making connections to the speaker.
When making all connections, be sure to connect the + (red) on the speaker to
the + (red) on the amplifier, and the – (black) on the speaker to the – (black)
on the amplifier.
-
+
Using the five-way binding posts:
IMPORTANT: Typically, one side
The binding posts permit easy
of the wire is smooth. Connect
this side to the – (black) connec-
connection to banana plugs,
spade lugs, and bare wire. Insert
tion. The other side has a rib or
the wire in the hole and tighten.
stripe. Connect this to the + (red)
connection.
How to Place Your Speakers
For a standard stereo (two-channel) application most people like to hear a
CR97
realistic soundstage, as they would from a good seat in a concert hall. To
40Hz-20kHz
achieve this effect, place the speakers 6 to 12 Ft. (2–4m) apart, so they form
15-125 watts
a triangle with your favorite listening position.
8 ohms
For home theater applications place the left and right speakers on each
91 dB
side of the television, as you would place them in a stereo application. Place
7" (180 mm)
center channel speaker as shown below, with the front of the speaker flush
with the front of the television (the center speaker can be placed either
N/A
above or below the television).
®
1" (25mm) Kortec
®
2400Hz
When using the CR speakers as surround speakers, they can be placed on
the side or back walls. Recommended placement is above ear level on the
" 34
1
⁄
x 8
3
⁄
x 12
1
⁄
"
2
1 6
4
side walls behind the listening position. However, experimentation will yield
the best possible results for every room. If possible, permanent mounting
of the CR speaker should only be done after the optimum location is
33 lbs (15 kgs)
determined.
When using the CR speakers in a home theater application you will want to
add a subwoofer. There are many Boston solutions available; the best solu-
tion depends on available space and the size of the room. To discover all of
the options available, please consult your Boston Acoustics dealer.
For all applications, the speakers should be at least 18-inches (0.6m) from
the corners of the room. Putting the speakers too close to a corner can pro-
duce an unnatural bass reinforcement that detracts from their balanced,
uncolored sound. If a speaker must be placed near a corner, move it away
from the wall directly behind it to preserve its natural tonal balance.
Right
Center
Speaker
Left
Speaker
Speaker
Subwoofer
6-12 ft. (2-4m)
Left
Surround
Speaker
Mounting Options
Your CR speakers have several convenient mounting options:
STAND OR SHELF: Peel off the included rub-
ber feet from their adhesive backing and stick them
on to the four bottom corners of each speaker.
KEYHOLE BRACKET: Consult a knowledge-
able installer regarding the proper hardware to use
on your wall surface. A 1-inch (25mm) long wall
anchor is recommended for hollow walls.
Regardless of the type of wall fastener used, the
screw head diameter should be between
inch (8 to 9.5 mm) to fit properly inside the keyhole
and slide down on to the slot. Apply the rubber
feet the rear of the speaker to prevent any scratch-
ing or marring of the wall surface.
Note: The CRC7 features two keyhole brackets allowing vertical or horizontal placement—per-
fect for using three in an L/C/R application around a wall mounted flat panel television.
CRB BRACKET: This optional stand-off/swivel
bracket can be purchased from your dealer or
ordered directly from Boston Acoustics. The CRB
attaches to the back of the speaker using the four
mounting holes located at either side of the key-
hole bracket. Instructions on how to attach this
bracket to the speaker and mount the assembly to
the wall are supplied in the CRB kit.
Rotating the Logo
The CR grille logo can be rotated 90° in either
direction when mounting the speaker horizontally
or to maintain symmetry from left to right. The
logo is spring loaded; to rotate the logo, simply
spin it into the desired position.
Right
Surround
Speaker
Listening Levels and Power
5-8 ft.
Handling
(1.6-2.6m)
The listed power recommendations assume you will operate your system
in a way that will not produce distortion. Even these rugged speakers can
be damaged by a modest amplifier if it produces distortion. If you hear a
harsh, gritty noise, turn down the volume. Prolonged or repeated opera-
tion of your speaker with a distorted signal from the amplifier can cause
damage that is not covered by the warranty.
If Service Seems Necessary
First, contact the dealer from whom you purchased the speakers. If that is
not possible, write to:
Boston Acoustics, Inc. 300 Jubilee Drive, Peabody, MA 01960 U.S.A.
We will promptly advise you of what action to take.
ENGLISH
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