Boston Acoustics Speaker 351 361 381 User Manual

351  
361  
381  
Designer Series  
In-wall Speaker Systems  
 
Installation Instructions  
NOTE: This manual assumes the installer possesses skill in the proper use of hand and power  
tools, a knowledge of local building and fire codes and a familiarity with the environment behind  
the wall or ceiling in which the speakers will be installed.  
Loudspeaker  
Side View  
Mounting Bracket  
Mounting Hole  
351  
361  
381  
958"  
834"  
912"  
(143mm)  
(223mm)  
(241mm)  
258"  
634"  
558"  
534"  
(67mm)  
(171mm)  
(143mm)  
(146mm)  
1012"  
(267mm)  
978"  
(251mm)  
10916"  
(268mm)  
734"  
(197mm)  
278"  
(73mm)  
718"  
(181mm)  
61116"  
(170mm)  
1134"  
(298mm)  
1238"  
(315mm)  
1238"  
(315mm)  
9916"  
(243mm)  
314"  
(83mm)  
812"  
(216mm)  
8916"  
(218mm)  
Examine the contents of the package and verify that it contains the following:  
Quantity  
Description  
Quantity  
Description  
2
2
2
2
2
1
1
1
Designer Series Speakers  
Mounting Bracket  
Barrier Cloth  
Painting Mask  
Metal Grille  
Hardware package* contents:  
12  
2
8-32 x 2" screw  
Cable clamp – 316"  
* If the hardware package is missing any items, or is not found,  
additional packages are available from Boston Acoustics.  
Template  
Owners Manual/Installation Instructions  
Hardware Package*  
3
 
Placement  
Since the speaker installation is permanent and the furniture placement may not be, the user  
should first determine the best long-term location — one that will accommodate future relocation  
of the furniture in the room, while still allowing for an unobstructed sound path from the speakers  
to the listening area.  
Within reason, wherever the speakers look  
right is where they’ll sound right. For best  
results, place the speakers 610 feet  
12-18 inches  
(30-45cm)  
6-10 feet  
(1.8-3.3m)  
(1.83.3m) apart, so they form a triangle  
with the main listening area. Try to keep the  
speakers at least 12–18 inches (30–45cm)  
from the nearest reflective surface (side  
walls or ceiling). When used near a color  
television, the speakers should be mounted  
a minimum of 6 inches (150mm) from the  
TV to avoid interference with the picture.  
As a final check on the suitability of the  
mounting location, its a good idea to  
temporarily place a pair of small box  
speakers, if available, at the mounting  
locations chosen for the system. This will  
give the listener an approximate idea of  
what the speakers will sound like in that  
location. Listen for pleasing stereo image,  
realistic stage height or balanced surround-  
field coverage (if using the speakers as rear-  
channel surrounds). Note if any objects in  
the room impede the sound path from the  
speakers to the listening area.  
Outdoor Use  
The Designer Series is moisture- and  
temperature-resistant and may be used  
outdoors or in a marine setting. Placement  
under the eaves of a roof or in the cockpit  
of a boat reduces exposure to constant  
direct sunlight, precipitation and salt spray,  
thereby maximizing the speakers life.  
4
 
Painting the Speakers  
If you intend to paint the speakers, its best to  
do so before installation.  
1. Remove the speaker grille. Carefully pry at  
each corner with an awl or small screwdriver.  
2. Use the form-fitting painting mask provided  
to paint the housing. Cover the slots with  
masking tape.  
Use masking tape  
to cover slots.  
Boston  
3. After painting, remove the mask by carefully  
inserting a screwdriver into the slots. Do not  
puncture the drivers behind the mask with the  
screwdriver.  
4. When painting the grilles, be certain that the  
paint does not fill the perforated holes in the  
metal. If using spray paint, use two thin coats.  
If using house paint or other canned paint, thin  
the paint to avoid filling the holes.  
Boston  
Be sure to use appropriate exterior paint for  
outdoor applications.  
5
 
Preparing for Installation  
Map out the wiring paths from the speakers to the amplifier. We recommend 18-gauge wire for  
runs up to 25 feet, and 16-gauge or thicker for longer runs. Be sure the speaker wire does not rest  
or rub against any sharp or pointed objects.  
The speakers should be mounted on a flat surface to form a good seal between the speaker flange  
and the mounting surface.  
Each speaker is 8 ohms nominal. When connecting more than two speakers per amplifier channel,  
you should use series/parallel wiring or line transformers. In all cases, make certain that the total  
impedance does not fall below the amplifiers minimum rating. If you are not sure, contact your  
Boston Acoustics dealer.  
Use the cable clamp supplied to secure the speaker wire to the housing. Affix the clamp to one of  
the screws used to hold the printed circuit board to the housing.  
You Will Need  
1. A utility knife, electric jigsaw or other means of cutting a hole in the mounting surface.  
2. Phillips and flat-blade screwdrivers.  
3. A wire cutter or stripper for preparing the speaker wires.  
4. An awl or small screwdriver to remove the speaker grille.  
With the hardware supplied, the speaker can be installed in existing walls and ceilings from 38  
"
(9.5mm) to 112" (38mm) thick. For thinner walls, you will need to use spacers (not provided) for the  
mounting bracket. In walls greater than 112" (38mm) thick, you will need longer screws.  
Installation  
1. Make a cutout using the supplied template.  
BostonAcoustics  
BostonAcoustics  
BostonAcoustics  
351  
361  
HOLE CUTTING TEMPLATE  
of installation instructions.  
Cut hole to exact size of template. For details, see page  
6
381  
HOLE CUTTING TEMPLATE  
of installation instructions.  
834  
"
Cut hole to exact size of template. For details, see page  
6
HOLE CUTTING TEMPLATE  
of installation instructions.  
Cut hole to exact size of template. For details, see page  
6
978  
(251mm)  
"
(223mm)  
1134  
(298mm)  
"
534  
"
(146mm)  
718  
"
(181mm)  
812  
"
(216mm)  
2. Run wire from the amplifier to the cutout. Allow an extra foot of wire  
at the cutout. Strip 12" (12mm) off wire, and tightly twist the wire strands.  
6
 
3. Remove speaker grille. Carefully pry each corner  
with an awl or small screwdriver.  
Install barrier  
cloth for ceiling  
installations.  
4. Prepare the speaker/bracket assembly for instal-  
lation as shown.  
For new construction, an optional bracket  
(Model 35UB for the 351, Model 36CB for the 361,  
Model 38B for the 381) is available from your  
Boston Acoustics dealer.  
5. Route the speaker wire through the cable clamp  
and connect the wire to the speaker.  
WARNING: To prevent electrical shock hazard,  
always switch off the amplifier or receiver when  
making connections to the speaker.  
IMPORTANT: Typically, one side of the wire is  
smooth. Connect this side to the (black) speaker  
terminal. The other side has a rib or stripe. Connect  
this to the + (red) speaker terminal. Connect wire  
at the amplifier in the same way. Failure to do so  
will result in degraded sound.  
6. Install speaker according to diagram below.  
IMPORTANT: Do not overtighten screws. Doing so  
will break the frame and/or make it impossible to  
insert the grille.  
7
 
Listening Levels and Power-Handling  
The power recommendation for the speakers assumes that you will operate the amplifier in a way  
that will not produce distortion. Even our rugged speakers can be damaged by an amplifier if it is  
producing distortion.  
If you hear a harsh, gritty noise, turn down the volume. Prolonged or repeated operation of your  
speaker with a distorted signal from the amplifier can cause damage that is not covered by the  
warranty.  
Limited Warranty  
For one year from the date of purchase, Boston Acoustics will repair for the original owner any  
defect in materials or workmanship that occurs in normal use, without charge for parts and labor.  
Your responsibilities are to use the system according to the instructions supplied, to provide safe  
and secure transportation to an authorized Boston Acoustics service representative and to present  
proof of purchase in the form of your sales slip when requesting service.  
Excluded from this warranty is damage that results from abuse, misuse, accidents, shipping, or repairs  
or modifications by anyone other than an authorized Boston Acoustics service representative.  
This warranty is void if the serial number has been removed or defaced.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
If Service Seems Necessary  
First, contact the retailer from whom you purchased the speakers. If that is not possible, write to:  
Boston Acoustics, Inc., 300 Jubilee Drive, Peabody, MA 01960.  
We will promptly advise you of what action to take. If it is necessary to return your speaker to the  
factory, please ship it prepaid. After it has been repaired, we will return it freight prepaid in the U.S.  
and Canada.  
Kortec is a trademark and Boston and Boston Acoustics  
are registered trademarks of Boston Acoustics, Inc.  
Specifications subject to change without notice.  
300 Jubilee Drive  
Peabody, MA 01960  
© 1996 Boston Acoustics, Inc.  
508-538-5000  
42-353-4  
 

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