Bose Speaker 251 BLACK User Manual

®
TM  
The Bose 251 Environmental Speakers  
Owner’s Guide  
Brugervejledning  
Bedienungsanleitung  
Guía del usuario  
Notice d’utilisation  
Manuale di istruzioni  
Gebruiksaanwijzing  
Bruksanvisning  
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Contents  
Where to find…  
Setting Up  
Before you begin........................................................................................................... 4  
Unpacking the carton.................................................................................................... 4  
Tools required................................................................................................................ 4  
Selecting the location for your speakers....................................................................... 5  
TM  
Installing Your 251 Speakers  
Choosing the speaker wire............................................................................................ 6  
Installing the mounting brackets................................................................................... 6  
Attaching the speakers to the brackets ........................................................................ 8  
Making the connections................................................................................................ 9  
TM  
Maintaining Your 251 Speakers  
Troubleshooting........................................................................................................... 12  
Warranty period........................................................................................................... 12  
Customer service ........................................................................................................ 12  
Cleaning your speakers............................................................................................... 12  
Protecting the speaker wire......................................................................................... 12  
Product Information  
Technical information .................................................................................................. 13  
®
Bose Corporation.....................................................................................inside back cover  
3
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Setting Up  
Before you begin…  
®
TM  
Thank you for purchasing Bose 251 environmental speakers. These high-performance out-  
door speakers are engineered to provide sound quality far beyond that of other environmental  
speakers. The 251 environmental speakers are designed to withstand nature’s elements – so  
you can be confident they will perform for years to come.  
Unpacking the carton  
Carefully unpack your speakers and save all packing materials for possible future use. Check  
that your system contains the parts identified in Figure 1. Do not attempt to use your speak-  
ers if any part of them appears damaged. Instead, notify Bose Corporation or your authorized  
Bose dealer immediately.  
WARNING: To avoid danger of suffocation, keep the plastic bags out of the reach of children.  
Figure 1  
Packaging contents:  
Two 251 speakers  
Two mounting brackets  
• Mounting hardware (8 screws  
and 8 plastic anchors)  
• Six rubber feet  
• Four knobs  
• One owner’s guide  
Tools required  
You need the following items to complete this installation:  
• Speaker wire (see “Wire recommendations” on page 13)  
• Phillips-head screwdriver (#2)  
• A drill with the following bits:  
3
1
- A ⁄ inch diameter (2,5 mm) bit is preferred, or you can use a ⁄ inch diameter (3,0 mm)  
32  
8
1
bit. For concrete, a ⁄ inch (6,0 mm) diameter masonry bit can be used.  
4
• Eye and ear protection  
• Dust mask  
CAUTION: Failure to follow the instructions in this owner’s guide voids all warranties on your  
speakers. If you are unsure of your ability to complete this process, consult a professional installer.  
Please read this owner’s guide completely before beginning installation.  
4
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Setting Up  
Selecting the location for your speakers  
For best results, mount both speakers on the same wall, facing the listening area. Make sure  
they do not face each other. (Outdoors, if you are not using an existing wall, consider the  
length of your listening area as your “wall.”)  
TM  
The 251 speakers should be placed at least 7 feet (2 m) apart.  
Please consider the following before mounting your speakers:  
• Measure the length of speaker wire you need to connect each speaker to your receiver  
or amplifier. To determine the wire gauge you will need, refer to the “Wire recom-  
mendations” on page 13.  
• It is important that the speaker wire not be tripped over, pinched, or pulled. Determine  
the best route to protect the wire.  
CAUTION: Do not mount on surfaces that are not sturdy enough, or that have hazards concealed  
behind them, such as plumbing or electrical wire. If you are unsure about installing these speakers,  
contact a qualified professional installer.  
• Regardless of where you place your speakers, make sure they cannot fall and cause  
injuries.  
®
• Bose 251 speakers are not magnetically shielded. Keep them at least 9 inches (23 cm)  
from any video screen or monitor.  
Note: This product is not intended for use in areas where it will be subject to high vibration. If you  
are unsure about installing these speakers, contact a qualified professional installer.  
Figure 2  
Speaker placement guidelines  
7 ft (2 m)  
minimum space between  
speakers  
5
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TM  
Installing Your 251 Speakers  
Choosing the speaker wire  
Be sure to use the proper gauge (thickness) of speaker wire. Standard zip cord (2-conductor,  
18-gauge wire found at electrical and hardware stores) works for most applications. If your  
speakers will be more than 30 feet (9 m) from the receiver or amplifier, see the “Wire recom-  
mendations” under “Technical Information” on page 13. Or check with your authorized Bose  
dealer.  
®
If you decide to run the speaker wire through a wall or underground, check your local building  
code requirements, or contact an electrical installer before proceeding.  
Note: Be sure to cut enough wire to reach from the receiver to each speaker.  
CAUTION: Before making any connections, turn off your receiver or amplifier and unplug it from  
the outlet (the AC power mains).  
Installing the mounting brackets  
TM  
The 251 speakers should be mounted using the supplied brackets. They can be mounted  
onto the exterior of a house or onto a deck railing or table. If you choose not to use the sup-  
plied brackets, be sure to position your 251 speakers on a sturdy surface.  
CAUTION: If you do not use the supplied brackets, choose a level surface for the speakers. Vibra-  
tion can cause the speakers to move, so it is important that you install the supplied rubber feet  
before using the speakers on a surface. Refer to “Attaching the rubber feet” on page 11.  
Installing the brackets onto the exterior of a house  
The 251 speakers should be mounted in a vertical position to achieve the best musical  
performance. Figure 3 illustrates how the mounted speaker will look once the installation is  
complete. To begin, mark four holes to indicate where you want to install the speaker bracket  
3
(Figure 4). For wood, drill four starter holes using a ⁄ inch (2,5 mm) drill bit (Figure 5). For ce-  
32  
1
ment, drill four starter holes using a ⁄ inch (6,0 mm) drill bit (Figure 5).  
4
Figure 3  
251 environmental speaker  
mounted onto the exterior of a  
house  
Figure 4  
Marking four holes on the exterior  
of a house  
Figure 5  
Drilling four holes on the exterior  
of a house  
6
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TM  
Installing Your 251 Speakers  
Installing the mounting brackets (cont.)  
Installing the brackets onto the exterior of a house (cont.)  
For mounting onto wood, install the supplied screws using a Phillips-head screwdriver (Fig-  
ure 6A). For concrete use, first install the supplied plastic inserts. Then, using a Phillips-head  
screwdriver, install the screws (Figure 6B).  
Figures 6A and 6B  
A.  
B.  
Installing the hardware  
A. Wood  
B. Concrete  
3
1
⁄ inch (2.25 mm)  
⁄ inch (6.35 mm)  
32  
4
1
1
1 ⁄ inch (2.25 mm)  
1 ⁄ inch (2.25 mm)  
2
2
3
1
⁄ inch (2.25 mm)  
⁄ inch (6.35 mm)  
32  
4
1
1
1 ⁄ inch (2.25 mm)  
1 ⁄ inch (2.25 mm)  
2
2
Installing the brackets onto a deck railing or table  
TM  
The 251 speakers should be mounted in a vertical position to achieve the best musical  
performance. Figure 7 illustrates how the mounted speaker will look once the installation is  
complete. To begin, mark four holes to indicate where you want to install the speaker bracket  
3
(Figure 8). Then, drill four starter holes using a ⁄ inch (2,5 mm) drill bit (Figure 9).  
32  
Figure 7  
251 environmental speaker  
mounted onto a deck railing or  
table  
Figure 8  
Marking four holes on a deck  
railing or table  
Figure 9  
Drilling four holes on a deck rail-  
ing or table  
7
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TM  
Installing Your 251 Speakers  
Installing the mounting brackets (cont.)  
Installing the brackets onto a deck railing or table (cont.)  
Finally, install the four screws using a Phillips-head screwdriver (Figure 10).  
Figure 10  
Installing the bracket onto a deck  
railing or table  
TM  
Note: If you are mounting your 251 speakers on a deck railing or table, you will need to rotate the  
Bose logo. Refer to “Rotating the Bose logo” on page 11 for instructions on how to do this.  
Attaching the speakers to the brackets  
Once the brackets are installed, carefully follow these steps to attach the speakers to the  
brackets. First, insert the knobs into each side of the speakers. Be sure to turn each knob two  
full rotations (Figure 11). Then, carefully slide the speakers into the brackets (Figure 12). Finally,  
temporarily tighten the speaker in a position that will allow you to easily connect the speaker  
wire (Figures 13A and 13B).  
Figure 11  
Installing the knobs  
two full rotations  
Figure 12  
Sliding the speakers into the  
brackets  
8
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TM  
Installing Your 251 Speakers  
Attaching the speakers to the brackets (cont.)  
B.  
Figures 13A and 13B  
A.  
Temporarily tighten the speakers  
to the brackets  
A. Exterior of the house  
B. Deck railing or table  
Making the connections  
Preparing the speaker wire (not provided)  
Speaker cord consists of two insulated wires. The insulation around one wire is striped,  
collared, or ribbed. This marked wire is positive (+). The plain wire is negative (–). These  
correspond to the red (+) and black (–) terminals on the back of the speaker, receiver, or  
amplifier. Be sure to connect each wire to the proper terminal (positive to positive, negative  
to negative).  
Figure 14  
Preparing the ends of each wire  
1
⁄ inch (1.3 cm)  
2
1
At the ends of each cord, strip approximately ⁄ inch (1.3 cm) of insulation from both wires  
2
(Figure 14). Next, twist the ends of each wire so there are no loose strands.  
Connecting the speaker wire to the speakers  
At the back of your speaker, unscrew the hex knobs on the terminal posts. This reveals a  
small opening through each post (Figure 15). Using the wire guides, insert the marked wire  
into the red (+) terminal. Then insert the plain wire into the black (–) terminal. Tighten the  
knobs to secure the wires. See Figures 16A and 16B on page 10.  
Figures 15  
Unscrewing the hex knob  
9
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TM  
Installing Your 251 Speakers  
Attaching the speakers to the brackets (cont.)  
A.  
B.  
Figures 16A & 16B  
Connecting the speaker wire  
A. Exterior of a house  
B. Deck railing or table  
Connecting the speaker wire to the receiver or amplifier  
1. Connect the speakers on the left side of the listening area to the left channel of your  
receiver or amplifier (Figure 17).  
a. Attach the marked wire to the red (+) terminal.  
b. Attach the plain wire to the black (–) terminal.  
2. Connect the speaker on the right side of the listening area to the right channel of your  
receiver or amplifier, following the same procedure above (Figure 17).  
TM  
Note: If your 251 speakers are being connected as a secondary set of speakers to your receiver  
or amplifier, be sure to make the appropriate connections to the “B” channel.  
Figure 17  
Connecting the speaker wire  
Checking the connections  
Check the speaker connections carefully. Make sure no loose strands of wire touch across  
terminals. This could create short circuits that can damage an amplifier or receiver.  
Tighten any loose connections before you plug in the receiver or amplifier.  
Testing the connections  
To make sure your speakers operate correctly, follow these steps:  
1. Set the balance control on your receiver or amplifier to normal (centered).  
2. Play some deep bass passages of music through the speakers.  
The sound should seem to come from a point between the two speakers. The bass should  
be full and natural. If not, your connections may be reversed, causing the speakers to play  
out of phase. Refer to “Making the connections” on page 9. To correct the problem, make  
sure all the wires are connected positive to positive (+ to +) and negative to negative (– to –).  
Then repeat steps 1 and 2 to re-test the speakers.  
10  
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TM  
Installing Your 251 Speakers  
Making the connections (cont.)  
Putting the speakers in the final location  
Loosen the knobs on each speaker to rotate the speakers into the desired position. Then,  
tighten the knobs to secure the speaker in its final position (Figures 18A and 18B).  
A.  
Figures 18A and 18B  
B.  
Putting the speaker in the final  
position  
A. Exterior of the house  
B. Deck railing or table  
Attaching the rubber feet  
If you do not plan to use the supplied brackets to mount your 251 environmental speakers, you  
can place them on a sturdy, level surface. They should be standing in the vertical position. Be  
sure to attach the rubber feet before using your speakers. For proper balance be sure to place  
the feet in the position shown in Figure 19.  
Figure 19  
Attaching the rubber feet  
Rotating the Bose logo  
Mounting the speakers on a deck railing or table will require you to rotate the Bose logo. Using  
1
your fingers, gently lift the logo, taking care not to detach it from the speaker, about ⁄ inch (.24  
4
cm) and turn it 180º.  
Figure 20  
Rotating the Bose logo  
11  
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TM  
Maintaining Your 251 Speakers  
Troubleshooting  
Problem  
What to do  
Neither speaker plays  
• Check the settings on your receiver or amplifier. Refer to the owner’s guide that came with  
it for instruction on settings.  
TM  
• If your 251 speakers are connected as a second set of speakers to your receiver or  
amplifier, check that the connections have been made to the “B” terminals and that  
the “B” speakers are selected to play.  
The bass or treble is weak  
Only one speaker plays  
• Check the tonal balance setting on your receiver or amplifier.  
• Check the balance control on your receiver or amplifier and make sure it’s centered.  
• Check the wires connected to the speaker that does not play. Make sure the wires are in  
good condition and are firmly connected. Review the “Making the connections” section on  
page 9.  
Only one speaker still plays  
• Disconnect the working speaker from the receiver or amplifier.  
• Switch the cord of the “faulty” speaker from its original receiver or amplifier jacks to the  
other set of jacks (the working speaker was originally attached to those jacks).  
- If the speaker now works, the problem is in your receiver or amplifier. Reconnect your  
speakers to a working unit.  
- If there is still no sound from the speaker, continue below.  
• Remove the cord from the working speaker and connect it to the “faulty” speaker.  
- If the speaker now works, the problem was in the original speaker cord.  
- If there is still no sound, the problem is in the speaker.  
®
• If trouble persists, contact your authorized Bose dealer, who will arrange for service. Or,  
contact Bose customer service. See the inside back cover of this owner’s guide for a list of  
phone numbers.  
Warranty period  
Customer service  
Bose 251 environmental speakers are covered by a limited five-year transferable warranty.  
Details of coverage are on the warranty card that came with your speakers. Please fill out the  
information section, detach, and mail it to Bose.  
For additional help in solving problems, contact Bose Customer Service. See the inside back  
cover for offices and phone numbers.  
Cleaning your speakers  
Use a cloth dampened in mild detergent and water to remove dust or dirt from the outside  
of your 251 speakers. Or use a hose to rinse them thoroughly with fresh water. Do not use  
enough pressure to force water behind the grille and into the drivers or the acoustic ports.  
Protecting the speaker wire  
The bare ends of the speaker cord can be affected by exposure to the elements. This is  
especially true of saltwater exposure. You may use a silicone caulking material, such as RTV  
adhesive, to protect the connections. It is commonly available at hardware stores. If you do  
use caulking, apply it only after the wires are connected and the knobs tightened down.  
Check the connections annually, and reapply as needed.  
12  
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Product Information  
Technical Information  
Protective features  
• Galvanized powder coated steel grille  
• Environmentally resistant hardware  
• Polymer fiber composite drivers  
• Nickel-plated brass connection terminals  
®
• Syncom computer quality control  
Driver complement  
1
TM  
Two (2) 2” environmental Twiddler drivers per speaker  
2
1
• One (1) 5” environmental woofer per speaker  
4
Enclosure  
• Dual-port molded polypropylene composite  
• Black or white  
Dimensions  
1
3
• 13” H x 5” W x 8” D (34.29 cm x 14.6 cm x 20.32 cm)  
2
4
Compatibility  
• Compatible with amplifiers or receivers rated 10-200 watts per channel/rated 4 to 8 ohms  
• 100W IEC continuous power handling; rated 6 ohms  
Environmental Capabilities  
• Designed to withstand:  
– salt fog, sun, high humidity (100%RH)  
– temperature extremes (-40°F to 158°F; -40°C to 70°C)  
Wire recommendations  
• Based on a maximum frequency response deviation of ±0.5 dB  
Gauge  
Length  
2
18 (0.75 mm)  
30 ft (9 m) maximum  
45 ft (14 m) maximum  
70 ft (21 m) maximum  
2
16 (1.5 mm)  
2
14 (2.0 mm)  
Weight  
• 8 lb (3.63 kg) each  
13  
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© 2008 Bose Corporation, The Mountain  
Framingham, MA 01701-9168 USA  
AM250811 Rev.06  
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