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Bose 251 Environmental Speakers

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About

Bose 251 Environmental SpeakersBose 251 Environmental Left / right CH speakers - 100 Watt

Bose - Outdoor - 2 Channel

Award-winning 251 environmental speakers let you enjoy rich, balanced stereo sound over a much wider area than most conventional outdoor speakers. And 251 environmental speakers are tough enough to beat the weather. These speakers connect to your stereo components or Lifestyle system and mount to your exterior walls. With conventional outdoor speakers, sound can only be heard with impact in a few "sweet spots" instead of the broader range of your patio, pool or yard. But Bose 251 envir... Read more

 

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User reviews and opinions

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Comments to date: 8. Page 1 of 1. Average Rating:
jvilca 4:53pm on Saturday, October 16th, 2010 
I had a pair of Bose 101 speakers outside for almost 10 years mounted on the deck, they performed perfectly, unfortunately being outside through Rain,... got these a couple of weeks ago from the bose store. they installed super easily, brackets sturdy and easy to place. the sound is phenomenal.
Sebastiaan Veld 6:53am on Monday, October 4th, 2010 
[...]the size of the speakers was bigger than expected but I had the space for it so not a problem. Sound quality was excellent. Great Product from Great store and good price Attractive Design, Easy To Connect, Great Sound Quality, Powerful
HHT 7:09am on Thursday, September 23rd, 2010 
Bose These are really great speakers. I use them in my work van. I have them on a 200 watt amp with a powered subwoofer. they sound great.
yesuto856 7:15pm on Friday, July 23rd, 2010 
OK so the Bose i bought them i saw them in a club years ago and OK. OK so the Bose i bought them i saw them in a club years ago and OK. I Own a club on the beach and use 12 of these for "fill in" to supplement the rest of the outdoor sound system.
getdeep 5:52am on Sunday, June 20th, 2010 
I Own a club on the beach and use 12 of these for "fill in" to supplement the rest of the outdoor...
wotm 1:37am on Sunday, May 23rd, 2010 
I liked the perfomance of this product at its size. Compact, Easy To Connect, Attractive Design, Compact, Great Sound Quality, Attractive Design.
rrb 1:33am on Friday, April 30th, 2010 
"These speakers are worth every penny. They make all music sound great. I have had them for 3 months and I love them." small, cool looking none
bsstmiller 10:34pm on Wednesday, April 21st, 2010 
I was very happy with the speakers as well as the knowledge of the sales personnel at the electronic warehouse.. Attractive Design, Crisp Sound.

Comments posted on www.ps2netdrivers.net are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.

 

Documents

doc0

The Bose 251TM Environmental Speakers OwOOwner
Owners Guide October 30, 2001

AM250811_04_V.pdf

For your records
Serial numbers are located on the label on the back of each 251TM environmental speaker. Serial numbers: Dealer name: Dealer phone: Purchase date: We suggest you keep your sales slip and warranty card together with this owners guide. and
DECLARATION OF CONFORMITY
We, the offerer: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA acknowledge our sole responsibility, that the product:

Kind of equipment:

Loudspeaker

Type designation:

251TM Environmental Speakers
in accordance with EMC Directive 89/336/EEC and Article 10(1) of the Directive, is in compliance with the following norm(s) or document(s): Technical regulations: EN50081-1, EN50082-1 Accredited by: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA

15 Jan. 2000

Bose Products B.V. Nijverheidstraat 8, 1135 GE Edam The Netherlands Nic Merks Vice President Europe Manufacturers authorized EU representative

October 30, 2001

Contents

Where to find

Setting Up Before you begin.... 4 Unpacking the carton.... 4 Tools required.... 4 Selecting the location for your speakers... 5 Installing Your 251TM Speakers Choosing the speaker wire... 6 Installing the mounting brackets... 6 Attaching the speakers to the brackets.. 8 Making the connections... 9 Maintaining Your 251TM 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

Setting Up

Before you begin
Thank you for purchasing Bose 251TM environmental speakers. These high-performance outdoor speakers are engineered to provide sound quality far beyond that of other environmental speakers. The 251 environmental speakers are designed to withstand natures 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 speakers 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: - A 332 inch diameter (2,5 mm) bit is preferred, or you can use a 18 inch diameter (3,0 mm) bit. For concrete, a 14 inch (6,0 mm) diameter masonry bit can be used. Eye and ear protection Dust mask
CAUTION: Failure to follow the instructions in this owners 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 owners guide completely before beginning installation.

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.) The 251TM 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 recommendations 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
Installing Your 251TM 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 recommendations 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
The 251TM 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 supplied 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. Vibration 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 (Figure 4). For wood, drill four starter holes using a 332 inch (2,5 mm) drill bit (Figure 5). For cement, drill four starter holes using a 14 inch (6,0 mm) drill bit (Figure 5).

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
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 (Figure 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

Installing the hardware A. Wood B. Concrete
32 inch (2.25 mm) inch (2.25 mm)
4 inch (6.35 mm) inch (2.25 mm)
Installing the brackets onto a deck railing or table
The 251TM 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 (Figure 8). Then, drill four starter holes using a 332 inch (2,5 mm) drill bit (Figure 9).

Figure 7

251 environmental speaker mounted onto a deck railing or t

Figure 8

Marking four holes on a deck railing or table

Figure 9

Drilling four holes on a deck railing or table
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
Note: If you are mounting your 251TM 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).

Installing Your 251 Speakers

Figure 11

Installing the knobs

two full rotations

Figure 12
Sliding the speakers into the brackets
Attaching the speakers to the brackets (cont.)

Figures 13A and 13B

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

2 inch (1.3 cm)

At the ends of each cord, strip approximately 12 inch (1.3 cm) of insulation from both wires (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

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).
Note: If your 251TM 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.
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).

Figures 18A and 18B

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

Rotating the Bose logo
Mounting the speakers on a deck railing or table will require you to rotate the Bose logo. Using your fingers, gently lift the logo, taking care not to detach it from the speaker, about 14 inch (.24 cm) and turn it 180.

Figure 20

Maintaining Your 251TM Speakers

Troubleshooting

Problem

Neither speaker plays

What to do
Check the settings on your receiver or amplifier. Refer to the owners guide that came with it for instruction on settings. If your 251TM 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. Check the tonal balance setting on your receiver or amplifier. Check the balance control on your receiver or amplifier and make sure its 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. 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 owners guide for a list of phone numbers.

The bass or treble is weak Only one speaker plays
Only one speaker still plays

Warranty period

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.

Customer service

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.

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

Two (2) 212" environmental TwiddlerTM drivers per speaker One (1) 514" environmental woofer per speaker

Enclosure

Dual-port molded polypropylene composite Black or white

Dimensions

1312" H x 534" W x 8" D (34.29 cm x 14.6 cm x 20.32 cm)

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 (-40F to 158F; -40C to 70C)

Wire recommendations

Based on a maximum frequency response deviation of 0.5 dB Gauge 18 (0.75 mm ) 16 (1.5 mm ) 14 (2.0 mm )

Weight

Length 30 ft (9 m) maximum 45 ft (14 m) maximum 70 ft (21 m) maximum

8 lb (3.63 kg) each

Bose Corporation
Bose Corporation, The Mountain Framingham, MA 01701-9168 1-800-367-4008 Phone hours - ET (eastern time): Weekdays 8:30 a.m. to 8 p.m. Saturdays 9 a.m. to 3 p.m.

Italia

Bose S.p.A., V ia della Magliana Roma www.bose.iT TEL 06-65670802 FAX 06-65680167
Bose K.K., Shibuya YT Building 28-3 Maruyama-cho Shibuya-ku, T okyo 150 TEL 3-5489-0955 FAX 3-5489-0592

Canada

Bose Ltd., 1-35 East Beaver Creek Road Richmond Hill, Ontario L4B 1B3 1-800-465-2673 Phone hours - ET (eastern time): Weekdays 9 a.m. to 5 p.m.

Nederland

Bose B.V., Nijver heidstraat GE Edam TEL 0299-390111 FAX 0299-390109

European Office

Bose Pr oducts B.V., Nijver heidstraat GE Edam, Nederland TEL 0299-390111 FAX 0299-390114
Bose A/S, Solheimsgate 11 N-2001, Lillestrm TEL 63-817380 FAX 63-810819

Australia

Bose Pty Limited, 1 Sorrell Street Par ramatta NSW , 2150 TEL 02 9204-6111 FAX 02 9204-6122

sterreich

Bose Ges.m.b.H., V ienna Business Park W ienerber gstrasse 7 (10.OG) A-1100 V ienna TEL 01-60404340 FAX 01-604043423

Belgique/Belgi

Bose N.V., Limesweg 2, B-3700 T onger en TEL 012-390800 FAX 012-390840

Danmark

Bose A/S, Industrivej 7, 2605 Brndby TEL 4343-7777 FAX 4343-7818

Schweiz

Bose AG, Rnenber 4460-Gelterkinden TEL 061-9815544 gerstrasse 13 FAX 061-9815502

Deutschland

Bose GmbH, Max-Planck-Strae 36d D-61381 Friedrichsdorf TEL 06172-71040 FAX 06172-710419

Sverige

Bose A/S, Johannefr S-43153 Mlndal TEL 31-878850 edsgatan 4 FAX 31-274891

France

Bose S.A., 6, r ue Saint V incent 78100 Saint Germain en Laye TEL 01-30616363 FAX 01-30614105

United Kingdom

Bose Limited 1 Ambley Gr een Gillingham Business Park Gillingham, Kent ME8 ONJ TEL 0870-741-4500 FAX 0870-741-4545
Bose Corporation India Private Limited W-16, Gr eater Kailash-II New Delhi TEL (011) FAX (011) 648 4463

From other locations

Bose Customer Ser vice, 1 New Y ork A ve. Framingham, MA 01701-9168 USA TEL (508) 766-1900 FAX (508) 766-1919

Ireland

Bose Corporation Carrickmacross,CoMonaghan TEL (042) 9661988 FAX (042) 9661998 AM250811_04_V.pdf

World Wide Web

www.bose.com
2000 Bose Corporation, The Mountain Framingham, MA 01701-9168 USA 250811 AM Rev.04 JN10679

doc1

T iP Fnl e b t te n lha d h D i u s oh h E gs n s cd i te rnhvro s fh d cme t h F c es n o ti ou n. e i s C P Fnl l vro s n lss e D i u e es n a g i ct s i ae e f na e d c d cme t tr i s e e ou n. a s
The Bose 251TM Environmental Speakers

Owners Guide

For your records
Serial numbers are located on the label on the back of each 251TM environmental speaker. Serial numbers: Dealer name: Dealer phone: Purchase date: We suggest you keep your sales slip and warranty card together with this owners guide. and
DECLARATION OF CONFORMITY
We, the offerer: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA acknowledge our sole responsibility, that the product:

Kind of equipment:

Loudspeaker

Type designation:

251TM Environmental Speakers
in accordance with EMC Directive 89/336/EEC and Article 10(1) of the Directive, is in compliance with the following norm(s) or document(s): Technical regulations: EN50081-1, EN50082-1 Accredited by: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA

15 Jan. 2000

Bose Products B.V. Nijverheidstraat 8, 1135 GE Edam The Netherlands Nic Merks Vice President Europe Manufacturers authorized EU representative

Contents

Where to find
Setting Up Before you begin.... 4 Unpacking the carton.... 4 Tools required.... 4 Selecting the location for your speakers... 5 Installing Your 251TM Speakers Choosing the speaker wire... 6 Installing the mounting brackets... 6 Attaching the speakers to the brackets.. 8 Making the connections... 9 Maintaining Your 251TM 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

Setting Up

Before you begin
Thank you for purchasing Bose 251TM environmental speakers. These high-performance outdoor speakers are engineered to provide sound quality far beyond that of other environmental speakers. The 251 environmental speakers are designed to withstand natures 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 speakers 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: - A 332 inch diameter (2,5 mm) bit is preferred, or you can use a 18 inch diameter (3,0 mm) bit. For concrete, a 14 inch (6,0 mm) diameter masonry bit can be used. Eye and ear protection Dust mask

CAUTION: Failure to follow the instructions in this owners 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 owners guide completely before beginning installation.
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.) The 251TM 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 recommendations 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
Installing Your 251TM 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 recommendations 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
The 251TM 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 supplied 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. Vibration 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 (Figure 4). For wood, drill four starter holes using a 332 inch (2,5 mm) drill bit (Figure 5). For cement, drill four starter holes using a 14 inch (6,0 mm) drill bit (Figure 5).

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
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 (Figure 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

Installing the hardware A. Wood B. Concrete
32 inch (2.25 mm) inch (2.25 mm)
4 inch (6.35 mm) inch (2.25 mm)
Installing the brackets onto a deck railing or table
The 251TM 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 (Figure 8). Then, drill four starter holes using a 332 inch (2,5 mm) drill bit (Figure 9).

Figure 7

251 environmental speaker mounted onto a deck railing or t

Figure 8

Marking four holes on a deck railing or table

Figure 9

Drilling four holes on a deck railing or table
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

Note: If you are mounting your 251TM 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).
Installing Your 251 Speakers

Figure 11

Installing the knobs

two full rotations

Figure 12
Sliding the speakers into the brackets
Attaching the speakers to the brackets (cont.)

Figures 13A and 13B

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

2 inch (1.3 cm)

At the ends of each cord, strip approximately 12 inch (1.3 cm) of insulation from both wires (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

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).
Note: If your 251TM 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.
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).

Figures 18A and 18B

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

Rotating the Bose logo
Mounting the speakers on a deck railing or table will require you to rotate the Bose logo. Using your fingers, gently lift the logo, taking care not to detach it from the speaker, about 14 inch (.24 cm) and turn it 180.

Figure 20

Maintaining Your 251TM Speakers

Troubleshooting

Problem

Neither speaker plays

What to do
Check the settings on your receiver or amplifier. Refer to the owners guide that came with it for instruction on settings. If your 251TM 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. Check the tonal balance setting on your receiver or amplifier. Check the balance control on your receiver or amplifier and make sure its 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. 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 owners guide for a list of phone numbers.

The bass or treble is weak Only one speaker plays
Only one speaker still plays

Warranty period

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.

Customer service

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.

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

Two (2) 212" environmental TwiddlerTM drivers per speaker One (1) 514" environmental woofer per speaker

Enclosure

Dual-port molded polypropylene composite Black or white

Dimensions

1312" H x 534" W x 8" D (34.29 cm x 14.6 cm x 20.32 cm)

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 (-40F to 158F; -40C to 70C)

Wire recommendations

Based on a maximum frequency response deviation of 0.5 dB Gauge 18 (0.75 mm ) 16 (1.5 mm ) 14 (2.0 mm )

Weight

Length 30 ft (9 m) maximum 45 ft (14 m) maximum 70 ft (21 m) maximum

8 lb (3.63 kg) each

2004 Bose Corporation The Mountain, Framingham, MA 01701-9168 USA 250811-ENGvo AM Rev.04

Notice dutilisation

 

Technical specifications

Full description

Award-winning 251 environmental speakers let you enjoy rich, balanced stereo sound over a much wider area than most conventional outdoor speakers. And 251 environmental speakers are tough enough to beat the weather. These speakers connect to your stereo components or Lifestyle system and mount to your exterior walls. With conventional outdoor speakers, sound can only be heard with impact in a few "sweet spots" instead of the broader range of your patio, pool or yard. But Bose 251 environmental speakers produce remarkably rich sound across a much wider listening area. Vital to that performance is Articulated Array speaker design, which houses two speakers set at precise angles in each enclosure. This produces an extremely wide sound field so that you experience consistent stereo effects as you move around outdoors. The small cabinets of conventional outdoor speakers often can't produce the low notes that provide impact. The 251 speakers blend with your outdoor surroundings, yet their technology and design eliminate the audible distortion often heard in other speakers. You can enjoy full, rich music without the need for large, bulky speakers.

General
Product TypeLeft / right channel speakers
Width5.7 in
Depth8 in
Height13.5 in
Weight7.9 lbs
Enclosure ColorWhite
Enclosure MaterialPolypropylene
Grille ColorWhite
Speaker System
System Components2 speakers
Speaker Type2-way - passive
Nominal (RMS) Output Power100 Watt
Input Impedance4/8 Ohm
Recommended Amplifier Power10 - 200 Watt
Output FeaturesBass Reflex
Connectivity TechnologyWired
Recommended PlacingOutdoor
Additional FeaturesWeather resistant
Speaker System Details
Speakers Included2 x right/left channel speaker - 2-way - 100 Watt - 4/8 Ohm - outdoor - wired
Driver DetailsRight/left channel speaker : 2 x full-range driver - 2.5" Right/left channel speaker : 1 x woofer driver - 5.25" - polymer composite
Miscellaneous
Included AccessoriesMounting hardware
Manufacturer Warranty
Service & Support5 years warranty
Service & Support DetailsLimited warranty - 5 years
Universal Product Identifiers
BrandBose
Part Numbers24644, 251 WHT
GTIN00017817263566

 

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