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The Bose _ 251 _ Environmental Speakers Owner's Guide October 30 , 2001 AM250811 04 V . pdf
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For your records . . . Serial numbers are located on the label on the back of each 251TMenvironmental speaker . Serial numbers : and Dealer name : Dealer phone : Purchase date : We suggest you keep your sales slip and warranty card together with this owner's guide . 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 . Nic Merks Nijverheidstraat 8 , 1135 GE Edam Vice President Europe The Netherlands Manufacturer's authorized EU representative 2 October 30 , 2001 AM25081 l _ 04 _ V . pdf
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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 251TMSpeakers Choosing the speaker wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Installing the mounting brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Attaching the speakers to the brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Making the connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Maintaining Your 251TMSpeakers 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 AM25081 l _ 04 _ V . pdf October 30 , 2001 3
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Before you begin . . . Thank you for purchasing Bose ® 251TMenvironmental speakers . These high - performance outdoor speakers are engineered to provide sound quality far beyond that of other environ - mental 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 autho - rized Bose dealer immediately . , _ WARNING : Toavoid danger of suffocation , keep the plastic bags out of the reach of children . . . . . Figure I 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 _ / 32inch diameter ( 2,5 mm ) bit is preferred , or you can use a 1 / 8inch diameter ( 3,0 mm ) bit . For concrete , a 1 / 4inch ( 6,0 mm ) diameter masonry bit can be used . • 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 October 30 , 2001 AM25081 l _ 04 _ V . pdf
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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 251TMspeakers 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 install - ing 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 quafified professional installer . Figure 2 Speaker placement guidelines AM25081 l _ 04 _ V . pdf October 30 , 2001 5
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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 The 251TMspeakers 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 speak - ers . 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 3 / 32inch ( 2,5 mm ) drill bit ( Figure 5 ) . For cement , drill four starter holes using a 1 / 4inch ( 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 6 October 30 , 2001 AM25081 l _ 04 _ V . pdf
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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 ) . A . g . Figures 6A and 6B Installing the hardware A . Wood B . Concrete Installing the brackets onto a deck railing or table The 251T _ 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 3 / 32inch ( 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 AM25081 l _ 04 _ V . pdf October 30 , 2001 7
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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 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 full rotations Figure 12 Sliding the speakers into the brackets 8 October 30 , 2001 AM25081 l _ 04 _ V . pdf
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Attaching the speakers to the brackets ( cont . ) B . Figures 13A and 13B A . Temporarily tighten the speakers to the ebrackets A . Exterior of the hous 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 _ / zinch ( 1.3 cm ) At the ends of each cord , strip approximately 1 / £ 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 Unscrewingthe hex knob AM25081 l _ 04 _ V . pdf October 30 , 2001 9
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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 ) . 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 October 30 , 2001 AM25081 l _ 04 _ V . pdf
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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 ) . g . Figures 18A and 18B A . 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 posi - tion . 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 your fingers , gently lift the logo , taking care not to detach it from the speaker , about 1 / 4 inch ( . 24 cm ) and turn it 180 ° . Figure 20 Rotating the Bose logo AM25081 l _ 04 _ V . pdf October 30 , 2001 11
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Troubleshooting Problem What to do Check the settings on your receiver or amplifier . Refer to the owner's guide that came with Neither speaker plays it for instruction on settings . If your 251T " 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 • Check the tonal balance setting on your receiver or amplifier . Only one speaker plays • 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 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 . 12 October 30 , 2001 AM25081 l _ 04 _ V . pdf
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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 ) 21 / 2 " environmental Twiddler TM drivers per speaker • One ( 1 ) 51 / 4 ' ' environmental woofer per speaker Enclosure • Dual - port molded polypropylene composite • Black or white Dimensions • 131 / 2 " H x53 / 4 ' ' Wx8 " D ( 34.29cm x 14.6cmx20.32 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 ( - 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 18 ( 0.75 mm2 ) 30 ft ( 9 m ) maximum 16 ( 1.5 mm2 ) 45 ft ( 14 m ) maximum 14 ( 2.0 mm _ ) 70 ft ( 21 m ) maximum Weight • 8 Ib ( 3.63 kg ) each AM25081 l _ 04 _ V . pdf October 30 , 2001 13
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14 Octobe3r 0,2001 AM2508l _ 104 _ V . pdf
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Italia USA Bose C _ ortxx _ on , The Mountain Bose S . p . A . , Via della Magliam 876 00148Roma Fra _ mingham , MA01701 - 9168 1 - 800 - 367 - 4008 . bose . iT TEL 06 - 65670802 FAX 06 - 65680167 Phone hours - ET ( easternlime ) : Weekdays 8 : 30a.rrt to 8p.m . Satudays 9a.rrt to 3p.m . Japan Bose K . I < L , Shibuya YT Building Canada 28 - 3 Mamyama - cho Bose Ltd . , 1 - 35 East Beaver Creek Road Shibuya - ku , T okyo 150 TEL 3 - 5489 - 0955 FAX 3 - 5489 - 0592 Richmond Hill , Ontario L4B 1B3 1 - 800 - 465 - 2673 Phone hours - ET ( eaaem lime ) : Nederland Weekdays 9 a . rrt to 5p.m . Bose B . V . , Nijver heidstraat 8 1135GE Fxlam European Office TEL 0299 - 390111 FAX 0299 - 390109 BoselS - oductsB . V . , Nijverhddswaat8 1135GE FAam , Nederland Norge TEL 0299 - 390111 FAX 0299 - 390114 A ! S , Solhdmsgate 11 N - 2001 , Lillestrom Australia TEL 63 - 817380 FAX 63 - 810819 BosePtyLimited , 1SorrellSUeet C ) sterreich Par mmaltaNSW , 2150 TEL 02 9204 - 6111 FAX 02 9204 - 6122 iennaBusinessPakW Bose Gesrn . b . H . , V ien _ " _ 7 ( 10 . OG ) Belgique / Belgi _ A - 1100Vienna TEL 01 - 60404340 FAX 01 - 604043423 BoseN . V . , Limesweg2 , B - 3700T onger en TEL 012 - 390800 FAX 012 - 390840 Schweiz Danmark BoseAG , Raaenber gerslmssel3 4460 - Gelteakinden Bose A / S , lndustrivej 7 , 2605 Bl _ andby TEL 4343 - 7777 FAX 4343 - 7818 TEL 061 - 9815544 FAX061 - 9815502 Deutschland Sverige Bose GmbH , Max - Planck - Slral3e36d BoseAN , Jol - ameti " _ gatan4 D - 61381 Friedrichsdorf S - 43153M61ndal TEL 06172 - 71040 FAX06172 - 710419 TEL 31 - 878850 FAX 31 - 274891 France United Kingdom Bose Limited BoseS . A . , 6 , r ueSaJntV incent 78100SaintGermainenLaye 1AmbleyGr een TEL 01 - 30616363 FAX01 - 30614105 Gillingham Business Park Gillingham , Kent ME80NJ TEL 0870 - 741 - 4500 FAX 0870 - 741 - 4545 India Bose Corporation IndiaPrivate Limited From other locations W - 16 , Gr eater Kailash - ll New Delhi 110 048 BoseCustomea'Ser vice , 1NewY olkA ve . TEL ( 011 ) 648 4462 FAX ( 011 ) 648 4463 Framingham , MA 01701 - 9168USA TEL ( 508 ) 766 - 1900 FAX ( 508 ) 766 - 1919 Ireland World Wide Web _ _ on . _ . _ Carickmacaws , Co Mmagl'k _ TEL ( 042 ) 9661988 FAX ( 042 ) 9661998 AM25081 l _ 04 _ V . pdf October 30 , 2001 15
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aett _ . _ ur _ # rou _ re _ ar _ ® © 2000 Bose Corporation , The Mountain Framingham , MA 01701 - 9168 USA9 250811 AM Rev . 04 JN1067