Bose 251 Bedienungsanleitung

OwOOwner

ltkje

The Bose

251

Environmental Speakers

Owner’sGuide

October30,2001

AM250811_04_V.pdf

2 October 30, 2001 AM250811_04_V.pdf

For your records…

Serial numbers are located on the label on the back of each 251

environmental 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.

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

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

Nic Merks

Vice President Europe

Manufacturer’s authorized EU

representative

Bose Products B.V.

Nijverheidstraat 8, 1135 GE Edam

The Netherlands

15 Jan. 2000

AM250811_04_V.pdf October 30, 2001 3

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

Contents

4 October 30, 2001 AM250811_04_V.pdf

Setting Up

Before you begin…

Thank you for purchasing Bose

251

environmental 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:

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

⁄

inch diameter (2,5 mm) bit is preferred, or you can use a

⁄

inch diameter (3,0 mm)

bit. For concrete, a

⁄

inch (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.

AM250811_04_V.pdf October 30, 2001 5

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 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 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 qualified professional installer.

Figure 2

Speaker placement guidelines

Setting Up

7 ft (2 m)

minimum space between

speakers

6 October 30, 2001 AM250811_04_V.pdf

Installing Your 251

Speakers

Installing the mounting brackets

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

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

⁄

inch (2,5 mm) drill bit (Figure 5). For

cement, drill four starter holes using a

⁄

inch (6,0 mm) drill bit (Figure 5).

Figure 4

Marking four holes on the

exterior of a house

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).

Figure 5

Drilling four holes on the

exterior of a house

Figure 3

251 environmental speaker

mounted onto the exterior of a

house

AM250811_04_V.pdf October 30, 2001 7

Installing Your 251

Speakers

Figures 6A and 6B

Installing the hardware

A. Wood

B. Concrete

A. B.

⁄

inch (2.25 mm)

⁄

inch (2.25 mm)

⁄

inch (2.25 mm)

⁄

inch (2.25 mm)

⁄

inch (6.35 mm)

⁄

inch (6.35 mm)

⁄

inch (2.25 mm)

⁄

inch (2.25 mm)

Figure 7

251 environmental speaker

mounted onto a deck railing or

Installing the brackets onto a deck railing or table

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

(Figure 8). Then, drill four starter holes using a

⁄

inch (2,5 mm) drill bit (Figure 9).

Figure 9

Drilling four holes on a deck

railing or table

Figure 8

Marking four holes on a deck

railing or table

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).

8 October 30, 2001 AM250811_04_V.pdf

Installing Your 251

™

Speakers

Figure 12

Sliding the speakers into the

brackets

Figure 10

Installing the bracket onto a

deck railing or table

Figure 11

Installing the knobs

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).

two full rotations

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).

Installing Your 251

Speakers

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.

AM250811_04_V.pdf October 30, 2001 9

Installing Your 251

Speakers

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

At the ends of each cord, strip approximately

⁄

inch (1.3 cm) of insulation from both wires

(Figure 14). Next, twist the ends of each wire so there are no loose strands.

A. B.

⁄

inch (1.3 cm)

Attaching the speakers to the brackets (cont.)

Figures 15

Unscrewing the hex knob

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.

10 October 30, 2001 AM250811_04_V.pdf

Installing Your 251

Speakers

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).

Figure 17

Connecting the speaker wire

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.

Figures 16A & 16B

Connecting the speaker wire

A. Exterior of a house

B. Deck railing or table

A. B.

Attaching the speakers to the brackets (cont.)

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.

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