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251 Environmental Speaker 256033

The Bose

251™ Environmental Speaker is a premium environmental loudspeaker. Each loud-

speaker contains one 5.25" environmentally resistant woofer in a two-chamber configuration, two

2.5" environmentally resistant Twiddlers™ vertically stacked and angled for maximum horizontal

dispersion and a crossover including system protection. The system is packaged with mounting

brackets.

Transducers:

Impedance:

Power Handling:

Crossover Assembly:

System Protection:

Sensitivity:

Flux Leakage:

External Dimensions:

Weight:

1. Grille and Baffle Removal

1.1 Grasp the edge of the grill (5) and pull it

off.

1.2 Remove the six screws (13) that secure

the baffle to the cabinet and then pull off the

baffle.

2. Grille and Baffle Replacement

2.1 To prevent air leaks, apply a new baffle

woofer mount gasket (10). To prevent wire

buzzes, insert the wires into the cabinet's wire

channel. Line up the baffle so that the baffle's

woofer mount fits into the groove in the

cabinet. Replace the six screws (13) that

secure the baffle to the cabinet.

PRODUCT DESCRIPTION

SPECIFICATIONS

One 5.25" environmental woofer per enclosure

Two 2.5" environmental resistant Twiddlers per enclosure

6 Ohms nominal (4.8 Ohms minimum) 20-20 kHz

100W (24.5 Vrms) continuous per IEC 268-5

Recommended amp/receiver power 10-200W per channel.

Crossover frequency: 250 Hz, 10% at 6 dB/octave

System protection: PTC device.

>82 dB SPL (1W, 1M) 400 Hz octave band limited pink noise

NA, not shielded; not for use near a video monitor

13.5" x 5.75" x 8.34" (34.3 x 14.6 x 21.2) cm

7.75 lb. (3.5 kg)

DISASSEMBLY/ASSEMBLY PROCEDURES

(Refer to Figure 3)

2.2 Align the grille (5) with the cabinet so that

the logo (6) is over the Twiddlers (2). Press

the grille into place.

3. Twiddler Removal.

3.1 Perform procedure 1.1.

3.2 Remove the four screws (12) that secure

the Twiddler (2) to the cabinet.

3.3 Lift the Twiddler out and cut the wires as

close as possible to the wire terminal.

Note: Make a note of the wiring configuration.

4. Twiddler Replacement

4.1 Referring to the note taken in 3.3, attach

the wires to the Twiddler (2).