Bose 251 Speaker Manual

The Bose 251 Environmental Speakers are designed for outdoor use, featuring weather-resistant construction, Articulated Array speaker design for wide sound dispersion, and durable materials to withstand various weather conditions. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Connections 6. Connecting to Audio Sources 7. Optimal Placement 8. Weather Resistance & Care 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Weather-resistant enclosure, Articulated Array speaker design, corrosion-resistant grille, integrated mounting bracket, and high-quality speaker terminals.

Feature	Description
Articulated Array design	Provides wide, even sound coverage outdoors
Weather-resistant construction	Designed to withstand sun, rain, salt, and temperature extremes
Corrosion-resistant grille	Stainless steel or powder-coated metal for durability
Integrated mounting bracket	Allows for easy wall, ceiling, or ground mounting
High-quality terminals	5-way binding posts for secure wire connections
Wide dispersion	Optimized for open outdoor spaces

Installation

Unpack and inspect contents. Choose a suitable outdoor location.

Select mounting location: Ensure surface is stable and can support speaker weight.
Mount bracket: Use provided hardware to attach bracket to wall, ceiling, or ground stake.
Connect speaker wires: Strip insulation, connect to 5-way binding posts (observe polarity).
Secure speaker: Attach speaker to mounting bracket and tighten.
Route wires safely: Use weatherproof conduit if necessary to protect wires.

WARNING! Ensure all electrical connections are made with amplifier turned off. Use only outdoor-rated speaker wire.

First-Time Setup

After installation, configure with your audio system.

Connect to amplifier: Ensure amplifier is compatible with speaker impedance (typically 4-8 ohms).
Check polarity: Match positive (+) and negative (-) terminals on amplifier and speakers.
Test sound: Play audio at low volume to verify proper connection and sound output.
Adjust placement: Fine-tune speaker angle for optimal sound coverage in your space.

CAUTION! Do not exceed amplifier's recommended power output to avoid speaker damage.

Specifications

Type: 2-way outdoor environmental speaker
Drivers: Dual 2.5" full-range drivers, 1" tweeter (Articulated Array)
Impedance: 4-8 ohms
Power Handling: 10-100 watts per channel
Frequency Response: 55Hz - 20kHz
Dimensions: Approximately 10.5" H x 6.5" W x 5.5" D
Weight: Approximately 4.5 lbs (2 kg) each
Enclosure: Weather-resistant, UV-resistant composite
Mounting: Integrated bracket for wall, ceiling, or ground
Warranty: Limited warranty - refer to Bose documentation

Controls and Connections

Speakers are passive; control via connected amplifier/receiver.

Speaker Terminals: 5-way binding posts accept bare wire, spade lugs, banana plugs, or pin connectors.

Amplifier Requirements: Stereo or multi-channel amplifier with appropriate power rating. Volume, tone, and source selection controlled at amplifier.

Wire Gauge: Use 16-gauge or thicker outdoor-rated speaker wire for runs up to 50 feet; thicker for longer runs.

Connecting to Audio Sources

Connect speakers to amplifier/receiver using proper speaker wire.

Turn off and unplug amplifier before making connections.
Strip 1/2 inch of insulation from wire ends.
Connect to binding posts: Loosen posts, insert wire, tighten securely.
Connect to amplifier: Match polarity (positive to positive, negative to negative).
Secure wire routing: Protect wires from weather and physical damage.

Tip: Use weatherproof wire connectors or sealant for outdoor connections.

Optimal Placement

For best sound quality in outdoor environments:

Mount at ear level: Approximately 5-8 feet high for seated listening.
Angle speakers: Point toward listening area using adjustable bracket.
Maintain symmetry: Place left and right speakers equidistant from primary listening position.
Consider reflections: Avoid placing directly against solid walls if possible.
Protect from elements: While weather-resistant, partial overhead protection can extend lifespan.
Ground mounting: Use optional ground stakes for patio or garden installation.

WARNING! Do not mount where speakers will be submerged in water or exposed to direct high-pressure water spray.

Weather Resistance & Care

Designed for outdoor use but requires proper care.

Cleaning: Use soft cloth with mild soap and water. Do not use abrasive cleaners or high-pressure water.

Winter Care: Speakers can withstand freezing temperatures but avoid ice buildup on grille.

Long-term Storage: If removing for season, store in dry, temperature-controlled area.

CAUTION! While weather-resistant, not waterproof. Do not install in locations with constant direct water exposure.

Regulatory Information

FCC Compliance: This device complies with Part 15 of FCC rules. Copyright © Bose Corporation. All rights reserved. Bose and the Bose logo are trademarks of Bose Corporation. For support, visit www.bose.com or contact Bose Customer Service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speaker	Amplifier off/incorrect input	Check amplifier power and source selection; verify volume setting.
Distorted sound	Overdriven amplifier	Reduce volume on amplifier; check amplifier power rating.
One speaker not working	Wire connection	Check wire connections at both speaker and amplifier; test with known working speaker.
Intermittent sound	Loose connection/corrosion	Tighten binding posts; check for corrosion on wire ends; replace if corroded.
Reduced bass response	Placement/wire gauge	Reposition speaker; ensure adequate wire gauge for distance.
Physical damage	Impact/weather	Inspect for cracks or water intrusion; contact Bose support if damaged.

Service: For product service, contact Bose Customer Service or visit www.bose.com.