Bose 251 Environmental Speakers 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 environmental 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. Operation Guidelines 8. Weather Resistance Features 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Weather-resistant enclosure, Articulated Array® speaker design, stainless steel hardware, integrated mounting brackets, and speaker wire terminals.

Feature	Description
Articulated Array® design	Provides wide, even sound coverage outdoors
Weather-resistant construction	Designed to withstand rain, snow, sun, and salt air
Stainless steel hardware	Corrosion-resistant for long-term outdoor use
Integrated mounting brackets	For easy wall, ceiling, or deck installation
Speaker wire terminals	5-way binding posts for secure connections
UV-resistant materials	Protects against sun damage and fading
Wide frequency response	Delivers clear highs and full bass outdoors
High power handling	Compatible with most home audio amplifiers
Dual driver design	Two drivers per speaker for balanced sound
Adjustable angle brackets	Allows precise aiming of sound direction

Installation

Unpack and inspect contents. Choose appropriate outdoor location.

Select mounting location: Choose wall, ceiling, or deck area with proper support.
Prepare mounting surface: Ensure surface is clean, dry, and structurally sound.
Attach mounting brackets: Use provided stainless steel screws and anchors.
Connect speaker wires: Strip wires, connect to 5-way binding posts (observe polarity).
Secure speakers: Attach speakers to brackets and tighten securely.
Route wires properly: Use weatherproof conduit if wires are exposed to elements.

WARNING! Ensure mounting surface can support speaker weight. Use proper tools and safety equipment during installation.

First-Time Setup

Connect to audio system and test operation.

Connect to amplifier: Use 16-gauge or thicker speaker wire for best performance.
Check polarity: Ensure positive/negative connections match amplifier terminals.
Set amplifier volume: Start at low volume and gradually increase.
Test sound quality: Play audio source to verify proper operation.
Adjust speaker angle: Position Articulated Array for optimal sound coverage.
Secure wire connections: Ensure all connections are tight and weather-protected.

CAUTION! Do not exceed amplifier's power rating. Ensure all electrical connections are made with power off.

Specifications

Speaker Type: 2-way environmental loudspeaker system
Recommended Amplifier Power: 10-100 watts per channel
Impedance: 4-8 ohms compatible
Frequency Response: 55Hz - 20kHz
Driver Complement: Two 4.5" drivers per speaker
Enclosure Material: Weather-resistant polymer
Grille Material: Powder-coated, perforated steel
Mounting Options: Wall, ceiling, deck, or surface mount
Dimensions: 12.5" H x 8.5" W x 6.5" D (per speaker)
Weight: 6.5 lbs per speaker
Operating Temperature: -40°F to 150°F (-40°C to 65°C)

Controls and Connections

No active controls on speakers. All control via connected amplifier/receiver.

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

Amplifier Requirements: Compatible with most home audio amplifiers and receivers. Ensure amplifier is rated for 4-8 ohm speakers.

Wire Gauge Recommendations: Use 16-gauge wire for runs up to 50 feet, 14-gauge for longer runs.

Connecting to Audio Sources

Connect speakers to amplifier/receiver using proper speaker wire.

Turn off amplifier power before making connections.
Strip 1/2 inch of insulation from wire ends.
Connect positive (+) terminal on amplifier to positive (+) terminal on speaker.
Connect negative (-) terminal on amplifier to negative (-) terminal on speaker.
Repeat for second speaker in stereo setup.
Secure connections and ensure no bare wire is exposed.

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

Operation Guidelines

For optimal performance and longevity in outdoor environments.

Power sequence: Turn on amplifier last, turn off first to prevent pops.
Volume control: Start at low volume and increase gradually.
Weather monitoring: In extreme weather, consider covering or protecting speakers.
Seasonal adjustments: Check connections seasonally for corrosion or loosening.
Sound optimization: Adjust speaker angle for your listening area.
Amplifier matching: Ensure amplifier power matches speaker requirements.
Wire maintenance: Regularly inspect wires for damage or wear.
Performance testing: Periodically test speakers at different volume levels.

WARNING! Do not expose speakers to direct high-pressure water jets. While weather-resistant, they are not waterproof for submersion.

Weather Resistance Features

Designed specifically for outdoor environmental conditions.

Water Resistance: Protected against rain, snow, and splashing
UV Protection: Materials resistant to sun damage and fading
Temperature Tolerance: Operates in extreme hot and cold conditions
Corrosion Resistance: Stainless steel hardware and treated materials
Salt Air Compatibility: Suitable for coastal environments
Drainage Design: Allows water to drain from enclosure

Care & Maintenance

Regular maintenance ensures long-term performance.

Cleaning: Use soft cloth with mild soap and water. Do not use abrasive cleaners.
Grille cleaning: Remove dust and debris from perforated steel grille.
Connection check: Inspect terminals seasonally for corrosion.
Mounting inspection: Ensure brackets and screws remain tight.
Wire inspection: Check for damage, wear, or animal chewing.
Winter care: Remove heavy snow accumulation from speakers.

CAUTION! Do not use high-pressure washers or harsh chemicals. Never open speaker enclosure as this voids warranty.

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 registered trademarks of Bose Corporation. Articulated Array is a registered trademark of Bose Corporation. For support, visit www.bose.com or contact Bose Customer Service at 1-800-999-2673.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Amplifier off/wrong input	Check amplifier power and input selection; verify volume level.
Distorted sound	Overdriven amplifier	Reduce volume level; check amplifier power rating.
One speaker not working	Wire connection issue	Check connections at both amplifier and speaker; test wire continuity.
Intermittent sound	Loose or corroded connections	Clean and tighten all connections; replace corroded wires.
Reduced bass response	Speaker placement	Reposition speakers; ensure mounting surface is solid.
Water in enclosure	Damage or improper installation	Check for cracks or damage; ensure drainage holes are clear.
Corrosion on terminals	Exposure to elements	Clean with electrical contact cleaner; apply dielectric grease.

Service: For warranty service or technical support, contact Bose Customer Service at 1-800-999-2673 or visit www.bose.com.

Warranty: Limited warranty covers defects in materials and workmanship. See separate warranty document for details.