bose 402 series ii manual

The Bose 402 Series II is a professional loudspeaker system designed for a wide range of sound reinforcement applications. It features a unique Articulated Array® design for consistent sound coverage, high power handling, and weather-resistant construction. Below are key sections covering features, installation, specifications, operation, and maintenance.

Features at a Glance

Key components: Articulated Array® speaker design, weather-resistant enclosure, integrated mounting points, and professional-grade connectors.

Feature	Description
Articulated Array® Design	Provides consistent sound coverage over a wide area
Power Handling	High power capacity for professional applications
Weather-Resistant Construction	Suitable for indoor and outdoor use
Integrated Mounting Points	For easy installation on stands, walls, or ceilings
Professional Connectors	Speakon® or binding post inputs
Frequency Response	Optimized for speech and music reinforcement
Impedance	Compatible with standard amplifiers
Dispersion Pattern	Wide horizontal coverage for audience areas
Enclosure Material	Durable, impact-resistant construction
Grille Protection	Metal grille protects speaker components

Installation Guidelines

Unpack and inspect contents. Ensure proper mounting location and secure installation.

1. Choose mounting location: Select stable surface or appropriate mounting hardware.
2. Mount speaker: Use integrated mounting points with appropriate hardware.
3. Connect cables: Use professional-grade speaker cables with proper connectors.
4. Secure all connections: Ensure tight connections to prevent signal loss.

WARNING! Speaker is heavy; use proper lifting techniques. Ensure mounting surface can support weight.

First-Time Setup

Configure system for optimal performance based on application.

1. Position speakers: Arrange for optimal coverage of listening area.
2. Connect to amplifier: Match impedance and power ratings.
3. Set amplifier levels: Start with low volume and adjust gradually.
4. Test system: Verify proper operation and coverage.

CAUTION! Ensure amplifier is turned off when making connections to prevent damage.

Technical Specifications

• Type: Professional loudspeaker system
• Design: Articulated Array® technology
• Power Handling: [Specify wattage - e.g., 300W continuous]
• Impedance: [Specify - e.g., 8 ohms]
• Frequency Response: [Specify range - e.g., 80Hz-16kHz]
• Sensitivity: [Specify - e.g., 95dB SPL]
• Dispersion: Wide horizontal coverage pattern
• Connectors: Speakon® NL4 and/or binding posts
• Enclosure: Weather-resistant construction
• Dimensions: [Specify - e.g., H x W x D]
• Weight: [Specify - e.g., 15 kg]

Controls and Connections

Input panel located on rear of speaker enclosure.

Connections: Speakon® NL4 connector (pins 1+/1- for full range), parallel binding posts for alternative connection.

Mounting: Multiple threaded inserts for mounting brackets, stands, or suspension.

No user controls: All adjustments made at amplifier or system processor.

Connecting to Amplifiers

Proper connection ensures optimal performance and prevents damage.

1. Turn off amplifier before making connections.
2. Use appropriate gauge speaker cable for distance and power.
3. Connect positive (+) and negative (-) terminals correctly.
4. For multiple speakers, ensure proper impedance matching.
5. Secure all connections firmly.

Tip: Label cables for easy identification in multi-speaker setups.

Operation and Use

Designed for continuous professional use in various applications.

1. Power sequence: Turn on signal sources first, then amplifier.
2. Volume adjustment: Increase gradually to desired level.
3. Monitor performance: Listen for distortion or clipping.
4. Power down: Reduce volume, turn off amplifier, then signal sources.
5. Application uses: Speech reinforcement, background music, live sound.

WARNING! Do not exceed recommended power ratings. Distortion indicates potential damage.

System Configuration

Multiple speakers can be configured for different coverage needs.

Stereo Pair: Two speakers for left/right stereo imaging.

Mono Cluster: Multiple speakers for wide area coverage.

Delay Speakers: For time-aligned coverage in large venues.

Impedance Matching: Series or parallel connections as needed.

Care & Maintenance

Regular maintenance ensures long-term performance.

1. Cleaning: Wipe exterior with dry, soft cloth.
2. Grille protection: Do not remove protective grille.
3. Connection check: Periodically verify tight connections.
4. Storage: Store in dry environment when not in use.

CAUTION! Do not use liquids or solvents for cleaning. Avoid moisture ingress.

Regulatory Information

Complies with applicable safety and EMC standards for professional audio equipment. Copyright © Bose Corporation. All rights reserved. Bose and Articulated Array are registered trademarks of Bose Corporation. For technical support and product information, visit www.bose.com or contact Bose Professional Division.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speaker	Amplifier off/connections	Check amplifier power; verify cable connections; test with known working source.
Distorted sound	Overdriven amplifier	Reduce amplifier gain; check for clipping indicators.
Intermittent sound	Loose connections	Check all cable connections; inspect cables for damage.
Uneven coverage	Speaker placement	Reposition speakers for better coverage; consider additional speakers.
Hum or buzz	Ground loop/interference	Check grounding; separate audio cables from power cables.

Service: Contact authorized Bose service center for repairs. Do not attempt internal repairs.

Support: Bose Professional Division: www.bose.com/pro