Bose B2 Manual

The Bose B2 is a professional subwoofer designed for live sound and installed audio applications, featuring a high-power amplifier, advanced signal processing, and durable construction. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: High-power amplifier module, 12-inch driver, balanced XLR/TRS inputs and outputs, crossover controls, and protection circuitry.

Feature	Description
Amplifier Power	High-efficiency Class-D amplifier with advanced thermal management
Driver	12-inch long-excursion woofer with high-temperature voice coil
Input Connectors	Balanced XLR and 1/4" TRS combo jacks
Output Connectors	Balanced XLR pass-through for system expansion
Crossover Controls	Variable low-pass filter (50Hz-150Hz) and phase switch
Signal Processing	Built-in limiter and EQ presets for different applications
Protection	Thermal, overload, and short-circuit protection
Power Requirements	100-240V AC, 50/60Hz universal power supply
Enclosure	Durable plywood with textured finish and steel grille
Handles	Recessed handles for easy transport

Installation

Unpack and inspect contents. Choose appropriate location for optimal performance.

1. Positioning: Place on stable, level surface. For ground coupling, place directly on floor.
2. Ventilation: Ensure at least 6 inches clearance around ventilation ports.
3. Connect audio sources: Use balanced XLR or TRS cables from mixer output to subwoofer input.
4. Connect to tops: Use output connectors to feed full-range speakers.
5. Plug into AC power using included power cord.

WARNING! Subwoofer is heavy; use proper lifting techniques or two people. Ensure all connections are secure before powering on.

First-Time Setup

Power on subwoofer; follow these steps for initial configuration.

1. Set crossover frequency: Adjust LOW-PASS control based on your main speakers' frequency response.
2. Set phase: Use PHASE switch (0° or 180°) to align with main speakers.
3. Set input level: Start with GAIN control at minimum, then adjust while playing program material.
4. Select mode: Choose between MUSIC, LIVE, or CUSTOM preset using MODE switch.
5. Test system: Play audio through entire system to check integration.

CAUTION! Start with low volume levels and increase gradually to avoid damage to equipment or hearing.

Specifications

• Frequency Response: 38Hz - 150Hz (±3dB)
• Amplifier Power: 500W RMS, 1000W peak
• Maximum SPL: 126dB peak
• Crossover: Variable 50Hz-150Hz, 24dB/octave slope
• Input Impedance:20k ohms balanced
• Connectors: XLR/TRS combo inputs, XLR outputs
• Power Requirements: 100-240V AC, 50/60Hz, 3A max
• Dimensions: 18.5" H × 22" W × 19" D (470mm × 559mm × 483mm)
• Weight: 55 lbs (25 kg)
• Operating Temp: 32°F to 104°F (0°C to 40°C)

Controls and Settings

Rear panel controls: POWER switch, GAIN control, LOW-PASS filter, PHASE switch, MODE selector.

Front Indicators: POWER (green), SIGNAL (yellow), LIMIT (red), PROTECT (flashing red).

GAIN: Adjusts input sensitivity. Start at minimum and increase until desired level is reached. LOW-PASS: Sets crossover frequency. Typical setting is 80-100Hz for most applications. PHASE: Aligns subwoofer output with main speakers. MODE: MUSIC (flat response), LIVE (boosted punch), CUSTOM (user-defined via optional software).

Connecting Devices

Mixer to Subwoofer: Use balanced XLR or TRS cable from mixer main or aux output. Subwoofer to Tops: Use XLR from subwoofer output to full-range speaker input.

1. Turn off all equipment before making connections.
2. Use quality shielded cables to prevent noise and interference.
3. For stereo operation, use two subwoofers or sum stereo signal to mono.
4. For system expansion, daisy-chain multiple subwoofers using output connectors.

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

Operation Modes

Three preset modes optimized for different applications.

1. MUSIC mode: Flat frequency response for recorded music playback.
2. LIVE mode: Enhanced attack and punch for live vocal and instrument reinforcement.
3. CUSTOM mode: User-defined settings via optional control software (requires USB connection to computer).
4. Limiter: Built-in limiter protects driver from overload. LIMIT LED indicates when engaged.
5. Standby: Auto-standby activates after 30 minutes of no signal. Wake on audio detection.

WARNING! Do not operate in CUSTOM mode without proper software configuration to avoid damage.

Protection Features

Thermal Protection: Automatically reduces output if temperature exceeds safe limits. Overload Protection: Limits power to prevent driver damage. Short-Circuit Protection: Disables output if short is detected. Signal Detection: Auto-standby when no signal present.

Care & Maintenance

Unplug before cleaning. Wipe exterior with dry cloth. Clean grille with soft brush. Check connections periodically for corrosion or looseness.

CAUTION! Do not use liquids or solvents. Keep away from moisture and extreme temperatures. Store in dry environment when not in use.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. CE compliant for European market. RoHS compliant. Copyright © Bose Corporation. All rights reserved. For support, visit www.bose.com or contact 1-800-999-2673.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/outlet	Check power connection; try different outlet; ensure POWER switch is on.
No sound	Cables/connections	Check all audio connections; ensure source is active; adjust GAIN control.
Distorted sound	Overload/clipping	Reduce GAIN control; check source for distortion; ensure proper ventilation.
Protect LED flashing	Overload/short circuit	Turn off immediately; check speaker cables for shorts; allow to cool if thermal.
Hum or noise	Ground loop/cables	Use balanced connections; ensure proper grounding; try different cables.
Auto-standby issues	Signal level	Increase source level; disable auto-standby via MODE settings (if available).

Reset: Power cycle unit. For persistent issues, contact support.

Service: 1-800-999-2673; www.bose.com/prosupport