Bose Acoustimass 3 Subwoofer Manual

The Bose Acoustimass 3 Subwoofer is a compact, high-performance bass module designed to deliver deep, impactful low-frequency sound. It is engineered to work seamlessly with compatible Bose satellite speakers to create a full-range audio experience. This manual covers safety, setup, operation, and troubleshooting for optimal performance.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Connections 6. Connecting to Audio Systems 7. Operation Guidelines 8. Placement Tips 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Acoustimass 3 subwoofer unit, power cord, audio input terminals, and status indicator.

FeatureDescription
Compact DesignSpace-saving enclosure for flexible placement
High-Excursion DriverDelivers deep, accurate bass response
Proprietary Bass TuningOptimized for seamless integration with Bose satellites
Auto-On CircuitryPowers on automatically when audio signal is detected
Status LEDIndicates power and operational status
Line-Level InputsFor connection to AV receivers or amplifiers
Speaker-Level InputsFor direct connection from amplifier speaker outputs
Phase SwitchAdjusts timing alignment with main speakers
Crossover NetworkBuilt-in for filtering high frequencies
Power RequirementsStandard AC power outlet

Installation

Unpack and inspect contents. Choose an appropriate location.

  1. Place subwoofer: Position on a stable, level surface away from heat sources and moisture.
  2. Connect to audio source: Use either line-level (RCA) or speaker-level inputs based on your system.
  3. Connect satellite speakers: Wire from subwoofer outputs to Bose satellite speakers if applicable.
  4. Plug into AC power: Use the provided power cord and a grounded outlet.

WARNING! Ensure proper ventilation; do not block vents. Use two people for handling if heavy.

First-Time Setup

Power on subwoofer; follow initial configuration steps.

  1. Set phase switch: Start at 0°; adjust if bass seems weak or out of sync.
  2. Adjust volume/gain: Use the control on the subwoofer or your receiver's bass management.
  3. Configure crossover: Set receiver crossover to match subwoofer's range (typically 80-120Hz).
  4. Test audio: Play content with bass to verify operation and integration.

CAUTION! Ensure all connections are secure before powering on.

Specifications

Controls and Connections

Rear Panel: Power switch, AC inlet, line-level inputs (L/R), speaker-level inputs/outputs, phase switch, volume/gain control.

Status Indicator: LED shows power (solid) or standby (off/blinking).

Phase Switch: Aligns bass timing with main speakers. Volume/Gain: Adjusts subwoofer output level. Input Selection: Use appropriate inputs for your setup. Auto-On: Activates when signal detected; goes to standby after period of inactivity.

Connecting to Audio Systems

Line-Level: Use RCA cables from receiver's SUBWOOFER or LFE output. Speaker-Level: Connect from amplifier's speaker outputs to subwoofer inputs, then from subwoofer outputs to main speakers.

  1. Turn off all equipment before making connections.
  2. Match polarity (+/-) when using speaker-level connections.
  3. Use high-quality cables for best performance.
  4. Secure all connections firmly.

Tip: For home theater, use the LFE/subwoofer output from your AV receiver.

Operation Guidelines

Designed for continuous operation with audio signals.

  1. Power: Switch to ON; auto-standby activates after no signal.
  2. Volume adjustment: Set subwoofer volume to blend with main speakers.
  3. Phase adjustment: Switch to 180° if bass seems weak at listening position.
  4. Crossover setting: Use receiver's settings or subwoofer's built-in crossover.
  5. Testing: Use bass-heavy music or test tones to fine-tune placement and settings.

WARNING! Do not operate at extremely high volumes for extended periods to prevent damage.

Placement Tips

Corner placement: Increases bass output. Near-field: Along front wall near main speakers. Experimentation: Try different locations for optimal bass response.

Note: Room acoustics significantly affect bass performance; slight repositioning can make substantial differences.

Care & Maintenance

Unplug before cleaning. Wipe exterior with dry, soft cloth. Avoid liquids and abrasive cleaners.

CAUTION! Do not open enclosure; no user-serviceable parts inside. Keep away from moisture and extreme temperatures.

Regulatory Information

FCC Compliance: Class B digital device; complies with Part 15 rules. Copyright © Bose Corporation. All rights reserved. Bose and Acoustimass are registered trademarks of Bose Corporation. For support, visit www.bose.com or contact Bose customer service.

Troubleshooting

SymptomPossible CauseCorrective Action
No sound from subwooferPower/connectionsCheck power switch and outlet; verify audio connections; ensure auto-on is functioning.
Weak or distorted bassSettings/placementAdjust volume/gain; check phase setting; reposition subwoofer; verify source material.
Subwoofer won't turn onPower supplyCheck power cord and outlet; ensure power switch is ON.
Hum or buzzGround loop/interferenceUse grounded outlet; check cable routing away from power sources; try different outlet.
Auto-on not workingSignal level/connectionsIncrease source volume; check input connections; disable auto-on if available.

Reset: Power cycle (unplug for 30 seconds, then reconnect).

Service: Contact Bose customer support or authorized service center.

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