Bose 502 Subwoofer Manual

The Bose 502 Subwoofer is a professional-grade low-frequency loudspeaker designed for commercial sound reinforcement applications. It features a high-power handling capacity, weather-resistant construction (when used with optional grille), and is engineered to deliver deep, powerful bass response. 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 Settings 6. Connecting Devices 7. Operation Guidelines 8. System Configuration 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-excursion 12-inch driver, built-in passive crossover, heavy-duty enclosure with internal bracing, dual NL4 Speakon connectors, and optional weather-resistant grille.

FeatureDescription
Driver12-inch high-excursion woofer for deep bass reproduction
Power HandlingHigh power capacity for professional applications
EnclosureDurable, internally braced cabinet with textured finish
ConnectorsDual NL4 Speakon connectors for parallel wiring
Weather ResistanceOptional grille provides protection against moisture
CrossoverBuilt-in passive crossover network
Mounting OptionsDesigned for floor placement; optional pole mount available
Frequency ResponseOptimized for low-frequency reinforcement
ImpedanceNominal 8 ohms per cabinet
ApplicationCommercial sound systems, background music, live sound

Installation

Unpack and inspect contents. Ensure proper placement for optimal performance.

  1. Choose location: Place on stable, level surface near main speakers.
  2. Connect to amplifier: Use professional speaker cable with NL4 connectors.
  3. Secure connections: Ensure Speakon connectors are fully engaged and locked.
  4. Position subwoofer: For best bass response, place near walls or corners.

WARNING! Subwoofer is heavy; use proper lifting techniques or assistance. Ensure amplifier is turned off during connections.

First-Time Setup

Connect to your sound system and configure for optimal performance.

  1. Connect to amplifier: Use appropriate speaker cables from amplifier output to subwoofer input.
  2. Set crossover: If using external crossover, set frequency typically between 80-120 Hz.
  3. Adjust phase: Match subwoofer phase with main speakers for coherent bass.
  4. Set volume level: Balance subwoofer output with main speakers.

CAUTION! Do not exceed amplifier power ratings. Start with low volume and gradually increase.

Specifications

Controls and Settings

The 502 Subwoofer is a passive design with no external controls. All adjustments are made at the amplifier or system processor.

Amplifier Settings: Gain/volume, crossover frequency, phase adjustment, equalization.

System Configuration: Typically used with Bose 502A or 502B bass controllers for optimal performance. When used with controller, follow controller manual for proper settings.

Connecting Devices

Connect to amplifier using professional speaker cables with NL4 connectors.

  1. Turn off amplifier before making connections.
  2. Use appropriate gauge speaker wire for the distance and power level.
  3. Connect amplifier output to subwoofer input using NL4 connectors.
  4. For multiple subwoofers, use parallel wiring via dual connectors.
  5. Ensure all connections are secure before powering on.

Tip: Use the second NL4 connector for daisy-chaining additional subwoofers if needed.

Operation Guidelines

For optimal performance and longevity:

  1. Power sequence: Turn on amplifier last, turn off first.
  2. Volume adjustment: Increase gradually to desired level.
  3. Monitor performance: Listen for distortion or clipping.
  4. Environmental considerations: Avoid extreme temperatures and moisture.
  5. When used outdoors: Install optional weather-resistant grille.

WARNING! Do not operate at levels causing audible distortion. This can damage the driver and amplifier.

System Configuration

The 502 Subwoofer is designed to work with Bose 502A or 502B bass controllers for optimal performance in full-range systems.

With 502A/B Controller: Controller provides proper equalization and crossover points. Follow controller manual for setup.

Without Controller: Use external crossover set to appropriate frequency (typically 80-120 Hz). May require additional equalization for flat response.

Care & Maintenance

Unplug from amplifier before cleaning. Use soft, dry cloth only; avoid liquids or abrasive cleaners.

Regular Maintenance: Check connections periodically for tightness. Inspect cabinet for damage. Keep ventilation areas clear.

CAUTION! Do not use solvents or harsh chemicals. Avoid exposure to direct sunlight for extended periods.

Regulatory Information

Complies with applicable safety and EMC regulations. This product may be covered by one or more patents. Copyright © Bose Corporation. All rights reserved. Bose and 502 are trademarks of Bose Corporation. For support, visit www.bose.com or contact Bose Professional support.

Troubleshooting

SymptomPossible CauseCorrective Action
No sound from subwooferConnection issues, amplifier settingsCheck all cable connections; verify amplifier is on and properly configured; check amplifier output.
Distorted soundOverdriving, damaged driverReduce volume level; check for damaged voice coil; inspect for physical damage.
Weak bass outputPhase cancellation, settingsAdjust phase control on amplifier; verify crossover settings; check placement.
Hum or buzzGround loop, cable issuesCheck cable routing away from power cables; ensure proper grounding; try different cables.
Cabinet vibrationLoose components, placementTighten all hardware; ensure cabinet is on stable surface; check internal bracing.

Service: For technical support, contact Bose Professional or authorized service center. Do not attempt to repair internally unless qualified.

Warranty: Refer to original purchase documentation for warranty terms and conditions.

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