Bose GS Series III Manual

The Bose GS Series III is a professional-grade loudspeaker system designed for high-fidelity audio reproduction in various applications. It features advanced driver technology, robust construction, and versatile connectivity options. 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 Audio Sources 7. Operation Guidelines 8. Maintenance & Care 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: High-excursion woofers, precision tweeters, built-in protection circuitry, multiple input options, and durable enclosure.

Feature	Description
Woofer	High-power handling, long-throw design for deep bass
Tweeter	High-frequency driver with wide dispersion
Input Connectors	XLR and 1/4" TRS balanced inputs
Protection Circuitry	Thermal and overload protection
Enclosure	Rugged plywood construction with textured finish
Grille	Steel mesh with foam backing
Handles	Recessed handles for easy transport
Pole Mount	Integrated socket for standard speaker poles
Power Rating	High continuous power handling
Frequency Response	Wide range for full-spectrum audio

Installation

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

Positioning: Place speakers on stable surfaces or mount securely.
Pole Mounting: Insert pole into socket on bottom of speaker; tighten securely.
Wall Mounting: Use appropriate brackets (not included); ensure secure attachment to wall studs.
Connect power: Plug into appropriate AC outlet.

WARNING! Speakers are heavy; use proper lifting techniques or assistance. Ensure mounting hardware is rated for speaker weight.

First-Time Setup

Connect audio sources and power on system.

Connect audio cables: Use balanced XLR or 1/4" TRS cables from mixer/amplifier to speaker inputs.
Power connection: Connect to appropriate power source (check voltage requirements).
Initial testing: Start with volume low, play test signal, gradually increase to desired level.
Position adjustment: Fine-tune speaker angle and placement for optimal coverage.

CAUTION! Ensure proper ventilation around speakers. Do not block ports or vents.

Specifications

System Type: 2-way bass-reflex loudspeaker
Frequency Response: 45Hz - 18kHz (±3dB)
Power Handling: 300W continuous, 1200W peak
Sensitivity: 98dB SPL (1W/1m)
Maximum SPL: 128dB peak
Coverage Pattern: 90° H x 60° V
Connectors: Dual NL4 Speakon, XLR/TRS combo jack
Enclosure Material: 15mm birch plywood
Dimensions: 24" H x 15" W x 12" D (610 x 381 x 305 mm)
Weight: 42 lbs (19 kg)

Controls and Connections

Rear panel features: Input connectors, sensitivity control, limit indicator.

Input Section: XLR/TRS combo jack, NL4 Speakon connectors, sensitivity control (-6dB to +6dB), clip/limit LED indicator.

Operation: Adjust sensitivity to match source level. Green LED indicates normal operation; red LED indicates limiting/overload. Use balanced connections for best noise rejection.

Connecting Audio Sources

Multiple connection options: Mixer outputs, amplifier outputs, daisy-chaining to additional speakers.

Turn off all equipment before making connections.
Connect mixer/amplifier outputs to speaker inputs using balanced cables.
For daisy-chaining: Connect from speaker output to next speaker input using appropriate cables.
Ensure proper polarity: Pin 1 to ground, Pin 2 to positive (+), Pin 3 to negative (-) for balanced connections.

Tip: Use high-quality cables of appropriate length. Avoid running audio cables parallel to power cables.

Operation Guidelines

Optimal performance requires proper gain structure and monitoring.

Power sequence: Turn on source equipment first, then power amplifiers/speakers last.
Gain setting: Adjust sensitivity control so mixer/amplifier operates below clipping.
Monitoring: Watch limit LED; occasional flickering is normal, constant illumination indicates excessive input.
Volume adjustment: Adjust at source, not at speaker sensitivity control.
Thermal monitoring: Allow adequate cooling time between extended high-volume sessions.

WARNING! Do not operate at levels causing continuous limit indication. This can damage speakers and hearing.

Maintenance & Care

Regular maintenance ensures long-term performance.

Cleaning: Use dry, soft cloth for exterior. For grille, use soft brush to remove dust. Storage: Store in dry, temperature-controlled environment. Transport: Use protective covers; secure in vehicle to prevent shifting.

CAUTION! Do not use liquid cleaners or solvents. Do not expose to extreme temperatures or moisture.

Regulatory Information

FCC Compliance: Class B digital device; complies with Part 15 of FCC rules. CE Marking: Complies with European directives. Safety Standards: Meets UL, CSA, and other applicable safety standards. Copyright © Bose Corporation. All rights reserved. For support, visit www.bose.com or contact Bose Professional support.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Power/connections	Check power connection; verify audio cables are connected properly; check source output.
Distorted sound	Overload/clipping	Reduce source level; check sensitivity setting; verify amplifier not clipping.
Intermittent sound	Loose connections	Check all cable connections; inspect cables for damage.
Limit LED constantly on	Excessive input	Reduce source level; adjust sensitivity control downward.
Hum or buzz	Ground loop/cable issues	Use balanced connections; ensure proper grounding; try different cables.

Reset: Power cycle system if abnormal behavior occurs.

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