Jamo A3SUB 3 Manual

The Jamo A3SUB 3 is a high-performance powered subwoofer designed for home theater and audio systems, featuring a 3-inch driver, built-in amplifier, adjustable crossover frequency, phase control, auto on/off functionality, line-level and speaker-level inputs, and variable volume control. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 3-inch driver, built-in amplifier, adjustable controls, multiple input options.

Feature	Description
Driver Size	3-inch high-excursion woofer
Amplifier Power	Built-in Class D amplifier
Crossover Frequency	Adjustable 50-150Hz
Phase Control	0/180 degree switch
Auto On/Off	Automatic power management
Inputs	Line-level RCA, Speaker-level
Volume Control	Variable level adjustment
Power Supply	AC power input
Finish	Black wood grain cabinet
Dimensions	Compact design for easy placement

Installation

Unpack and inspect contents. Choose optimal placement for best bass response.

1. Position subwoofer: Place in corner for maximum bass, or near main speakers for integration.
2. Connect to audio system: Use line-level RCA cables from receiver subwoofer output.
3. Speaker-level connection: Connect to main speaker outputs if line-level unavailable.
4. Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block vents. Keep away from moisture.

First-Time Setup

Power on subwoofer; adjust basic settings for optimal performance.

1. Set volume: Start at 50% and adjust during audio playback.
2. Adjust crossover: Set between 80-120Hz based on main speakers' capabilities.
3. Set phase: Start at 0 degrees; switch to 180 if bass seems weak.
4. Test auto on/off: Subwoofer should power on automatically when signal detected.

CAUTION! Avoid placing near heat sources or in direct sunlight.

Specifications

• Driver: 3-inch long-throw woofer
• Amplifier Power: Class D amplifier (specific wattage)
• Frequency Response: 40-150Hz
• Crossover: Adjustable 50-150Hz
• Inputs: Stereo RCA line-level, Speaker-level terminals
• Phase Switch: 0/180 degrees
• Auto On/Off: Signal-sensing power management
• Power Requirements: 120V AC, 60Hz
• Dimensions: Compact cabinet design
• Weight: Lightweight for easy placement

Controls and Settings

Rear panel controls: Volume, Crossover Frequency, Phase Switch, Power Switch.

Volume Control: Adjusts subwoofer output level. Crossover: Sets frequency cutoff point. Phase: Aligns subwoofer timing with main speakers. Power: Manual on/off/auto selection.

Optimal Settings: Volume - match with main speakers; Crossover - 80Hz for most systems; Phase - choose setting with strongest bass.

Connecting Devices

Line-level: RCA cable from receiver subwoofer output. Speaker-level: From amplifier speaker outputs.

1. Turn off all equipment before connecting.
2. Use quality shielded cables for line-level connections.
3. Ensure secure connections at both ends.
4. For speaker-level, observe correct polarity (+/-).

Tip: Use subwoofer cable for best performance in line-level connections.

Operation

Normal operation with auto on/off functionality.

1. Power on: Set to AUTO position for automatic operation.
2. Audio playback: Subwoofer activates when audio signal detected.
3. Volume adjustment: Fine-tune to blend with main speakers.
4. Crossover adjustment: Set based on main speaker capabilities.
5. Phase adjustment: Optimize for room acoustics.

WARNING! Do not operate at maximum volume for extended periods.

Advanced Features

Auto On/Off: Conserves power when no signal detected. Phase Control: Time alignment with main speakers. Variable Crossover: Precise frequency integration.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for cabinet. Avoid chemical cleaners.

CAUTION! Do not open cabinet; no user-serviceable parts inside.

Regulatory Information

FCC compliant; CE certified. Manufactured to meet international safety standards. Copyright © Jamo; all rights reserved. For support, visit www.jamo.com or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Power/connections	Check power connection; verify input source; ensure volume up.
Weak bass	Phase/placement	Try phase switch 180; reposition subwoofer; check crossover setting.
Auto on not working	Signal level	Increase source volume; check connections; manual mode test.
Distortion	Overload	Reduce volume; check source material; verify connections.
Hum/buzz	Ground loop	Check cable quality; try different outlet; use ground lift if available.

Reset: Power cycle if experiencing issues.

Service: Contact authorized Jamo service center for repairs.