Jamo Sub 260 Service Manual

The Jamo Sub 260 is a high-performance powered subwoofer designed for home theater and audio systems. This active subwoofer features a 10-inch long-throw driver, built-in 260W RMS amplifier, variable crossover frequency, phase control, auto on/off functionality, line-level and speaker-level inputs, and adjustable volume control. Below are key sections for technical specifications, installation, operation, troubleshooting, and service procedures.

Technical Specifications

Key components: 10-inch woofer, built-in amplifier, crossover network, enclosure.

Installation Guide

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

1. Position subwoofer: Place in corner for maximum output or near main speakers for integration.
2. Connect audio sources: Use line-level RCA cables from receiver subwoofer output or speaker-level connections.
3. Power connection: Plug into AC wall outlet matching voltage requirements.
4. Initial settings: Set crossover to 80Hz, phase to 0°, volume to mid-level.

WARNING! Subwoofer is heavy; lift with proper technique. Ensure adequate ventilation around amplifier.

Controls and Connections

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

Connections: Line-level Input (L/R RCA), Speaker-level Input, AC Power Input.

Volume: Adjusts subwoofer output level. Crossover: Sets upper frequency limit (50-150Hz). Phase: Aligns subwoofer with main speakers (0° or 180°). Power: Auto/On/Off modes.

Operation Instructions

Power on subwoofer; adjust settings for optimal performance.

1. Set power switch to AUTO or ON position.
2. Adjust volume control to match main speaker levels.
3. Set crossover frequency based on main speaker capabilities.
4. Adjust phase control for seamless integration with main speakers.
5. Fine-tune placement for room acoustics.

CAUTION! Avoid extreme volume settings that may cause distortion or damage.

Amplifier Specifications

• Power Output: 260W RMS
• THD: <0.1% at rated power
• Signal-to-Noise: >95dB
• Input Sensitivity: 200mV for full output
• Input Impedance: 10k ohms
• Protection: Thermal, short-circuit, overload
• Power Consumption: 350W max
• Standby Power: <1W

Driver Specifications

• Size: 10-inch
• Cone Material: Polypropylene with rubber surround
• Voice Coil: 2-inch high-temperature aluminum
• Magnet: 40 oz ferrite
• Power Handling: 260W RMS
• Impedance: 4 ohms
• Resonance Frequency: 25Hz

Crossover Settings

Variable crossover from 50Hz to 150Hz. Recommended settings:

1. Small satellite speakers: 100-150Hz
2. Bookshelf speakers: 80-100Hz
3. Floorstanding speakers: 50-80Hz
4. Home theater: Set to match receiver crossover setting

Tip: Use test tones and measurements for precise crossover alignment.

Phase Adjustment

Phase control (0° or 180°) aligns subwoofer output with main speakers.

1. Play bass-heavy content.
2. Switch between 0° and 180° positions.
3. Select position that provides strongest bass at listening position.
4. For precise adjustment, use measurement microphone and test tones.

Note: Correct phase setting improves bass integration and impact.

Troubleshooting Guide

Service Procedures

Authorized service procedures for qualified technicians only.

1. Amplifier module replacement
2. Driver replacement and alignment
3. Crossover network service
4. Power supply repair
5. Protection circuit testing

WARNING! High voltages present. Disconnect power before servicing.

Parts List

Service Contact: Authorized Jamo service centers only.