Jamo Sub 200 Service Manual

The Jamo Sub 200 is a high-performance powered subwoofer designed for home theater and audio systems, featuring a 200W RMS amplifier, 8-inch long-throw driver, variable crossover frequency, phase control, auto on/off functionality, line-level and speaker-level inputs, and LFE input for surround sound systems. Below are key sections for technical specifications, installation, operation, troubleshooting, and service procedures.

1. Technical Specifications 2. Installation Guide 3. Controls and Connections 4. Operation Settings 5. Amplifier Specifications 6. Driver Replacement 7. Crossover Settings 8. Phase Adjustment 9. Maintenance 10. Safety Information 11. Troubleshooting Guide

Technical Specifications

Key components: 8-inch woofer, 200W Class D amplifier, variable crossover, phase control, auto on/off circuit.

Specification	Description
Driver Size	8-inch long-throw woofer
Amplifier Power	200W RMS
Frequency Response	30Hz - 150Hz
Crossover Range	50Hz - 150Hz continuously variable
Phase Control	0-180 degrees
Inputs	Line-level RCA, LFE, Speaker-level
Outputs	Line-level pass-through
Auto On/Off	Signal sensing circuit
Power Supply	110-120V/220-240V, 50/60Hz
Enclosure	Bass reflex with front-firing port

Installation Guide

Proper placement and connection for optimal performance.

Choose location: Corner placement for maximum bass output; avoid corners for flatter response.
Connect to receiver: Use LFE input for home theater; line-level for stereo systems.
Speaker-level connection: Connect to main speaker outputs if line-level unavailable.
Power connection: Plug into AC outlet; ensure proper voltage setting.

WARNING! Subwoofer is heavy; use proper lifting technique. Ensure adequate ventilation around amplifier.

Controls and Connections

Rear panel controls and input/output configuration.

Controls: Power switch, Volume control, Crossover frequency, Phase switch, Auto on/off.

Inputs: LFE input (for surround receivers), Line-level inputs (L/R), Speaker-level inputs. Outputs: Line-level pass-through. Power: AC input with voltage selector. Status: Power LED indicator (green=on, red=standby).

Operation Settings

Optimal configuration for different room environments.

Volume setting: Start at 50%; adjust to blend with main speakers.
Crossover setting: Set to match main speakers' low-frequency capability.
Phase adjustment: Rotate for maximum bass output at listening position.
Auto on/off: Enable for energy saving; disable for constant operation.

CAUTION! Avoid extreme volume settings to prevent driver damage.

Amplifier Specifications

Amplifier Type: Class D switching amplifier
Power Output: 200W RMS, 400W peak
THD: <0.1% at rated power
Signal-to-Noise: >95dB
Input Sensitivity: 200mV for full output
Protection: Thermal, short-circuit, DC offset
Power Consumption: 0.5W standby, 250W max
Fuse Rating: T2A/250V (main), T500mA/250V (secondary)

Driver Replacement

Step-by-step procedure for woofer replacement.

Disconnect power and all cables from subwoofer.
Remove front grille by gently pulling from corners.
Remove mounting screws around woofer perimeter.
Disconnect speaker wires from driver terminals.
Install new driver and reconnect wires.
Replace screws and grille in reverse order.

WARNING! Disconnect power before servicing. Handle driver carefully to avoid damage.

Crossover Settings

Proper crossover configuration for system integration.

For home theater: Set crossover to 80Hz when using LFE input.
For stereo systems: Match crossover to main speakers' -3dB point.
Test different settings: Sweep frequency to find optimal blend point.
Use receiver crossover: Bypass subwoofer crossover when available.

Tip: Higher crossover settings for smaller main speakers.

Phase Adjustment

Phase control for proper bass integration.

Play test tone at crossover frequency.
Adjust phase control while listening at main listening position.
Choose setting that provides maximum bass output.
Verify with music content for natural sound.

Note: Phase adjustment critical for multiple subwoofer setups.

Maintenance

Routine maintenance procedures and cleaning.

Clean exterior with dry cloth only. Check connections periodically. Ensure ventilation ports remain unobstructed. Inspect driver surround for damage.

CAUTION! Do not use liquids or solvents for cleaning. Keep magnets away from electronic devices.

Safety Information

Important safety precautions for operation and service.

Disconnect power before servicing. Use proper fuses only. Ensure adequate ventilation. Do not operate with damaged power cord. Keep away from moisture and heat sources. Service by qualified personnel only.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No power	Power cord, fuse, switch	Check power connection; replace fuse; verify switch position.
No sound	Input connections, volume	Check input cables; adjust volume control; verify source.
Distorted sound	Overload, damaged driver	Reduce volume; inspect driver for damage; check enclosure.
Hum/buzz	Ground loop, cable issues	Use ground lift adapter; check cable shielding; separate from power cables.
Auto on not working	Signal level, circuit fault	Increase source volume; check auto circuit; manual operation.

Reset: Disconnect power for 30 seconds to reset protection circuits.

Service: Contact authorized Jamo service center for amplifier repairs.