KEF Q650c Center Channel Speaker User Manual

1. Introduction

This manual provides essential information for the proper setup, operation, and maintenance of your KEF Q650c Center Channel Speaker. The KEF Q650c is engineered to accurately reproduce dialogue and central sound elements within a home theater system, ensuring a clear and immersive audio experience.

Key features include a revamped Uni-Q Driver Array with a damped tweeter loading tube for smooth treble frequencies, a central 6.5-inch Uni-Q Driver Array, and two flanking 6.5-inch bass drivers. The speaker also benefits from a closed-box midrange cabinet, which enhances clarity and delivers a cleaner, more defined bass response.

Image 1: KEF Q650c Center Channel Speaker, angled front view, black finish.

2. Safety Information

• Placement: Ensure the speaker is placed on a stable, level surface to prevent it from falling.
• Ventilation: Do not block any ventilation openings. Allow adequate space around the speaker for proper airflow.
• Moisture: Do not expose the speaker to rain, moisture, or excessive humidity. Keep liquids away from the speaker.
• Heat: Keep the speaker away from heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
• Power: This is a passive speaker and requires connection to an appropriate amplifier or AV receiver. Ensure the amplifier is turned off before making any connections.
• Cleaning: Disconnect from power before cleaning. Use only a dry cloth.

3. Package Contents

The KEF Q650c Center Channel Speaker package includes:

• 1 KEF Q650c Center Channel Speaker

Note: Magnetic grilles for the Q650c are sold separately and are not included in the standard package.

4. Setup and Placement

Optimal placement of the KEF Q650c is crucial for achieving the best sound performance in your home theater system.

4.1 General Placement

The center channel speaker should ideally be placed directly below or above your television screen, centered horizontally. Aim to position the speaker as close to ear level as possible when seated in your primary listening position. This ensures that dialogue and central sound effects appear to originate directly from the screen.

Image 2: KEF Q650c Center Channel Speaker on a media console.

4.2 Cabinet Placement

Due to its closed-box midrange cabinet design, the Q650c can be placed inside a cabinet or on a shelf without significant adverse effects on its bass performance, unlike ported speakers that require space for their rear ports. Ensure there is still adequate ventilation around the speaker to prevent overheating of any associated electronics.

Image 3: KEF Q650c in a home theater setup.

4.3 Room Acoustics

Consider the acoustics of your room. Hard surfaces can reflect sound, while soft furnishings can absorb it. Experiment with speaker positioning and room treatments to achieve balanced sound. Avoid placing the speaker directly against a wall if possible, as this can sometimes lead to excessive bass.

Image 4: KEF Q650c in a comprehensive audio system.

5. Connections

The KEF Q650c is a passive speaker and requires connection to an external amplifier or AV receiver. Ensure your amplifier/receiver is turned off before making any connections.

5.1 Speaker Wire

Use high-quality speaker wire to connect the Q650c to the center channel output terminals on your amplifier or AV receiver. Observe correct polarity: connect the positive (+) terminal on the speaker to the positive (+) terminal on the amplifier, and the negative (-) terminal on the speaker to the negative (-) terminal on the amplifier.

5.2 Terminal Type

The Q650c typically features binding post terminals that accept bare wire, spade connectors, or banana plugs. Ensure connections are secure to prevent signal loss or short circuits.

6. Operation

Once properly connected to an amplifier or AV receiver, the KEF Q650c operates as part of your home theater system.

6.1 Powering On

Turn on your AV receiver or amplifier. The speaker will receive its audio signal and power from this connected device.

6.2 Volume Control

Adjust the volume using the controls on your AV receiver or amplifier. The Q650c is designed to handle up to 150 Watts of amplifier power.

6.3 Recommended Uses

The KEF Q650c is suitable for various audio applications, including:

• Surround Sound Systems
• Televisions
• DVD Players
• Music Players (as part of a multi-channel setup)

7. Maintenance

To ensure the longevity and optimal performance of your KEF Q650c speaker, follow these maintenance guidelines:

• Cleaning: Gently wipe the speaker cabinet with a soft, dry, lint-free cloth. Do not use abrasive cleaners, waxes, or solvents, as these can damage the finish.
• Dust: Regularly dust the speaker, especially the driver cones, using a soft brush or a microfiber cloth.
• Avoid Direct Sunlight: Prolonged exposure to direct sunlight can cause fading or damage to the cabinet finish.
• Environmental Conditions: Maintain a stable room temperature and humidity level. The speaker is not water-resistant.

8. Troubleshooting

If you encounter issues with your KEF Q650c speaker, refer to the following common troubleshooting steps:

8.1 No Sound

• Check Connections: Ensure all speaker wires are securely connected to both the speaker and the amplifier/receiver, observing correct polarity (+ to + and - to -).
• Amplifier/Receiver Settings: Verify that your amplifier or AV receiver is powered on, the correct input source is selected, and the volume is turned up. Check the speaker output settings in your receiver's menu to ensure the center channel is enabled.
• Source Material: Test with different audio sources to rule out an issue with the media itself.

8.2 Distorted Sound

• Volume Level: Reduce the volume on your amplifier/receiver. Distortion often occurs when the amplifier is overdriven.
• Speaker Wire: Inspect speaker wires for any fraying, damage, or loose connections that could cause interference.
• Amplifier Power: Ensure your amplifier's power output is within the recommended range for the Q650c (up to 150 Watts).
• Room Acoustics: Excessive bass or harsh treble can sometimes be mitigated by adjusting speaker placement or using room acoustic treatments.

9. Specifications

10. Warranty and Support

10.1 Warranty Information

The KEF Q650c Center Channel Speaker comes with a Limited Warranty. Please refer to the warranty documentation provided with your purchase for specific terms, conditions, and duration of coverage.

10.2 Customer Support

For technical assistance, service, or further inquiries, please visit the official KEF website or contact KEF customer support directly. You can often find detailed FAQs, product registration, and contact information on their support pages.

Manufacturer: KEF