Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of your Celestion Copperback 12-inch, 250-watt, 8-ohm replacement guitar speaker. Please read these instructions thoroughly before proceeding with installation or use.
Safety Information
- Always disconnect power from your amplifier or cabinet before installing or replacing speakers.
- Ensure the replacement speaker's impedance (8 Ohms) matches your amplifier's output impedance requirements. Mismatched impedance can damage your amplifier.
- Handle the speaker with care. Avoid touching the cone or dust cap to prevent damage.
- This speaker is designed for indoor use only and is not water-resistant. Avoid exposure to moisture or extreme temperatures.
- Ensure proper ventilation around the speaker and amplifier during operation.
What's in the Box
Your Celestion Copperback speaker package should contain the following:
- One (1) Celestion Copperback 12-inch Woofer
If any components are missing or damaged, please contact your retailer or Celestion support.
Setup and Installation
The Celestion Copperback speaker is designed for flush mounting in compatible guitar amplifier cabinets.
- Preparation: Disconnect power from your amplifier and speaker cabinet. Carefully remove the existing speaker, noting its wiring connections.
- Mounting: Align the Celestion Copperback speaker with the mounting holes in your cabinet. Secure the speaker using appropriate screws and washers (not included) to ensure a snug, vibration-free fit. Do not overtighten.
- Wiring: Connect the positive (+) terminal of the speaker to the positive output of your amplifier or cabinet wiring. Connect the negative (-) terminal of the speaker to the negative output. Ensure all connections are secure and properly insulated. This speaker operates in a mono audio output mode.
- Impedance Check: Confirm that the 8-ohm impedance of the Copperback speaker is compatible with your amplifier's output.

Figure 1: Front view of the Celestion Copperback 12-inch replacement guitar speaker, showcasing its black cone and sturdy frame with mounting holes.
Operating Instructions
Once installed, the Celestion Copperback speaker functions as a passive component of your guitar amplifier system. Its operation is controlled by your amplifier.
- Power On: After ensuring all connections are correct and secure, power on your guitar amplifier.
- Volume Control: Gradually increase the volume on your amplifier to the desired listening level.
- Tone Characteristics: The Copperback is designed to offer a "transparent" sound, allowing the true character of your amplifier to shine through without adding excessive coloration. It is suitable for various musical styles and amplifier types.
- Recommended Use: This speaker is specifically recommended for guitar amplifiers in settings such as music studios and live performances.
Maintenance
Proper care will ensure the longevity and performance of your Celestion Copperback speaker.
- Cleaning: Use a soft, dry cloth to gently wipe the exterior of the speaker. Do not use liquid cleaners or solvents, as these can damage the cone or surround. Avoid touching the speaker cone directly.
- Storage: If storing the speaker separately, keep it in a dry, temperature-controlled environment, away from direct sunlight and moisture.
- Environmental Conditions: This speaker is designed for indoor use. Protect it from rain, spills, and excessive humidity.
Troubleshooting
If you encounter issues with your Celestion Copperback speaker, refer to the following common troubleshooting steps:
- No Sound:
- Check all wiring connections between the speaker and amplifier. Ensure they are secure and correctly polarized (+ to +, - to -).
- Verify that the amplifier is powered on and functioning correctly.
- Confirm the speaker cable is not damaged.
- Distorted Sound:
- Ensure the amplifier's volume is not set excessively high, causing clipping or speaker overload.
- Check for any loose mounting screws that might cause cabinet vibrations.
- Verify that the speaker's impedance matches the amplifier's output impedance.
- Inspect the speaker cone for any visible damage.
- Intermittent Sound:
- Check for loose or corroded connections at both the speaker terminals and amplifier output.
- Test with a different speaker cable if possible.
If problems persist after performing these checks, consult a qualified technician or contact Celestion customer support.
Specifications
| Feature | Detail |
|---|---|
| Model Name | Copperback |
| Brand | CELESTION |
| Speaker Type | Woofer (Guitar Speaker) |
| Speaker Diameter | 12 Inches |
| Impedance | 8 Ohms |
| Maximum Output Power | 250 Watts |
| Recommended Uses | Guitar Amplifier, Music Studio, Live Performance |
| Mounting Type | Flush Mount |
| Audio Output Mode | Mono |
| Material | Copper (referring to internal components/aesthetic) |
| Item Weight | 4.9 Kilograms (10.78 pounds) |
| Environmental Use | Indoor Only, Not Water Resistant |
| UPC | 739894637800 |
| Item Model Number | 0739894637800 |
Warranty Information
The Celestion Copperback speaker comes with a Limited Warranty. For specific terms, conditions, and duration of the warranty, please refer to the documentation provided with your purchase or visit the official Celestion website. Keep your proof of purchase for warranty claims.
Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Celestion customer support through their official website or your authorized dealer.
Website: www.celestion.com