QTX Replacement Speaker Woofer - 12" - 4 Ohm - 400W
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Product Information
Full details
This guide is for users who need to replace the speaker driver in their QTX QR12A (178.204UK) speaker system. The key benefit is restoring full audio performance to your existing setup with a direct-fit replacement. A potential caveat is ensuring compatibility with non-QTX enclosures, as speaker mounting and acoustic properties can vary. This 12-inch (300mm) woofer offers 400W maximum power handling and 200W RMS, featuring vented magnets and spade terminals for secure connection, designed to meet the original specifications of its compatible model.
All features
| Model Part Number | 902.522UK |
|---|---|
| Brand | QTX |
Extended Product Information
FAQs
What amplifier power is recommended for this woofer?
The woofer has an RMS power handling of 200W and a maximum of 400W. It is best paired with an amplifier that can deliver between 150W to 250W RMS per channel for optimal performance and to prevent damage.
Can I use this woofer in any 12-inch speaker cabinet?
While it is a 12-inch driver, its acoustic specifications are tuned for the QTX QR12A. Using it in a different cabinet may alter the sound profile and bass response. Ensure the cabinet's internal volume and porting (if any) are suitable.
What does 'vented magnets' mean for performance?
Vented magnets help to dissipate heat generated by the voice coil during operation. This improves the driver's thermal capacity, allowing for higher power handling and sustained performance without overheating.
How do I know if my speaker requires a 4 Ohm driver?
Check the existing speaker driver's specifications or the speaker cabinet's manual. Most amplifiers are switchable or designed to handle different impedance loads, but it's crucial to match the speaker's impedance to the amplifier's capabilities.
What is the warranty period for this replacement driver?
Warranty information is typically provided by the retailer at the point of sale. Please refer to your purchase receipt or the retailer's website for specific warranty details.
Are the spade terminals a specific size?
Standard fast-on or spade terminals are typically used. If replacing wires, ensure you use connectors of the appropriate size (commonly 0.25 inch / 6.35mm) for a secure fit.
Troubleshooting
No sound from the speaker
Check that the speaker is correctly wired to the amplifier and that the amplifier is powered on and set to the correct input. Verify the replacement driver's terminals are securely connected.
Distorted or crackling sound
Ensure the amplifier is not overdriven (clipping). Check for loose connections on the driver terminals. Confirm the driver is not physically damaged or rubbing against the enclosure or grille.
Low volume or weak bass
Verify the amplifier's impedance matching (must be 4 Ohms compatible). Ensure the polarity of the speaker wires is correct. Check for any obstructions around the speaker cone.
Pros and Cons
Pros
- Ensures original sound quality when replacing a damaged driver.
- Built with quality components for reliable performance.
- Easy installation with spade terminals.
- Designed to fit specific QTX speaker models without modification.
Cons
- Only directly compatible with the QTX QR12A (178.204UK).
- May require professional installation if unfamiliar with speaker wiring.
- Susceptible to damage if used with an underpowered or over-spec'd amplifier.
- Performance may vary if installed in enclosures other than the intended QR12A.
Setup, Compatibility & Care
Setup:
- Safety First: Ensure the speaker system is unplugged and powered off before beginning.
- Access the Driver: Remove the speaker grille (if applicable) and unscrew the old driver from the enclosure.
- Disconnect Old Driver: Note the wiring to the old driver (positive and negative terminals) and disconnect the wires.
- Connect New Driver: Attach the wires to the new QTX woofer's spade terminals, ensuring correct polarity (+ to +, - to -).
- Mount New Driver: Securely screw the new woofer into the speaker enclosure.
- Reassemble: Replace the speaker grille and reconnect power.
Compatibility:
- Primary Compatibility: This driver is a direct replacement for the QTX QR12A (178.204UK).
- Other Enclosures: While the physical dimensions (12" / 300mm) and impedance (4 Ohms) are standard, acoustic performance can vary significantly when used in enclosures not designed for this specific driver. Compatibility with other speaker cabinets should be verified by experienced users.
Care:
- Cleaning: Dust the speaker cone gently with a soft, dry brush. Avoid using liquids or abrasive cleaners.
- Environment: Keep the speaker away from excessive moisture, dust, and extreme temperatures.
- Amplification: Always ensure your amplifier's output power and impedance rating are suitable for the speaker to prevent damage.