Introduction
Thank you for choosing the KZ Castor In Ear HiFi Earphones. This manual provides detailed instructions for the proper setup, operation, maintenance, and troubleshooting of your new earphones. Please read this manual carefully before use to ensure optimal performance and longevity of your device.

Figure 1: KZ Castor In Ear HiFi Earphones
Package Contents
Please check the package for the following items:
- KZ Castor Earphones (Earbuds)
- Silver-plated cable (with 3.5mm connector and C Pin type)
- Silicone ear tips (various sizes)
- Tuning lever
- User Manual (this document)
- Eco-friendly packaging

Figure 2: Package Contents
Setup Instructions
Choosing and Attaching Ear Tips
Select the ear tips that provide the best seal and comfort for your ears. The KZ Castor includes thermoplastic slow rebound memory foam eartips designed for enhanced wearing comfort, noise reduction, and sound isolation. Gently push the chosen ear tips onto the nozzle of the earphones until they are securely attached.

Figure 3: Thermoplastic Memory Foam Eartips
Connecting the Cable
The KZ Castor earphones use a C Pin type connector. Align the C Pin connectors on the cable with the corresponding ports on each earbud. Gently push them together until they click into place. Ensure the cable is correctly oriented for the left (L) and right (R) earbuds.

Figure 4: Earphones with Cable Attached
Understanding the Two Versions
The KZ Castor is available in two versions, each with a distinct sound profile:
- Harman Target Version: Tuned to closely follow the acclaimed Harman FR curve, offering a balanced and accurate sound perception.
- Harman Target with Improved Bass Version: Enhances low-frequency sensitivity and dynamic performance for a deeper bass experience, while maintaining Harman FR curve alignment for mid and high frequencies.

Figure 5: KZ Castor Version Comparison
Acoustic Tuning with DIP Switches
The KZ Castor features built-in professional-grade acoustic filters with DIP switches, allowing you to fine-tune the sound. There are 4 switches on each earbud, offering 16 different audio profiles. Use the included tuning lever to adjust the switches.

Figure 6: Tuning Switches
Refer to the diagram below for specific switch functions:

Figure 7: Tuning Switch Settings
- Switch 1 On: Low frequency increased by 1dB
- Switch 1 & 2 On: Low frequency increased by 2dB
- Switch 3 On: Mid-high frequency increased by 1dB
- Switch 3 & 4 On: Mid-high frequency increased by 2dB
- All Switches On: Overall frequency response is elevated.
Experiment with different combinations to find your preferred sound profile for various music styles.
Operating Instructions
Wearing the Earphones
Insert the earphones into your ears, ensuring a snug and comfortable fit. The cable is designed to loop over your ear for secure placement and reduced microphonics.
Connecting to an Audio Source
Plug the 3.5mm L-bending connector of the cable into the headphone jack of your audio device (e.g., smartphone, digital audio player, computer, PS5 controller).
Using the Control Button and Microphone
The KZ Castor earphones are equipped with a control button and a microphone (if you selected the MIC version). The control button typically allows for:
- Single press: Play/Pause music, Answer/End calls.
- Double press: Next track (functionality may vary by device).
- Triple press: Previous track (functionality may vary by device).
The integrated microphone allows for hands-free communication during calls.
Maintenance and Care
- Cleaning Ear Tips: Regularly remove and clean the ear tips with a soft, damp cloth. Ensure they are completely dry before reattaching.
- Cleaning Earphones: Wipe the earphone bodies with a dry, soft cloth. Avoid using harsh chemicals or abrasive materials.
- Cable Care: Handle the cable gently. Avoid sharp bends, pulling, or tangling to prevent damage.
- Storage: When not in use, store your earphones in a clean, dry place, preferably in a protective case, to prevent dust accumulation and physical damage.
- Avoid Moisture: These earphones are not waterproof. Keep them away from water, excessive humidity, and liquids.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound or distorted audio |
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| Poor fit or discomfort |
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| Microphone not working |
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Specifications

Figure 8: Product Information
| Feature | Detail |
|---|---|
| Brand Name | KZ |
| Model | Castor |
| Material | Metal |
| Category | Earphones & Headphones |
| Number Of Drivers | 2 (Dual Dynamic) |
| Vocalism Principle | Dynamic |
| Communication | Wired |
| Connectors | 3.5 MM |
| Plug Type | L Bending |
| Pin Type | C Pin cable (0.75mm) |
| Line Length | 1.25m ± 5cm |
| Frequency Response Range | 20 - 40000Hz |
| Sensitivity | Harman Target Version: 105±3dB, Improved Bass Version: 103±3dB |
| Resistance | Harman Target Version: 31-35Ω, Improved Bass Version: 16-20Ω |
| With Microphone | Yes (optional version) |
| Control Button | Yes |
| Volume Control | No |
| Active Noise-Cancellation | No |
| Waterproof | No |
| Certification | CE |
| Origin | Mainland China |
| Functions | For Mobile Phone, For Internet Bar, for Video Game, Monitor Headphone, HiFi Headphone, Sport |
User Tips
- Tuning Experimentation: Don't hesitate to experiment with the DIP switches. The 16 different sound profiles allow for significant customization to match your personal preference and various music genres.
- Bass Enhancement: If you desire a more pronounced bass, consider the "Harman Target with Improved Bass Version" of the Castor earphones. This version is specifically designed to deliver a deeper low-frequency experience.
- Gaming Compatibility: The KZ Castor earphones are compatible with gaming consoles like the PS5 controller via the standard 3.5mm jack, offering clear audio for gaming sessions.
- Wired Connection: Please note that the KZ Castor earphones are wired and do not support Bluetooth connectivity directly. They cannot be paired with Bluetooth helmets or other wireless devices without an external adapter.
- Cable Type: The earphones use a C Pin cable. Ensure any replacement cables are compatible with this pin type.
Warranty and Support
For warranty information, technical support, or any inquiries regarding your KZ Castor earphones, please contact the KZ Official Store or your point of purchase. Keep your proof of purchase for warranty claims.





