1. Introduction
The YJCO E300 is a compact desktop balanced headphone amplifier designed to deliver high-fidelity audio. Boasting an elegant design and a small footprint, it features versatile interfaces for easy connection to various audio devices. Built without compromise, it uses premium audio-grade capacitors throughout, delivering exceptionally smooth, musical sound with rich, vivid details.
2. Setup
2.1 Package Contents
- YJCO E300 Headphone Amplifier x1
- Note: No power adapter is included. A DC12V power adapter (5.5*2.5mm, center-positive polarity) must be purchased separately.
2.2 Component Identification
Familiarize yourself with the front and rear panels of the E300 amplifier:
2.3 Power Connection
- Ensure the E300's power switch is in the OFF position.
- Connect a DC12V power adapter (not included) to the DC Power Jack on the rear panel. The jack specification is 5.5*2.5mm, with positive inner and negative outer polarity.
- WARNING: Do not use a power supply exceeding 12V, as this will damage the unit.
2.4 Audio Input Connection
Connect your audio source (e.g., DAC, preamplifier) to the E300 using either RCA or XLR cables:
- RCA Input: Connect RCA cables from your source to the RCA Input jacks (L and R) on the rear panel.
- XLR Balanced Input: Connect XLR cables from your source to the XLR Balanced Input jacks (L and R) on the rear panel.
2.5 Audio Output Connection
Connect your headphones to one of the available output ports on the front panel:
- 4-pin XLR Output: For balanced headphones.
- 4.4mm Balanced Output: For balanced headphones.
- 3.5mm Output: For single-ended headphones.
- 6.35mm Output: For single-ended headphones.
The four output ports of the E300 are connected in parallel, and all outputs produce sound simultaneously.
3. Operating Instructions
3.1 Power On/Off
Toggle the Power Switch on the rear panel to turn the amplifier ON or OFF.
3.2 Input Selection
Use the Input Select Switch (XLR/RCA) on the rear panel to choose between the XLR balanced input and the RCA input. This allows for flexible switching without cumbersome plugging and unplugging.
3.3 Gain Adjustment
Use the Gain Switch (H/L) on the rear panel to adjust the amplification level. 'H' (High) provides more gain for harder-to-drive headphones, while 'L' (Low) is suitable for more sensitive headphones or sources.
3.4 Volume Control
Rotate the Volume Knob on the front panel to adjust the output volume. The 50KAX2 potentiometer supports precise volume adjustment, better aligns with the auditory characteristics of the human ear, and delivers a linear listening experience.
3.5 Indicator Light
The indicator light on the front panel is dual-color; different colors indicate different input sources and gain levels, providing visual feedback on the amplifier's status.
4. Specifications
Detailed technical specifications for the YJCO E300 Headphone Amplifier:
| Feature | Specification |
|---|---|
| Model | E300 |
| Inputs | 1 x RCA, 1 x XLR |
| Outputs | 4.4mm / 3.5mm / 6.35mm / 4-pin XLR |
| Operating Voltage | DC-12V |
| Standby Power Consumption | 0.3W |
| Headphone Amp Chip | TPA6120A2 × 2 |
| Op-Amp | JRC5532DD × 4 |
| Total Harmonic Distortion (THD) | <0.001% |
| Signal-to-Noise Ratio (SNR) | 120dB |
| Frequency Response | 20-20KHz@1kHz (±0.3dB) |
| Measured Output Power | 330mW × 2 @ 22Ω 450mW × 2 @ 47Ω 470mW × 2 @ 100Ω 320mW × 2 @ 300Ω |
| Dimensions (WxHxD) | 150mm × 126mm × 42mm |
| Weight | 640g |
| Body Material | Aluminum |
| Certification | CE, RoHS |
5. Maintenance
To ensure the longevity and optimal performance of your YJCO E300 amplifier, please follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid using abrasive cleaners, solvents, or strong chemicals, as they may damage the finish.
- Environment: Place the amplifier in a well-ventilated area, away from direct sunlight, heat sources, and excessive moisture.
- Handling: Handle the unit with care. Avoid dropping it or subjecting it to strong impacts.
- Power Off: Always power off the unit and disconnect it from the power supply before cleaning or if it will be unused for an extended period.
6. Troubleshooting
If you encounter issues with your YJCO E300 amplifier, please refer to the following common problems and solutions:
- Unit does not power on:
- Ensure the DC12V power adapter is correctly connected to the DC Power Jack.
- Verify that the power adapter is supplying the correct voltage (12V) and has the correct polarity (5.5*2.5mm, center-positive). Using an incorrect power supply can damage the unit.
- Check if the power outlet is functional. - No sound or poor sound quality:
- Verify that your audio source is properly connected to either the RCA or XLR inputs.
- Ensure your headphones are securely connected to one of the output jacks.
- Check the Input Select Switch on the rear panel to ensure the correct input (RCA or XLR) is selected.
- Adjust the Volume Knob on the front panel.
- Experiment with the Gain Switch (H/L) on the rear panel to match your headphones' impedance and sensitivity.
- Ensure the audio source is playing and its volume is adequately set.
- If sound quality is poor (e.g., broken bass), try a different audio source or cables to rule out external factors. If the issue persists, it might indicate an internal component problem. - Indicator light not working or showing unexpected colors:
- If the light is off, check power connection.
- Refer to the operating instructions for expected indicator light behavior based on input and gain settings.
If the problem persists after trying these steps, please contact customer support for further assistance.
7. User Tips
Enhance your experience with these tips from other users:
- Burn-in Period: Some users report that the sound quality improves after an initial 'burn-in' period of approximately 1 hour of use, with low frequency and high-pitched sounds gaining a better sense of openness.
- Gain Settings: Experiment with the 'Low' and 'High' gain settings. If you feel the strength is not enough while listening at normal volumes, try switching to 'High' gain.
- Op-Amp Rolling (Advanced Users): The E300 is designed to allow for op-amp replacement for experienced users looking to customize the sound signature. If you plan to replace op-amps, you will need to remove the front and back screws of the case. Inside, there are 6 screws at the 4-pin XLR headphone terminal that need to be loosened. A thin, long driver is recommended for this task. Please note that modifying the device may void your warranty.
- Power Adapter: Remember that a 12V power adapter is not included and must be purchased separately. Ensure it matches the specified voltage and polarity.
8. Warranty and Support
For warranty information, technical support, or any other inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.
You can also refer to the official user manual PDF for additional details: View User Manual (PDF)