1. Introducció
This manual provides detailed instructions for the proper setup, operation, and maintenance of your Topping A50 III Headphone Amplifier. Please read this manual thoroughly before using the device to ensure optimal performance and safety. The Topping A50 III is a high-performance desktop headphone amplifier designed to deliver clear and powerful audio to a wide range of headphones.
2. Producte acabatview
2.1 Característiques clau
- NFCA Modules: Incorporates Nested Feedback Composite Amplifier (NFCA) modules, utilizing a voltage-current hybrid feedback architecture and Ultra-High Gain Feedback (UHGF) technology for enhanced DC and AC performance. This design supports driving low impedance headphones effectively.
- Connectivitat versàtil: Features both 6.35mm single-ended and 4.4mm balanced headphone output jacks. Input options include RCA single-ended and 6.35mm TRS balanced inputs, allowing for various audio source connections.
- Compatibilitat amb auriculars: Offers three gain selections (High, Medium, Low) to accommodate different headphone sensitivities. A low noise floor of 0.3uVrms ensures minimal interference, particularly for sensitive In-Ear Monitors (IEMs).
- Alta potència de sortida: Delivers a maximum output of 3500mW x 2, capable of driving most headphones to their full potential while maintaining a low distortion rate of less than 0.1% at high power levels.
- Disparador de 12 V: Equipped with a 12V Trigger input, enabling synchronized power on/off with other compatible audio devices.
- Integració del disseny: Shares a consistent design aesthetic with the Topping D50 III, allowing for a cohesive setup when paired together. The 12V Trigger functionality facilitates synchronized operation between these units.
2.2 Contingut del paquet

Figura 1: Contingut i dimensions del paquet
The Topping A50 III package includes the following items:
- Auriculars Topping A50 III AmpUnitat lificadora
- Adaptador d'alimentació de 15 V CC
- Adaptador de 6.35 mm a 3.5 mm
- Targeta d'informació del producte
2.3 Identificació de components

Figura 2: Disseny del panell frontal i posterior
This diagram provides a detailed labeling of all controls and ports on the Topping A50 III. The front panel labels include:
- Power switch & Gain switch button: Press to power on/off. Press and hold to cycle through gain settings (H, M, L).
- Gain indicator: LEDs indicating High (H), Medium (M), or Low (L) gain.
- 6.35mm headphone output jack: For single-ended headphone connections.
- 4.4mm headphone output jack: Per a connexions d'auriculars balancejades.
- Pom de volum: Ajusta el volum de sortida.
The rear panel labels include:
- Balanced 6.35mm TRS input (R, L): For balanced audio input from a source device.
- Single-ended RCA input (R, L): For single-ended audio input from a source device.
- Input channel switching (BAL/SE): Toggle switch to select between balanced (BAL) and single-ended (SE) inputs.
- Firmware upgrade interface (FW): Port USB per a actualitzacions de firmware.
- 12V Trigger In: Input for synchronized power control with other compatible devices.
- Power input (DC15V): Connect the provided 15V DC power adaptor here.
3. Instruccions de seguretat
- Do not expose this device to rain, moisture, or extreme temperatures.
- Assegureu-vos una ventilació adequada al voltant de la unitat per evitar el sobreescalfament.
- Use only the provided 15V DC power adaptor. Using an incorrect adaptor may damage the device.
- Avoid placing the device on unstable surfaces.
- No intenteu desmuntar ni modificar la unitat. Encarregueu tot el manteniment a personal qualificat.
- Mantingueu el dispositiu allunyat de camps magnètics forts.
- Always lower the volume before connecting or disconnecting headphones to prevent sudden loud sounds.
4. Configuració
4.1 Connexió de fonts d'àudio
The A50 III supports both balanced and single-ended audio inputs.
- Entrada equilibrada: Connect your audio source (e.g., DAC with balanced outputs) to the 6.35mm TRS (Tip-Ring-Sleeve) input jacks on the rear panel. Ensure the left (L) and right (R) channels are connected correctly.
- Single-Ended Input: Connect your audio source (e.g., DAC with RCA outputs) to the RCA input jacks on the rear panel. Ensure the left (L) and right (R) channels are connected correctly.
4.2 Connectar auriculars
The A50 III provides both balanced and single-ended headphone outputs.
- Sortida equilibrada: For headphones with a 4.4mm balanced connector, plug them into the 4.4mm headphone output jack on the front panel.
- Sortida d'un sol extrem: For headphones with a 6.35mm single-ended connector, plug them into the 6.35mm headphone output jack on the front panel. If your headphones use a 3.5mm connector, use the provided 6.35mm to 3.5mm adaptor.
4.3 Connexió d'alimentació
Connect the provided 15V DC power adaptor to the DC15V power input on the rear panel of the A50 III. Then, plug the adaptor into a suitable power outlet.
4.4 12V Trigger Connection (Optional)

Figure 3: 12V Trigger Connection Example
If you have another audio device with a 12V Trigger output, you can connect it to the 12V Trigger In port on the A50 III using a compatible cable. This allows the A50 III to power on and off synchronously with the connected device.
5. Instruccions de funcionament
5.1 Encès/Apagat
Press the power switch button on the front panel to turn the A50 III on or off. The gain indicator LEDs will illuminate when the unit is powered on.
5.2 Selecció d'entrada
Use the input channel switching toggle switch on the rear panel to select between Balanced (BAL) and Single-Ended (SE) audio inputs. Ensure the switch matches the type of input you are using.
5.3 Control de volum
Rotate the volume knob on the front panel clockwise to increase the volume and counter-clockwise to decrease it. Always start with the volume at a low level before playing audio to prevent hearing damage.
5.4 Configuració del guany
The A50 III offers three gain levels: High (H), Medium (M), and Low (L). To change the gain setting, press and hold the power switch button on the front panel. The corresponding LED (H, M, or L) will light up to indicate the selected gain. Choose a gain setting appropriate for your headphones:
- Baix (L): Recommended for highly sensitive headphones or In-Ear Monitors (IEMs).
- Mitjà (M): Suitable for most standard headphones.
- Alt (H): For less sensitive or high-impedance headphones that require more power.
6. Manteniment
- Neteja: Feu servir un drap suau i sec per netejar l'exterior de la unitat. No utilitzeu netejadors líquids ni materials abrasius.
- Emmagatzematge: When not in use for extended periods, store the device in a cool, dry place, away from direct sunlight and dust.
- Ventilació: Ensure that the ventilation openings are not blocked to prevent heat buildup.
7. Solució De Problemes
- Sense so:
- Check if the power adaptor is securely connected and the unit is powered on.
- Verify that the audio source is properly connected to the correct input (RCA or TRS).
- Ensure the input channel switch (BAL/SE) on the rear panel matches your audio source.
- Confirm that headphones are securely plugged into the correct output jack (6.35mm or 4.4mm).
- Increase the volume level on the A50 III and your audio source.
- Test with different headphones and audio sources to isolate the issue.
- So distorsionat:
- Reduce the volume level on both the A50 III and your audio source.
- Try a lower gain setting (L or M) if using sensitive headphones.
- Assegureu-vos que tots els cables estiguin connectats correctament i que no estiguin danyats.
- Check the audio source for distortion.
- La unitat no s'encén:
- Verify the power adaptor is correctly connected to the unit and a working power outlet.
- If using the 12V Trigger, ensure the connected device is powered on and the trigger cable is functional.
8. Especificacions

Figura 4: Especificacions tècniques detallades
The following table outlines the key technical specifications of the Topping A50 III Headphone Ampmés viu:
| Especificació | Valor |
|---|---|
| Nom del model | A50III |
| Conector d'auriculars | Jack de 6.35 mm, Jack de 4.4 mm |
| Tecnologia de connectivitat | Amb cable |
| Tecnologia de comunicació sense fils | No s'admet |
| Components inclosos | Cable (likely power cable and adaptors) |
| Dispositius compatibles | Desktops, Laptops, Headphones, Audio Devices |
| Mètode de control | Botó, pom |
| Nombre d'articles | 1 (unitat principal) |
| Fabricant | LEAUDIO CO. |
| Pes de l'article | 2 lliures (aprox. 0.91 kg) |
| Dimensions del paquet | 6.8 x 6.5 x 5.8 polzades (aprox. 17.3 x 16.5 x 14.7 cm) |
| Número de model de l'article | LE-TP-A50III |
| Color | Negre |
| Control de soroll | Cap |
9. Garantia i Suport
For warranty information and technical support, please refer to the documentation included with your product or contact the manufacturer, LEAUDIO CO., or your authorized dealer. Keep your purchase receipt as proof of purchase for warranty claims.





