Oriolus BA20

New Oriolus BA20 - BA20

Oriolus BA20 4.4mm Balanced/3.5mm Single-ended HiFi Portable Headphone Amplifier


BA20 is an input and output fully balanced pure headphone amplifier, using 4.4mm balanced and 3.5mm single-ended input and output. 3.5mm input is connected to 4.4mm output, the circuit is BTL, and the maximum output of this machine up to 500mW, which can drive 8-600ohm headphones; the op amp buffer can be removed without tools (the accessory has a replaceable buffer module and a combination of op amps), user can change the configuration according to their preferences; use 3.7V/4000mAH polymer lithium battery, 15 hours of battery life (configuration will affect battery life), 4 hours of charging.

Functions introduction

1. Power switch
2. Power indicator light
3. Gain switch +3dB /0dB /+9dB
4. Headphone output 4.4mm balanced
5. Headphone output 3.5mm single-ended
6. Volume potentiometer
7.4.4mm balanced input
8.3.5mm single-ended input
9. Power supply, choose BATT for internal battery power supply, and EXT for external USB power supply
10. Charging interface, can power the whole machine
11. Charging indicator light, charging lights up, full off

Balanced (32ohm)

1. Frequency response: 10Hz-20kHz (± 0.5dB)

2. THD+N: 0.0005%

3. SNR: -120dB

4. Output power: 500mW

5. Separation: -94dB

6. Output impedance: 0.2ohm

7. Gain: +3dB / 0dB/ +9dB

Single-ended (32ohm)

1. Frequency response: 10Hz- -20kHz (±0.5dB)

2. THD+N: 0.0005%

3. SNR: -117dB

4. Output power: 220mW (32 OHM)

5. Separation: -74dB

6. Output impedance: 0.2 ohm

7. Gain: +3dB / 0dB / +9dB

8. Size: 132mm x 55.6mm x 20.6 mm (including knob)

9. Weight: 180g


1. The charging indicator lights up in red when charging, and goes out after being fully charged. The charging time is about 4 hours.

2. The power indicator light is always on after starting up, flashes when the battery voltage is too low, and goes out after the battery is used up or shut down. The continuous use time of the whole machine is related to the combination of operational amplifiers used, and the longest can exceed 20 hours.

3. When using external USB power supply, the machine can be used while charging.

4. Description of the minimum volume of the potentiometer

This machine uses the Japanese ALPS 4 potentiometer, and the shipping conditions are -40dB consistent, that is, the rotation to the 8 o'clock position is basically consistent, and the bias below 8 o'clock is a normal phenomenon.

5. After replacing the op amp, please carefully check whether the single and double op amps are correct, whether they are inserted reversely, whether they are inserted in place, etc.


4.4mm cable

Charging Cable

Op Amp Box (including NE5534 Bypass)

47 buffer

Transistor buffer

Pass-through board

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Due to the impact of the COVID-19 pandemic, global international shipping will delays. The delay at our Hong Kong post office is very serious, so we have changed to other fastest or most efficient international shipping. Now the normal estimated delivery time may be delayed by about 1-2 weeks. In some countries where is higher free-tax rate, we will provide free courier service as much as possible.

Free Shipping

All listed items will be shipped though Registered Airmail with tracking number if there is no extra shipping method option listed or shipping description in the product page.

Economy shipping: Will be shipped without tracking number.

Registered Airmail : Will be shipped via such as Hong Kong post , Deutsche Post , Netherlands Post , Singapore Post, you can leave us a message if you have any requirement about the shipping method .

It will be shipped via Hong Kong Post by default, Europe countries can choose to be shipped via Deutsche Post or Netherlands Post, it is also FREE, pls leave us a message if needed.

Express service: Will be shipped via DHL/EMS/UPS/FedEx

  • Views: 367
  • Brand: Oriolus
  • Product Code: BA20
  • Availability: In Stock
  • $329.00

Tags: Oriolus BA20