Heareal B2 900MW Headphone Amp DAC Class-A Headphone Amplifier Pluggable Op Amp Easy to Replace

Heareal B2 900MW Headphone Amp DAC Class-A Headphone Amplifier Pluggable Op Amp Easy to Replace

Features:
- Portable Hifi class A headphone amp
- Large driving force as excellent as that of desktop headphone amp
- 18-hour endurance time
- Dedicated boost circuit and optimized circuit
- The raised frame design protects volume knob and audio cable plug from damage
- Low noise power management circuit: integrated lithium battery charge management and boost circuit
- Each channel uses one pair of audiophile transistors MJE15033
- Powered by original 3400mah 18650 lithium battery for Panasonic. More reliable and stable than ordinary laminated lithium batteries
- Boost circuit boosts the lithium battery 3.7V to 12V for the op amp stage and the pure class A current amplifying stage, enabling pure and quiet sound bottom
- Selected volume potentiometer ensures the balance of the left and right channels in the low volume state, which is difficult to realize for ALPS potentiometer
- 2134 op amp: It is not only a pure class A circuit structure, but more importantly, it has no large loop negative feedback,with rich mid-high frequency details and high resolution. With the low distortion of 2134 op amp, the sound field is wide and the music is very real
- Thanks to replaceable op amp, you can plug and replace the op amp
- All the products have passed strict tests before delivery
- Type-C charging port more efficient that Micro USB port
- Due to its circuit structure with very low noise, it can be used as a desktop amp. While charging, you can listen to music (recommended to use a linear power supply to prevent noise floor)
- Portable design and long working hours allows you to enjoy high-quality music anytime, anywhere
 
Front Panel:
- IN (3.5mm input): connect to mobile phone, desktop PC, tablet, etc.
- OUT (3.5mm output): connect to headphones
- VOLUME: volume knob with switch function

Rear Panel:
- Charging Port: Type-C
- Charge: Charging indicator
- Full: Finished charging

Specifications:
- Brand: Heareal
- Model: B2
- Output power: 900mW/32Ω; 350mW/150Ω (1KHZ sine wave equivalent undistorted power)
- Headphone load range: 16-300Ω
- Frequency response: 20HZ-30KHZ
- Distortion rate: 0.0037%
- Signal-to-noise ratio: 103DB
- Battery capacity: 3400mAh
- Endurance time: about 18 hours of continuous playing
- Charging port: TYPE-C fast charging interface
- Charging time: about 3.5h
- Input/output port: standard 3.5MM headphone jack
- Op amp chip: 2134 (can be plugged and replaced)
- Dimensions: 67 x 120 x 26mm/2.6 x 4.7 x 1"
- Net weight: 0.2kg/0.4 lb

Compatible Op Amp:
Just plug and play. Support op amp such as OPA2604, OPA2107, AD712, AD827, LME49720NA, MUSES 8820, MUSES 8920 and MUSES02

Package Included:
- 1 x Portable Headphone Amp
- 1 x USB Type-C Charging Cable
- 1 x User Manual