7HZ SEVENHERTZ 71 Portable Headphone Amplifier DAC Dongle with AK4377 Chip
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Specifications
- Brand Name
- NoEnName_Null
- Output Type
- USB
- Built-in Battery
- Yes
- Recommended Headphone Maximum Impedance
- 32 - 50 Ohm
- Input Type
- Micro-USB
- Origin
- Mainland China
- High-concerned chemical
- None
- Signal To Noise Ratio
- 106DB
- Bluetooth
- Yes
- Type
- Mini Amplifier
- Model Number
- 7HZ SEVENHERTZ 71
- Output Voltage
- 70mW
- Package
- YES
Product Description
7HZ SEVENHERTZ 71 Portable Headphone Amplifier DAC Dongle with AK4377 Chip, High-End OCC Cable, Supports Android 5.1 And Above
Description：
【AKM AK4377 Chipset】7HZ SEVENHERTZ 71 adopts AKM's AK4377 chip to process digital signals. It is smaller than other chips and uses 36-pin CSP packaging, which requires less space on the circuit board. The upgrade AK4377 chip can analyze each format audio signal. For better sound quality, a 32-bit digital filter is integrated into the circuit, allowing a lower distortion rate and a wider sound field.
【Applicable to Android 5.1 or Higher Version And Lightning Connector】The 7HZ SEVENHERTZ 71 Portable Headphone Amplifier is small but powerful. It can effectively improve the sound quality representation of devices such as mobile phones, music players, etc. SEVENHERTZ 71 is mainly applied to mobile phones and it is suitable for Android 5.1 and above. Besides, SEVENHERTZ 71 can compatible with Apple Lightning connection.
【High-end 4-pin 36-core OCC cable】As a portable headphone amplifier, the 7HZ SEVENHERTZ71 not only adopts an upgraded DAC chip but was also designed with high-end cables. 7HZ SEVENHERTZ 71 cables use four 36-core OCC cables, which can transmit digital and analog signals losslessly. The cables are hand-woven and extremely robust, enhancing the resistance to breakage.
【Battery-Free Design, Plug And Play】The 7HZ SEVENHERTZ 71 Potable Headphone Amplifier used a battery-free design. The AK4377 chip is easy to drive and the impedance of the circuitry in this amplifier is also low, meaning that not much power is required. This means that this potable amplifier can be driven with low power. The battery-free design means that there is no need to worry about running out of power during use. You can use this Potable Amplifier anytime, anywhere.
Specification:
Model Name: 7HZ SEVENHERTZ 71
DAC Chip: AK4377
THD+N: -108dB/0.0004%@32 ohms
Output Power: 70 mW@32 ohms
Output Voltage: 1 Virms@32 ohms
Sensitivity: 106 dB
Frequency Range: 20 Hz-40 kHz
Noise: <0.9 μV
PCM Decoding: 32bit/384KHz Maximum
DSD: DSD64; DSD128 (DOP)
Pros & Cons
Pros
- Uses the high-quality AK4377 audio chip for clear, low-distortion audio output
- Compact portable design with built-in battery for on-the-go use
- Supports both wired Micro-USB and Bluetooth connectivity for versatile use
- Optimized for 32-50 ohm headphones for balanced audio performance
Cons
- Only compatible with headphones in the 32-50 ohm impedance range, limiting use with other headphone types
- No official brand name is listed, so no formal warranty or support is available
- Exact battery life and total weight are not provided in the product details
- Compatibility with iOS devices is not explicitly listed
Common Questions
What audio chip does this portable headphone amplifier DAC use?
It uses the AKM AK4377 chipset for high-quality digital audio processing.
What are the physical dimensions and weight of this dongle?
Exact physical dimensions and weight are not listed in the provided product details, but it is designed as a compact portable dongle.
What input and output types does this device support, and is it compatible with most smartphones?
It uses a Micro-USB input, USB output, and built-in Bluetooth connectivity; it supports Android 5.1 and above, with compatibility for other devices not fully listed.
What is this headphone amplifier designed for?
It is designed to boost audio quality for headphones, with a recommended impedance range of 32-50 ohms.
Where is this DAC amplifier shipped from and manufactured?
It is manufactured and shipped from Mainland China.
Product information last updated on December 10, 2025