M12 Mobile Hi-Fi Headphone Amplifier with DAC

M12 · Start Your Mobile Hi-Fi Journey

To greet mobile lossless music in the 5G era, Questyle released the M12 in 2021, a mobile Hi-Fi headphone amplifier with DAC, which integrates
Questyle’s core technology and carries on the gene of mobile Hi-Fi feature. M12 allows all mobile phone users to break through limitations of technology, cost and size of the audio circuit integrated into mobile phones, and feel free to enjoy lossless music from streaming anytime in any place.

Now, let M12 take you to your mobile Hi-Fi journey!

Independent SiP Current Mode Amplifier
Module Powerful Headphone Amp

The patented “Current Mode Amplification” technology is the fundamental difference between Questyle’s hardware and other terminals. The amplifier is to a headphone system what the engine is to a car. As the “engine” amplifier, it has a crucial impact on the improvement of sound quality. Benefiting from our self-developed SiP Current Mode Amplifier module, M12 is free from the power limit of operational amplifier chips and provides a totally different sound performance with the ultra-low distortion level of 0.0003%. It has ultra-high current output power and excellent sound control. It will fully dig out the potentiality of your headphones.

Smart Detection of Impedance Automatically self-adjust to fit your headphones

When M12 is plugged into a headphone, the built-in smart detection system will start automatically to detect the headphone impedance and self-adjust to
fit the headphone. Just like the auto shift of a car, M12 will self-adjust to high power level to drive high-impedance headphones with the Gain indicator showing red light, providing excellent dynamic performance. When driving low-impedance and high-sensitivity earphones, M12 will reduce the output level and accurately match their impedance, with the Gain indicator showing green light for low impedance.

Technology

Questyle and ESS team spent two years developing the mobile headphone amplifier with DAC and it will perform better than expected. The logo of both Questyle and ESS are put on M12 in order to mark the first cooperation between the two companies. ES9281AC, the ESS flagship USB DAC chip built in M12, has decoding capability up to PCM 384kHz/32bit and DSD256. Whether it is the deepest bass sound of the organ in European cathedrals or the strongest bass and guitar melodies in hard rock, M12 will always be able to capture the details buried deep in the soundtrack.

Excellent Audio Performance

FFT @1kHz sine wave Po=5mW
Data from Audio Precision AP2722

Background noise of M12 is lower than -130dB

Frequency response curve: 0dBFS 192k/24Bit high
sampling rate files Data from Audio Precision AP2722

M12 achieves real Hi-Res with the ultra-wide frequency range
more than 20kHz

Support MQA Decoding

MQA (Master Quality Authenticated): Questyle M12 includes MQA Renderer technology, which can connect to an MQA Core signal and complete the final unfold of an MQA file. The M12 LED glows magenta to indicate that the unit is rendering an MQA stream or file. This delivers the final unfold of the MQA file.

MQA is a new technology which removes digital distortion and packages audio streams efficiently into files that are small enough to stream. It can be integrated into your audio products in a very smart way and achieves the highest quality playback. MQA delivers the original sound, in the highest quality, using less data, and authenticates provenance.

Perfect Compatibility
Plug and play, enjoy your Hi-Fi journey

M12 is fully compatible with Android 5.1 and above systems on popular smart phones and tablets. For PC, it supports Mac OS and Windows 10 version 18.3 and above with no additional driver installation required.

Specifications

Material: CNC machined aluminum
Color: Black
Size: 51[L] X 16.5[W] X 8.1[D] (mm)

Operating System Required:
Android phone and pad: Android 5.0 and above
PC: Win10 1803 and above
Apple cellphone: iOS (You need to buy an OTG cable for Lightning to Type-C.)
Apple computer: Mac OS

DAC Capability of M12:
PCM: 32kHz – 384kHz (16/24/32Bit)
DSD: DSD64(1Bit 2.8MHz) , DSD128(1Bit 5.6MHz), DSD256(1Bit 11.2MHz)

Output Power:
Built-in smart detection circuit will automatically self-adjust the output power to fit different
the impedance of headphones.
RL=16Ω，Po=46.11mW;
RL=32Ω，Po=26.71mW;
RL=300Ω，Po=12.26mW;
When the detected impedance is less than 70Ω, M12 will self-adjust to low gain output.
When it is more than 70Ω, M12 will self-adjust to high gain output.
When it is more than 600Ω, M12 will automatically switch to a 2Vrms line out.

Frequency Response: ±0.1dB(20Hz-20kHz)
THD+N: 0.0003%
DAC: ESS flagship USB DAC chip ES9281AC

Questyle M12 Portable DAC/Amp (Open Box)

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