QLS MUB1 Portable DAC / AMP

MUB1 Portable HiFi USB and Bluetooth DAC & Headphone Amp

Battery local pure power supply | 1100mW/ch high output power
Optional Super-high gain | NDCS shielding | Wurth inductor
Panasonic electrolytic capacitor | Femtosecond crystal | BUF634*4 output

Music listening, enjoyable and practical.

Listening impressions from Clark: MUB1’s general sound design is consistent with QA361 and QA390LE. With high sound density and a strong sense of structure, this music is warm, sensitive, steady, and long-lasting to listen to. It has excellent hierarchical details and vertical spatial feeling.

The PCB area and power supply of MUB1’s DAC&headphone amplifier section are greater than those of QA361 since it lacks a player part. MUB1 is an inch long and an inch strong, and it has a few advantages over QA361 in terms of sound quality. These advantages include a larger sound field, a more complete sound structure, a sound that is softer and more durable to listen to, greater sound dynamics, and more solid mid- to low-frequency reproduction.

How could such lovely and sweet music not make you feel something? Therefore, I believe that each enthusiast needs at least one MUB1.

Main design highlights

Note: A patent application of FiiO has been submitted for the CAR mode, and FiiO has permission to utilize the CAR mode of this product.

Five major application scenarios

24Bit 96K high-definition Bluetooth

Receive mobile streaming input without bundling for convenient and good enough sound

Mobile phone connection DAC&Headphone amplifier

Pure and abundant local battery power supply
No anxiety of phone battery with excellent sound

Office desktop PC-HiFi

Desktop small DAC and Headphone amplifier all-in-one machine
Act discrete enough without discrete voice

Car HiFi audio source

Coaxial / optical input to DSP, or AUX to host
CAR mode with good sound, more convenient

Home speaker system

Expand high sound quality mobile streaming input function
Simple enough, practical enough, and good sound enough

Three keys to good sound in MUB1

2.75 times the power of QA361 dual high mode

Sufficient power margin
The sound is more easy and adaptable
MUB1 balance port output power up to 1100mW/ch
It is much greater than the output power of many flagship players
Put fine timber to petty use

Super-Hign gain is 3-4 times voltage amplification with high gain

Modern machines pursue testing parameters
The sound gets more flat and ordinary as the gain drops
MUB1 returns to traditional old machines with over 10 times voltage amplification
Outstanding musical taste causes listeners to unconsciously dance to the music
Realistic visuals set to vibrant, exuberant music that seems just out of reach

HiFi performance needs to be ensured by the materials used

Use desktop HiFi materials
Make MUB1 sound more like a real HiFi device
Audio electrolytic capacitors are rarely used in portable goods.
Panasonic electrolytic capacitor with rare sound dense sense of space
The BUF634 provides a more scaled sound
Low internal resistance Wurth inductor with stable and atmospheric sound

Sound created by power supply

Design of a power supply that is broadband, low noise, high transient, and low in internal resistance
Up to 14 power sources provide independent power supply for each circuit part, ensuring purity and stability
This battery cable is combination of HiFi wires using different materials, resulting in a noble sound.
Analog power supply voltage of up to 16V at Super-high gain, with sound more open.
Design of a low noise power supply with analog and digital separation, achieving seamless sound

Oscillator is the soul of sound

MUB1 selected femtosecond crystal oscillator
High precision, with a nominal jitter of only 150fs
Good crystal oscillator with stable sound

Measurement based on APX555 audio analyzer

Sound quality on Bluetooth is already adequate

Bluetooth 5.0, CSR 8675 optimization module with good sound
Supports 24Bit/96kHz high-definition Bluetooth
Specially optimized Bluetooth overall design
The information content and sound density are already very close to USB connections
NDCS dead corner free circuit shielding technology
Stable connection without interference, pleasant to listen to, and better to use

USB DAC&Headphone amp with full platform support

Support 32Bit / 384kHz, DSD256
Android, iPhone, and tablet ready to use
Local batteries are pure and plentiful. the sound quality is higher
ASIO driver, compact PC HiFi all-in-one machine for Windows desktop
Act discrete enough without discrete voice
UAC2.0, Linux, MacOS drive free,
The USB OTG output of HiFi player can also be used
Support UAC1.0

CAR mode that simplifies car audio upgrades

MUB1 has optical and coaxial outputs, and Line out can also be set
One line connection to the car audio DSP is sufficient, simple and convenient
Connect to the host Aux in through level setting Aux out
Both Apple and Android phones can increase the volume on the phones, making it more convenient
In CAR mode, following USB power to automatically switch on and off, more worry free

Four Cirrus Logic flagship DAC chips

Start liking Cirrus Logic DAC due to the good sound quality of CS4398
It has the uncommon natural, enjoyable, and smooth sound of a contemporary DAC
The new generation CS43198 and 43131 have better designs
The sound is more precise and realistic thanks to the special NOS option.
Using 4 CS43131, eight channel DAC designed as two channels
Each four channel DAC is for providing more detailed and louder sound

MUB1 overall distortion is better than the theoretical value of DAC chips

Flagship level dynamics

Compared to the USD $2000 flagship HiFi player, it is not inferior

Measurement based on APX555 audio analyzer

Almost “zero” noise

MUB1, whether single ended or balanced, the medium and low gain noise <2uVrms
50% of 4uVrms noise at low gain only for QA361
The signal-to-noise ratio is as high as 132dB
High sensitivity headphones also struggle to hear background noise

Key Interface Description

Description of 3.5 coaxial line foot position

                                                Signal / Signal +                GND / Signal –

Product parameters

Note: The above audio parameter measurements are based on the APX555 audio analyzer, with the internal battery fully charged and F0 filtering mode, tested in the qianlongsheng Laboratory environment.