QULOOS - MUB5 Portable R2R DAC/AMP

The MUB5 features an advanced discrete R2R segmented ladder DAC architecture that divides the 24-bit digital audio signal into a 19-bit lower segment and a 5-bit higher segment. This design uses 178 ultra-precise resistors matched to a tight 0.01% tolerance, along with 40 dedicated resistors to eliminate internal switch resistance, ensuring highly accurate and natural digital-to-analog conversion. Supporting high-resolution PCM and DSD playback, the DAC offers customizable sound tuning with its programmable oversampling (OS) and no-oversampling (NOS) filter modes. Additionally, DXD x2 upsampling minimizes signal loss and group delay, while ultralow jitter and zero-crossing distortion designs deliver clear audio reproduction with exceptional dynamic fidelity.

This Premium DAC/Amp incorporates 20 groups of isolated LDO power supplies, each independently powering different sections of the device to minimize noise and interference. It uses an LTC6655 voltage reference for exceptional power stability, ensuring clean and accurate signal reproduction. Multiple NDK/QA661 oscillators provide highly precise clocking, reducing jitter for improved audio clarity. A three-way power supply architecture separates power delivery for the R2R ladder and clock sections, preventing cross-contamination. The USB input is housed in an all-metal isolated casing to shield the audio path from USB noise. The design also features premium components such as large film capacitors, high-end electrolytic capacitors and WIMA inductors, all contributing to a high-quality power environment for refined sound performance.

QULOOS has equipped MUB5 with OPA627 operational amplifier which delivers clean, powerful and detailed audio signals to connected IEM’s/Headphones. Its discrete FZT transistor headphone amplifier provides dynamic capabilities suitable for a wide range of headphone types. Users can select from Low, Medium, and High gain stages in accordance to the sensitivity and impedance of their headphones. This feature ensures optimal performance and volume control. The MUB5 is capable of delivering up to 2500mW of power into 32Ω loads, making it compatible with both sensitive in-ear monitors and demanding full-size headphones. For connectivity, it offers multiple output options including a 4.4mm balanced jack, a 3.5mm single-ended jack and a preamp-level output.

Crafted with a CNC-machined enclosure, the MUB5 available in premium “Ti-Gold” finish, which provides both durability and a refined aesthetic. Its design incorporates NDCS (Noise-Displacement and Conversion Shielding) electromagnetic interference protection to minimize external noise and maintain signal purity. Inside, extensive shielding is implemented with large-area film capacitors, thick power delivery wires and secure connectors to ensure consistent and reliable audio performance. The solid build and high-quality hardware contribute to the product's longevity, making it a dependable choice for demanding audiophiles seeking both performance and resilience.