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The Muse HiFi M5 Ultra is a portable DAC with a hybrid headphone amplifier, designed for the conversion and amplification of high-resolution audio streams on the go. It is based on a customised ES9038Q2M architecture, compatible with up to PCM 32bit 768kHz and DSD512, and combined with JAN6418 tubes, allowing for a combination of conversion precision and analogue processing, whilst the integration of a dual Accusilicon oscillator ensures low-jitter reclocking to stabilise signal reconstruction. This technical foundation is extended by Bluetooth support via a QCC5125 chip, offering the convenience of wireless connectivity whilst maintaining CD-quality sound.
The M5 Ultra is based on a “6418” architecture developed around a custom ES9038Q2M chip, created in collaboration with ESS, to seamlessly integrate a digital-to-analogue conversion section with JAN6418 tube amplification. This approach aims to limit electromagnetic interference caused by Bluetooth transmissions, thereby preserving the integrity of the output signal whilst supporting input signals up to 32bit 768kHz PCM and DSD512.


The JAN6418 tubes are integrated with a dedicated mechanical suspension system, comprising specialised damping components and a decoupled design, to minimise vibrations transmitted to the circuitry. This stabilisation reduces microphonic effects whilst maintaining consistent electrical conduction, resulting in more stable sound reproduction when used on the go.
The digital signal management system is based on two Accusilicon AS318B oscillators (45.1584 MHz and 49.152 MHz), which provide a low-jitter reference clock for the entire architecture. This reclocking standardises the timing of the audio stream prior to conversion, thereby reducing synchronisation errors and improving the consistency of the processed signal, without the need for corrective processing at a later stage.


The integration of the Qualcomm QCC5125 SoC, based on a dual-DSP and dual-core CPU architecture, ensures the simultaneous management of audio streams and system processes, stabilising Bluetooth transmission whilst maintaining low latency. This hardware platform supports LDAC and aptX Adaptive codecs, thereby expanding wireless applications whilst maintaining a transmission quality suitable for high-resolution audio streams.
Technical characteristics
| Specifications | |
|---|---|
| Product type | DAC / Headphone amplifier |
| Inputs | 1x USB-C (Data) 1x USB-C (Power supply) 1x Bluetooth |
| Outputs | 1x Single-ended 3.5mm headphone jack 1x Balanced 4.4mm headphone jack |
| Amplifier component | Tubes JAN6418 Transistors |
| DAC chip | ES9038Q2M |
| Supported sampling rates | PCM up to 32bit 768kHz DSD up to DSD512 |
| Supported codecs | SBC, AAC, aptX, aptX-LL, aptX-HD, aptX Adaptive, LDAC |
| Battery | 3000mAh |
| Fast charging | QC4.0+PD |
| General | |
|---|---|
| Dimensions | 203 x 166 x 68mm |
| Weight | 570g |
| Color | Black |
| Package | 1x Muse HiFi M5 Ultra 1x USB-A to USB-C cable 1x USB-C to Lightning cable 1x USB-C to USB-C cable |
| Input | Bluetooth |
| Input | USB |
| Output | Jack 4.4mm |
| Output | Jack 3.5mm |
| DAC / ADC Chip | ES9038Q2M |
| Max sampling rate | 768kHz |
| Max sampling rate | DSD512 |
| Color | Black |
| Class | Tube amp |
| Networking | No |
| Remote Control | No |