Tempotec Variations V1: The Budget Swiss-Knife DAP

Wow, it's been a while since I last updated this blog, this is actually my first review after a two-year hiatus. I won't be posting as frequently as I did back in 2023, but I'll definitely drop some impressions here whenever I pick up new audio gear. This time, we'll be reviewing the Tempotec Variations V1.

Inclusions

• TempoTec V1 Digital Audio Player (DAP) with a pre-applied screen protector
• Extra screen protector film
• USB-A to USB-C cable (standard length) 
• USB-C to USB-C cable (short length)
• Card / insert explaining the volume limit unlock (instructions on bypassing or unlocking the volume restriction)
• User manual / paperwork 

Build Quality, Ergonomics, and Design

Features piano-like textured or faux carbon-fiber metal back plate

Also features 2.5D tempered glass front panel

The V1 has 4.4mm and 3.5mm ports!

The V1 is a lightweight, compact, and ergonomic audio player that easily fits in your pocket especially if you skip the included clip case. I thought the chassis for aluminum, it is actually made of plastic, so expect it to be a bit more prone to dents and scratches. That said, the solid glass screen and metal backplate give the device a sturdy, substantial feel without weighing down your pocket.

Its tiny frame makes one-handed grip and operation effortless on my end. The 2-inch touchscreen can feel cramped if you have larger fingers, I have slimmer fingers so I had no trouble navigating it but I still find it a bit challenging to navigate some parts of the screen, particularly when tapping icons near the edges of the display. The physical buttons also offer crisp, tactile feedback with no rattling or brittle feel. Overall, for the price, the V1 offers incredible bang for your buck.

As a non-Android DAP, it relies entirely on a microSD card for local playback. Unlike DAPs I used in the past like the A&K SR25, Sony A35, Snowsky Echo Nano, and Echo Mini, it doesn't include any built-in internal storage. That isn't a dealbreaker for me since I've owned similar microSD-only players in the past, like the FiiO M3K, and I rarely store music on internal memory anyway.

Specifications

The V1 is powered by dual Cirrus Logic CS43131 DACs and runs on a Linux-based HiBy OS, paired with a 2-inch IPS touchscreen. It features a 3.5mm single-ended output (123mW @ 32Ω, 2VRMS, SNR ≥ 128dB) and a 4.4mm balanced output (215mW @ 32Ω, 4VRMS, SNR ≥ 131dB) output which is a surprise for a budget DAC. It supports Native DSD256, PCM up to 32-bit/384kHz, and MQA 8X, alongside a 10-band Parametric Equalizer (PEQ).

SOUND

The V1 is surprisingly good for its price as it features a neutral-warm sound signature with a clean and natural sound.

Bass: The bass is clean, punchy, and well-balanced. It doesn't feel boosted, sitting right in the sweet spot for my preferences. By comparison, I remember my old Sony A35 having a noticeably warmer, more boosted low end so much so that I eventually had to sell it, as it pushed my already warm gear into overly dark, veiled sound. 

Mids: The mids give the V1 a forward, natural presentation. Vocals have great body and sound organic, while the upper-mids avoid any harshness, offering solid detail and presence.

Treble: The treble is smooth, clean, and forgiving, avoiding any sharp peaks or harshness. While it doesn't offer ultra-detailed micro-retrieval, it provides decent resolution for a player in this price range.

Technicalities

Soundstage: The soundstage is fairly average. While it offers a decent headstage with enough openness to avoid feeling cramped, it doesn't stretch quite as wide or open as higher-end DAPs.

Imaging: Imaging is easy to follow and pinpoint, it allows individual instruments and vocals to solidly establish themselves into their respective placements within the mix. Instrument separation is also more than enough for a DAP this cheap, keeping complex, dense arrangements on the tracks coherent without smearing details together.

Software, OS, and Navigation

Software:The V1 runs on HiByOS, a proprietary, custom Linux-based operating system. The UI is very minimalistic, the home screen displays large, grid-based, simple icons to jump between Music, Streaming, Phone DAC, PC DAC, BT DAC, and Settings. Swiping down from the top of the screen reveals a shortcut menu for toggling Wi-Fi and Bluetooth, switching gain levels, and accessing quick playback controls.

Despite its minimalistic UI, the V1 suffered heavily from poor optimization out of the box, which led to widespread user complaints. Because of those issues, I initially avoided this DAP, worried it would be a waste of money, that is, until dedicated enthusiasts built a custom firmware fix that put the V1 squarely back on my radar. The Sonix OS enters!

Important Notice: Installing unofficial custom firmware like Sonix Player (SonixOS) on the TempoTec Variations V1 carries real risks to your device. While it offers UI improvements over stock HiByOS, proceed at your own risk and keep the following hazards in mind before flashing

The SonixOS

V1 running SonixOS

The new software completely transformed the V1, making it noticeably snappier and much easier to use. Out of the box, stock HiBy OS on low-power budget chipsets often suffers from interface lag, stuttery scrolling, and sluggish touch response especially when loading heavy album art or large libraries. Sonix Player strips away that bloat, introducing cleaner UI elements, better layout organization, and far smoother interactions. It also brings updated handling and configuration for network streaming services like Tidal and Qobuz, making the whole user experience feel polished.

Battery Life & Usage

The V1 is equipped with a 1,400mAh battery. In my testing, I managed to get around 8 to 9 hours of playback using the 4.4mm balanced output. I haven't had the luxury of running another 8-hour drain test on the 3.5mm single-ended output or over Bluetooth, so you'll need to cross-reference with other reviewers for battery figures on those connections.

A full charge takes roughly 2 hours. Since the V1 doesn't support fast charging, I recommend sticking to a standard, lower-wattage charging brick just to play it safe. I do not need to state the obvious but a bit of warmth during charging is to be expected, the good news is that the V1 never got excessively hot in my experience when I am using and listening music.

Conclusion

The TempoTec Variations V1 is a prime example of how far budget audio gear has come. It certainly has its share of quirks and weaknesses.

However, once you look past those compromises and get the firmware sorted out, the value here is hard to beat. Packing dual CS43131 DACs, a surprisingly capable 4.4mm balanced output, a clean neutral-warm sound signature, and solid battery life into a pocket-sized frame makes it an easy recommendation for anyone wanting a dedicated, distraction-free music player without breaking the bank.