As smartphones continue to phase out the 3.5mm headphone jack, USB-C DAC dongles have become one of the simplest ways to unlock superior sound quality on your mobile devices. Within NICEHCK’s popular NK1 series, the NK1 Max and the newly upgraded NK1 Ultra stand out as two especially compelling options.
Both pack the same well-regarded CX31993 DAC chip, but the NK1 Ultra brings a handful of thoughtful upgrades that push the listening experience up a notch. So, which one deserves a spot in your pocket? Let’s take a closer look and find out.
A Quick Overview
Both the NK1 Max and NK1 Ultra are designed to deliver high-quality audio in a compact, portable form factor. They support:
- Up to 32-bit/384kHz audio decoding
- Premium silver-plated OCC copper cable
- Plug-and-play compatibility with smartphones, tablets, and laptops
The biggest differences lie in the amplifier stage and overall audio performance.
We can see through the sheet and confirm the NK1 Ultra brings a clear step up across several key performance metrics.
Double the Output Power
NK1 Max: 63mW@32Ω
NK1 Ultra: 122mW@32Ω
With nearly double the juice of the NK1 Max, the Ultra brings you:
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Tighter control over demanding IEMs
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Stronger bass slam and dynamics
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More headroom when you push the volume
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Better compatibility with higher-impedance headphones
If you’re running multi-driver IEMs or power-hungry cans, the NK1 Ultra gives you a clear, audible edge. For everyday earbuds and casual listening, though, the NK1 Max already serves up more than enough power to keep things sounding great.
Improved Dynamic Range
Dynamic range reflects a device's ability to reproduce both subtle details and powerful musical peaks.
NK1 Ultra: 115dB
NK1 Max: 111dB
The NK1 Ultra's improved dynamic range translates into:
- More spacious soundstage
- Better instrument separation
- Enhanced layering and depth
- More realistic musical presentation
Listeners who enjoy orchestral recordings, live performances, and high-resolution music will especially appreciate the improvement.
Lower Distortion, Cleaner Sound
THD+N:
NK1 Ultra: -98dB
NK1 Max: -95dB
Lower distortion means cleaner, more accurate sound — it's really that straightforward.
With the NK1 Ultra, you're getting:
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A darker, quieter background
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Vocals that feel clearer and more present
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Better detail retrieval across the board
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Treble that stays smooth and refined, even when pushed
On paper, the numbers might not look dramatic, but if you're listening on high-res earphones with a bit of a trained ear, that extra touch of refinement tends to come through nicely.
Which One Should You Choose?
Choose the NK1 Max if:
- You want the best value for money
- You mainly use efficient IEMs
- You listen to streaming services and everyday playlists
- You prefer a balanced and affordable upgrade
The NK1 Max remains an excellent choice for users seeking a noticeable improvement over their smartphone's built-in audio without spending extra on flagship-level performance.
Choose the NK1 Ultra if:
- You want the best possible sound quality from the NK1 series
- You use high-end IEMs or demanding headphones
- You prioritize resolution, dynamics, and detail
- You want stronger output power and future-proof performance
With its upgraded SGM8262 amplifier, higher output power, wider dynamic range, and lower distortion, the NK1 Ultra represents the most capable dongle in the NK1 lineup.
Final Verdict:
The NK1 Max is a fantastic bang-for-your-buck DAC dongle — it nails great sound, stays ultra-portable, and just works beautifully for daily listening.
The NK1 Ultra takes that same proven CX31993 foundation and cranks things up a notch: a beefier amp stage and refined technical chops make it the clear pick for enthusiasts who want to squeeze out every last drop of performance.
In short: go NK1 Max for killer value, or step up to the NK1 Ultra if pure performance is what you’re after.
NK1 Max Official Link: https://www.nicehck.com/products/nk1-max
NK1 Ultra Official Link: https://www.nicehck.com/products/nicehck-nk1-ultra-adapter-dongle
