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AUDIOCULAR Note-S Type-C to 3.5mm Portable DAC & Amp
Upgrade your wired audio setup with the AUDIOCULAR Note-S, a compact USB Type-C to 3.5mm portable DAC and headphone amplifier designed for high-resolution audio and powerful portable performance.
At its core, Note-S combines the KT0231H USB Audio DAC with a dedicated MAX97220 Class-G headphone amplifier, giving you substantially more amplification capability than a typical USB-C audio adapter. It supports PCM audio up to 384kHz/32-bit and can deliver up to 125mW per channel at 32Ω, making it suitable for a wide range of IEMs, wired earphones and compatible headphones.
But Note-S isn't just about output power. Its differential DAC-to-amplifier architecture, low-noise performance and advanced My Audiocular software support give you greater control over how your music sounds.
What makes the AUDIOCULAR Note-S different?
Unlike basic USB-C to 3.5mm dongles that primarily provide digital-to-analog conversion, Note-S combines a high-resolution USB DAC and dedicated Class-G headphone amplifier in a compact portable design.
The KT0231H DAC supports up to 384kHz/32-bit PCM, while its differential DAC output connects directly to the fully differential input of the MAX97220 amplifier. This creates a streamlined signal path designed for clean and controlled audio reproduction.
The MAX97220 can provide up to 125mW/channel into 32Ω with a 5V supply, giving your headphones and IEMs greater driving capability from a pocket-sized DAC amp.
High-Resolution 384kHz/32-Bit USB DAC
The KT0231H USB audio DAC supports stereo PCM playback up to 384kHz/32-bit, allowing Note-S to handle high-resolution audio from compatible smartphones, tablets, laptops and computers.
Whether you're listening to music, watching movies, gaming or simply replacing your device's built-in headphone output, Note-S provides a dedicated wired audio interface between your USB-C device and 3.5mm headphones or IEMs.
The DAC offers up to 103dB SNR, helping maintain a clean audio signal during playback.
Dedicated MAX97220 Class-G Headphone Amplifier
A key feature of Note-S is its dedicated MAX97220 Class-G headphone amplifier.
Rather than relying entirely on the USB codec's built-in output stage, Note-S uses a separate headphone amplifier designed to provide higher output capability.
It can deliver:
- Up to 125mW per channel at 32Ω
- 112.5dB amplifier SNR
- As low as 0.0021% THD+N
- Capacitor-less output architecture
- Click/pop suppression
This makes Note-S a particularly capable option for users looking for a portable Type-C DAC amp with more power than a basic dongle DAC.
Differential Audio Architecture for a Clean Signal Path
The KT0231H uses a differential DAC output, which connects directly to the fully differential input of the MAX97220 amplifier.
This architecture is designed to maintain an efficient signal path between the DAC and headphone amplifier.
With 103dB DAC SNR and up to 112.5dB amplifier SNR, Note-S is engineered for clean, detailed and controlled wired audio reproduction.
Personalise Your Sound with My Audiocular
Want to change the sound to match your headphones, IEMs or personal preference?
Note-S works with My Audiocular, giving you access to a range of sound-customisation tools through the supported web app and Android app.
You can access:
- 6-band EQ
- Multi-band PEQ Editor
- Auto PEQ
- Adaptive Sound Test
- AI-powered sound recommendations
- Device Dashboard
- Custom sound presets
This makes Note-S more than a conventional USB DAC dongle. You can fine-tune your listening experience instead of being limited to the manufacturer's default sound.
USB Audio Class 1.0 & 2.0 Support
Note-S supports both USB Audio Class 1.0 and USB Audio Class 2.0, providing compatibility with a broad range of supported USB-C devices.
Connect it to a compatible:
- Android smartphone
- Tablet
- Laptop
- Desktop computer
- Other USB-C audio source
Then plug your existing 3.5mm IEMs, earphones or compatible headphones into the Note-S and you're ready to listen.
Because Note-S is powered directly through USB-C, there is no separate battery to charge.
Compact DAC Amp for Everyday Wired Listening
The biggest advantage of Note-S is how much functionality it packs into a small portable device.
You get a 384kHz/32-bit USB DAC, dedicated Class-G headphone amplifier, up to 125mW/channel output, EQ and PEQ support, AI sound features and 3.5mm connectivity without carrying a separate desktop amplifier or DAC.
Keep it connected to your laptop at your desk or pair it with your USB-C smartphone for portable listening.
Who is the AUDIOCULAR Note-S for?
Choose Note-S if you want:
- A Type-C to 3.5mm DAC and headphone amplifier
- High-resolution 384kHz/32-bit PCM support
- More output power than a basic USB-C audio adapter
- Up to 125mW/channel at 32Ω
- A dedicated MAX97220 Class-G amplifier
- Built-in sound customisation through EQ and PEQ
- AI-powered sound recommendations
- A compact solution for IEMs, earphones and headphones
- USB Audio Class 1.0 and 2.0 support
- A USB-powered DAC amp with no battery to charge
If you simply need basic USB-C to 3.5mm conversion, a simpler dongle may be sufficient. If you want higher output capability and extensive sound customisation in a compact DAC amp, Note-S adds considerably more functionality.
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I listen to rap , phonks , metal , jaz n this iem is perfect for it for around 2.5k bass is there but it doesn't feel too much or too less like in my case excessive base hurts my ears but it's perfect in this one imo, they are small n light so they feel very comfy n sound is awesome pair it with a dac n it gets even better
I would def recommend it to everyone
This IEMs are genuinely impressive, especially for their price range of around ₹5k. They offer a well-balanced and enjoyable sound signature that works really well across a wide variety of music genres.
The overall sound is detailed without being overly aggressive, making them easy to listen to for longer sessions. For the price, the tuning and overall audio experience are really hard to complain about.
This was my first iem and instrument separation is top notch and bass is good
Excellent fit to my 7.1 HomeTheater system.
The Subwoofer is right sized for my media room and offers excellent clarity to Bass notes..
I bought it mainly to use with my IEMs and it actually made a noticeable difference. The sound feels cleaner and has more power compared to my phone’s normal output.
The 7Hz Zero 2 is an absolutely fantastic IEM for the price. The sound is clean, detailed, and well balanced, with punchy bass, clear vocals, and smooth treble. It's my first IEM and i am loving it.
Nice pair of iem’s. A true upgrade for me from 7hz salnotes zero (the OG) Got delivered safely and on time.
Really Recommended as one of the Best DACs. You can also this DAC during Online Calls and Meetings for both on Laptop and Smartphone
One of the Best IEMs with Crisp and Clear Vocals with a Solid Premium Designs
The AUDIOCULAR SPARK Hi-Res Portable DAC Dongle with CX31993 DAC and MAX Amp is a very impressive option for anyone looking to take their mobile audio experience to the next level. Despite its small and portable form factor, it delivers a significant improvement in sound quality compared with the standard audio output found on many smartphones, laptops, and other devices.
The first thing I noticed was the overall improvement in clarity and detail. Music sounds cleaner and more open, with better separation between vocals and instruments. Vocals have a good amount of presence and sound natural, while instruments are easier to distinguish, especially when listening to well-recorded tracks. The bass has good punch and control without overpowering the mids, and the treble provides a nice level of detail without becoming excessively sharp.
The CX31993 DAC does a great job of providing a clean
I’ve been using the AUDIOCULAR D07 CX31993 USB DAC & Amp for a while, and overall I’m quite impressed with what it offers for its size and price. The biggest advantage is its compact and slim design, which makes it very convenient to carry around and use with a laptop, PC, or compatible smartphone.
In terms of sound quality, the D07 provides a noticeable improvement over the built-in audio output of many laptops and phones. The sound feels cleaner and more detailed, with better clarity and separation between instruments. Vocals sound more natural, and there is a good amount of punch and control in the bass without making the overall sound too boomy. It also gives headphones and IEMs a little more power and makes music feel more engaging.
The CX31993-based DAC does a good job of delivering clean audio, and I particularly appreciate the plug-and-play functionality. There’s no complicated setup or additional software required in most cases, which makes it very easy to use. The small form factor is another major plus, especially if you want something portable rather than a bulky desktop DAC/amp.
For casual listening, streaming, gaming, and watching movies, it performs very well. Of course, it shouldn’t be compared with much more expensive dedicated DAC/amp systems, but within its price range, it offers an impressive combination of sound quality, portability, and convenience.
Overall, the AUDIOCULAR D07 CX31993 is a solid choice for anyone looking for an affordable USB DAC & Amp to improve their everyday listening experience. It’s compact, easy to use, and delivers clean and enjoyable sound. Definitely a worthwhile upgrade if you’re currently relying on basic built-in audio.
It one of the best purchases till now
All rounder
Best iem under 10k
Beautiful design
Solid built quality
Good quality cabels
Loved it
It's actually good piece and getting better sound clarity but not must satisfied with bass even though I bought improved bass version
