FAQ

What are Open-Style Earphones?
Open-style earphones are designed differently from traditional in-ear earphones. Instead of sealing the ear canal, they allow ambient sound to remain audible while listening.
They are developed to create a more natural listening experience, enabling users to hear both audio content and surrounding sounds simultaneously. As a result, they may be less suitable in extremely noisy environments.
Because the speakers are positioned outside the ear canal, open-style earphones are not constrained by the same structural limitations as in-ear designs. Sound is delivered through directional air conduction around the ear.
This design can offer a more comfortable listening experience for extended wear and allows users to remain aware of their surroundings, making it easier to interact with others during use.
Open-style earphones are also designed to create a spacious and immersive sound experience compared to traditional in-ear products.
What are In-Ear Earphones?
In-ear earphones are designed to fit inside the ear canal, creating a seal that helps reduce external noise.
However, this design may also result in:

- Limited space for internal components due to the size of the ear canal
- Reduced awareness of surrounding sounds
- Less convenience for social interaction while in use

Does sound leak?
Under normal usage conditions, with volume set at approximately 60–70%, sound leakage is minimal.
At higher volume levels (around 80–100%), some sound leakage may occur depending on the audio content. This is common across many types of headphones, though it may be slightly more noticeable in open-style designs.
How about the volume?
The NEBULA Series is tuned using optimized EQ curves based on extensive testing to provide a balanced listening experience for most users.
In extremely noisy environments, the perceived volume may feel lower due to surrounding noise, even though the actual output level remains unchanged.
Why does the volume feel different for different users?
Perceived volume can vary depending on:
- Individual hearing sensitivity
- Differences in audio content
- Device type (phone, system, player)
- Audio formats and output settings

Users can adjust volume settings on their devices to achieve a comfortable listening level.