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Friday, December 5, 2008

Neutral vs. Natural: A Thought.

The question of finding a 'neutral/natural' sounding IEM* usually comes up in many forums in regular interval (*this probably applies to all headphone as well). While the question might seems very easy to answer, I often find it to be anything but simple. Reason? I just can't agree that 'neutral' and 'natural' being used interchangeably to describe the same kind of sound - well, at least not in the IEM world. So what do 'neutral' and 'natural' mean to me and why do such similar terms affect your path on finding the right sound? These all go back to the root of headphone design and the fundamental of what makes headphone so different from loud speaker that most of us are more familiar with.

To understand this topic, you need to understand some essential differences between loud speaker and headphone. A reputable loud speaker manufacturer usually like to advertise their product for having a flat frequency response (FR). The important of having a flat FR is that it means the speaker won't add or subtract sound from the amplifier's signal. It will just sound as what it is intended to sound like. In the case of a non-flat FR, the speaker is said to 'color' the sound by increasing or decreasing the sound pressure level on certain region (i.e. extra bass or treble that is not supposed to be there). People who are into Hi-Fi usually like to avoid coloration as much as possible. After all, they want high fidelity, not high fiddle-ity. Here is where neutral meets natural: The speaker is said to be neutral (flat) sounding when there isn't any coloration (non-flat FR), which means it is also most truthful to the recording thus it is closest to what sounding natural. In the headphone world, however, neutral does not equal to natural. When you use speaker, the sound travels through the room, interacting with the wall, furnitures, your body, and your outer ears before reaching your eardrum. Every interaction during the process affects the final FR you hear, meaning it is not likely that the FR measured in your ear canal will be as flat as the FR of the speaker . If the FR is not longer flat, why do we called it natural sounding? That's because interaction is part of the natural process of how sound travels through space. When using headphone (especially IEM), many of those interaction do not take place. If headphone has a flat FR, you will probably hear a flat FR, which is not normally what you will hear when you are listening to speaker. To compensate, headphone manufacturers will tuned the FR of their headphone so it will better resemble the FR after the speaker's sound travels through the room. A common example will be the extra bass response most headphones have. lower bass note are often felt by the skin and heard by the ears at the same time, so the impression of hearing low bass note is a mixture of auditorial and tactile sensation. Since headphone transducer are much smaller (and move much less air), headphone user often 'not feeling' enough bass when the FR is flat. To compensate, headphone manufactures give their headphone an extra bass response so more air is moved and the user can better 'feel' the bass note as they would like when they are using speaker . This is why coloration is more favorable than being neutral (flat FR), thus coloration is what sounding more natural to the users, not flat, neutral FR.

So what kind of FR actually sounds more natural to an IEM user? There isn't a clear, straight answer I can give you. To add to the complex issue of what kind of tuning results in a more natural sound, we still have to consider the fact that each of us hears thing differently - we all have our very own FR curve due to aging and hearing damage accumulated over time. When you add the difference in musical taste to the big mix, there is impossible to tell what would sound most natural to you. However, there is one thing we can be sure of: Neutral and natural are not created equally in the IEM world.

Disclaimer: All trademarks and logos in the website belong to their respective owners. Beside getting free review samples, I don't work for or get paid by anyone to write anything on this website, or anywhere else in that matter. Also, free review samples are never sold for any financial gain. I do buy gears and review them, but for simplicity you (the reader) should always assume what I review is free sample in nature (and thus comes with all the bias). The website does have Google Ads and Amazon Associates enabled (which I have no direct control over their content) - though I don't write review for a living, nor does the ads generates enough money to cover my breakfast (in fact, not even one breakfast per week). Listening to music and playing with audio gears are purely hobby for me. In short, I am just an audiophiles who happens to have his own blog. Not a journalist who happens to be an audiophile. Oh, and excuse my writing as I am not a native English speaker and can't afford a proofreader. Also, just because I don't write in a negative tone doesn't mean I don't write down the negative aspect of a gear. Please read them carefully. Last but not least, please note that this site uses cookies to track visitors' number and page view.

Important: All postings are my own personal opinion only and should not be treated as absolute truth. I do get things wrong just like everyone else. Always do your own research!

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