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Technical TermsDescriptionAcoustic Purifier

Based on the same technology of the Spiral Dot ear tips, small dot profusions were added within the IEM nozzles. These bumps are designed to diffuse and disperse the sound more naturally and to reduce resonance and turbulence.

High Energy Magnetic Circuit

To improve “performance and reality” a dynamic high-energy magnetic circuit was developed which uses a new plate shape.

Quad Metal Harmonizer

Resonance is further addressed by a combination of different materials such as stainless-steel rings in the front and rear, a brass inner housing, and an aluminum cap.

Wooden Stabilizer

Designed to maximize clarity by controlling and suppressing the vibrations of the rear of the housing, a ‘wooden stabilizer’ made of laminated layers of wood was added to the internal structure of the IEMs.

The HA-FW01 are made of wood inside and out.

Why Would Wood Work Wonderfully?

According to the promotional material for the HA-FW01, JVC has much to say on the “Story of WOOD”.

“The sound propagation speed of wood is… especially fast along the direction of the fiber grain, and not so fast against the grain…

Taking advantage of the characteristics of wood, that it doesn’t easily generate standing waves, we were able to achieve natural sound reproduction that is less likely to generate unnecessary resonance.” – JVC

JVC found that the mass of the diaphragm needed to be lightened to improve the “expressiveness” of the sound (their word), so they developed a proprietary slicing machine to create wooden sheets that are only 50 microns thick (from a previous 80 microns).

This allowed them to create a new 11mm diameter 

wood

 dome diaphragm driver for the HA-FW01. The HA-FW02 and HA-FW03 both share a 10mm diaphragm.

“For the housing and wood stabilizer, a laminated layer made of thin slices of wood, layered one after another at offset angles and compressed, is used. This laminated layer uses wood that has been precisely processed in Japan to achieve better sound quality.

This is a characteristic of WOOD that no other earphones feature.” – JVC

Audio Quality

JVC claims that they had many serious discussions on what sound signature that they wanted for the HA-FW01. Accordingly, they undertook a passionate quest for developing IEMs with an original character, that convey “vibrant and easy-to-understand sounds”.

“The sound of the HA-FW01 has a thick tone in the mid-low range and a dynamic tone and scale over the entire range… the low-range power is also attractive because the audio deviation values, such as resolution, texture, and musical expression, are high.” – JVC

Previous JVC woodie models had reported issues with excessive upper bass bleeding into the midrange, causing a somewhat muffled sound quality. The focus on resonance control with the HA-FW01 is likely in response to these concerns, in an effort to boost clarity and detail.

I’m happy to report that I hear no lack of texture or intelligibility. The thinner diaphragm also likely leads to improved reproduction speed and transients. The dynamics of the HA-FW01 are truly impressive.

JVC even makes recommendations as to what they would like you to listen to with the HA-FW01.

“Although it is a model that is highly compatible with various music genres, we want you to experience large ensembles such as an orchestra in order to feel the size of the soundstage and the three-dimensional sound field. I am confident that you will appreciate its superb sound quality.” – JVC

The combination of low impedance and high sensitivity means that the HA-FW01 can be easily driven directly from any source (such as a phone) although its impressive detail retrieval means it benefits from more resolving sources.

Frequency response graph for the HA-FW01. (From: reference-audio-analyzer.pro).

Bass

It should come as no surprise that these IEMs have stand-out bass performance. Certainly, audio appears very large in presence, yet they are able to retain excellent detail and timbre. When the music calls for it, they hit quite hard.

If you are looking for a purely balanced sound, look elsewhere, because the HA-FW01 have a fun, warm, and rich sounding presence. They feel big and wide, more timpani than snare drum.

Midrange

The midrange is no shirking violet either. It’s quite forward in the mix, but does retain decent naturalness. Voices and guitars are reproduced deeply and with ample detail. Depending on the track, however, things can tend towards a bit of grainy harshness and congestion. If the music’s midrange is very busy and boosted, this comes through in the HA-FW01.

I’m (of course) looking for flaws and for the majority of my listening, things sounded great. It’s perhaps an unwanted consequence of outstanding detail presentation. If the track has grain, the HA-FW01 doesn’t hide it. My overall impression is one of realism and extraordinary retrieval.

Treble

Treble extension is quite generous, imbuing the music with a feeling of sparkle but with minimal sibilance and without excessive brightness. Clarity and detail continue to be very good all the way through the higher registers.

The HA-FW01 deliver impressive impact while maintaining great separation and layers within the music. They provide a balance of dynamics and transparency that envelops the listener. If you like to get lost within, and to really feel the power and presence that great music can provide, it’s well worth a listen to these IEMs.

Maybe it’s simply a case of psychoacoustics, but the word that I’ve struggled not to use to describe the sound of these wooden wonders is ‘organic’. Suffice to say the HA-FW01 cannot be described as sterile or clinical sounding. They bring a power and presence to the music that is compelling and encompassing.

Conclusion

Back to my luxury car analogy.

Open the bank-vault-like door of a Bentely and gaze upon the luxurious interior. Sink into the lushly stuffed, buttery soft leather seat and grasp the ornate steering wheel. It responds to your touch with the solid feeling of granite warmed in the midday-sun.

Or for quite a few less shekels, experience luxury at a much smaller scale. JVC offers audiophile jewelry that slips comfortably into your ears and allows you to lose yourself in warm organic power, delivered with aplomb.

Dear readers, as you may have suspected… no, I’ve never been in a Bentley. I’m taking creative license to wax poetic.

Sure, there are plenty of (much) more expensive IEMs currently available. They boast scalpel-like precision and amazing stats. But they seem so sterile. So cold. The HA-FW01 is no stripped-down supercar and is the better for it.

The JVC HA-FW01 IEMs are a premium product in a world of bang-for-the-buck competition.

There seems to be something about these IEMs that brings out the inner poet. Certainly, JVC was inspired to reach for words and phrases to inspire awe.

“The hidden force of the tree, I want to tell Overwhelming reality as possible to draw even to the air a sense of the place where delicate sound weave… enables the representation of the delicate nuances of high-resolution sound… adopted the new development “acoustic Purifying Fire”.” – JVC