Fostex doesn’t produce a ton of consumer headphones, but when it does, the brand delivers skillfully. With respect to their audiophile line, their sound signatures tend to be somewhat unique and memorable when compared to other headphones in the same class. So, what can we expect from their latest release, the TH-616, in terms of tuning and performance? And how distinct is its sound signature?

What’s in the Box

• TH-616 headphones

• Detachable 2-pin cable with 1/4 termination

• Leather pouch

• User guide

Look and Feel

In terms of visual appeal, I’m a big fan of all of Fostex’s wooden cans. Balancing a relatively light and compact build with the warm richness of the wooden ear cups, the TH-616 achieves a simple, yet sophisticated and inviting aesthetic. 

With respect to fit, I found the leather ear pads super soft and smooth, sufficiently covering the circumference of my ears with a forgiving clamping force. The headphones never felt heavy on the head, and I quickly forgot I was wearing them, which is always a good sign.

Design

The open-back TH-616 incorporates a 50mm Neodymium Magnet. With respect to its driver configuration, Fostex has aimed to minimize distortion while achieving a wide dynamic range. The brand has employed the BIODYNA diaphragm, utilizing bio-cellulose fibers to facilitate an intricate and nuanced sound.

The TH-616 is not difficult to drive. For this review, I paired these cans with the little Astell & Kern SR35, and I had plenty of headroom to spare.

Sound Impressions

Soundstage

While there may not be a ton of height to the stage, there’s a definite sense of depth that extends noticeably ahead of and behind the ear. And given the fantastic separation and incredibly precise imaging, the space is holographic and colorful. Still, if you’re looking for a stage that’s super expansive, this isn’t it. Rather, the TH-616 presents a natural and contained space that still makes you feel like you’re sitting in the center of a rich, 3-D soundscape.

Low-End

Starting at the very bottom, the sub-frequencies, while audible, aren’t visceral. And even as we creep up the low-end, the bass is somewhat moderate and uncolored. That said, I got sufficient punch when listening to pop mixes, though bass-heads would be left thirsting for much more. But the presentation focuses on being natural, fast and disciplined, injecting ample funk and energy into modern tracks. As for acoustic instruments in this range, string instruments are uncompromisingly transparent and realistic, revealing even the most subtle textures and timbral elements with remarkable detail.

Mids

The mids are probably the standout attribute in this sound signature. The low-mids, though clearly present and comprehensive, remain lean, while the upper mids shine slightly forward, creating a lively and luminous energy. Combining this characteristic with the transparent and tight profile, the result is a crisp, pristinely layered and radiant midrange. And while it may not be the most forgiving tuning, this mid-centric profile is certainly refreshing and addictive to listen to.

Highs

Surprisingly, the highs aren’t thin and bright. Instead, you’ll find an easy treble with a touch of richness in tone that extends to the highest frequencies. Vocals in this range sound velvety, revealing a mild sumptuousness, rather than a light buoyancy or airiness. That said, the treble never feels heavy, and its roundness perfectly complements the crisp and more lively midrange. And overall, if you have a low tolerance for high frequencies, you can feel safe that the high treble won’t fatigue the ears.

Summary

The TH-616 presents a flawlessly clean profile and a memorable tuning that is distinct from so many other headphones in this echelon. If you are particularly sensitive to lower treble frequencies, the mids might start to get a little tiring. But if you appreciate a vibrant and luminous midrange, there are few other headphones that deliver it this well. Add to that an uber-detailed, fast bass and easy highs, and you have a refreshing sound signature that becomes more compelling the longer you listen.

You can buy the Fostex TH-616 at Audio 46.