This and That:
Nice build quality and design (heavy shells made of seemingly clear-coated metal), just the accessories that one needs along with a storage pouch (a case would've been nicer but a pouch is better than nothing).
Bad remote control (too stiff accentuation point), cable lacks chin-slider.
Sound:
Largest included silicone tips, only DACs/DAPs/Amps with low output impedance.
The small vent in the front of the in-ear bodies influences the bass quantity (the lows increase quite heavily the more it is blocked), wherefore the impressions will differ from person to person, depending on how much that vent is blocked by their ears. In my case the vent remains mostly free.
Tonality:
Well-tuned. Overall on the darker, smoother side but natural and balanced sounding.
The bass is only slightly elevated by maybe about 4 dB in my ears. That gentle emphasis focuses mainly on the upper bass, but also somewhat includes the upper mid-bass and lower fundamentals, giving the lows a warm-ish tint. Down from the midbass, level decreases, but the A65 is able to produce the sub-bass at decent levels. There's even a heavy sub-bass emphasis if the front vent is blocked.
From the upper bass on, the level in the fundamental range area is fairly even and nearing neutral and smoothly transits into the midrange that is quite spot-on with upper mids being just slightly on the darker, gentler side. Pleasantly, the A65’s lower treble/presence area is not really pushed back and is not under-present wherefore the mids are on the gentler side but not lacking any presence/glare, but as the upper mids are also not emphasised, their timbre is nicely natural and without unnecessary brightness.
The following treble is a gentle bit more in the background, but doesn’t make the sound appear lacking or dark. The entire treble is very even as well as smooth and I can’t spot any dips or peaks except for a small, rather wide "peak" at 8.5 kHz which is however quite subtle and below neutral in quantity wherefore you're not getting any sharpness or accentuated brightness but instead slightly inoffensive cymbals.
Level is a bit more in the background in the super-treble above 10 kHz, but doesn’t really decrease from then on and still maintains a constant level up to the extremely high frequencies.
So yeah, an in-ear that is on the smoother, natural and slightly darker side of neutral. Or a bass monster if the vent is blocked.
Resolution:
Really good performance for the price of ~$60-50, and exceptionally good for those who are lucky to score the A65 on sale for $20-ish.
Control and precision are really high for a dynamic driver in-ear and the lows are especially noteworthy as they are fairly fast, responsive and tight with good control and no softening towards the sub-bass. Body isn't fully absent though and the bass is just yet "bouncy" enough to make it more "lively"/give it a little more tactility. As such, it's a good deal better controlled, faster and tighter than most other dynamic driver in-ears' bass responses and only a tad softer than really tight dynamic driver implementations (iBasso IT01, Fostex TE-02, DUNU's Titan models).
The mids are clean and detailed; voices sound natural and finely resolved, and speech intelligibility is high.
At first glance, treble might appear to be a smidgen less detailed, but it really isn’t. As it is very even, smooth and slightly in the background, it does not grab one’s attention first, but it is clean as well as precise, however cymbals’ decay is perhaps a bit too fast and lacks some ringing/decay time.
The value that is offered here is quite remarkable and the Fidue even maintains good control with fast and complex music, which is something not really many dynamic driver in-ears in this price range achieve that well.
As a result of the even, smooth and natural tuning and great driver control, it is an in-ear that I really like for recreational listening, and one of the few dynamic driver in-ears that I really like or even love.
Soundstage:
To my ears, the A65's soundstage is small to at best average in terms of width, with more or less the same amount of spatial depth (maybe a little more than that).
While it isn't large to begin with, instrument separation and layering are enormously precise, and single instruments as well as sound elements are sharply and cleanly separated from each other.
Honestly, this is clearly more than one could expect in terms of separation and spatial precision from a soundstage out of an IEM in this price range. Quality over quantity is what the A65 delivers when it comes to spatiality.
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Vs. DUNU Titan 1:
Both IEMs have got titanium-coated drivers, but follow a different tonality and also differ in terms of soundstage presentation.
The Fidue is the more natural, smoother sounding out of the two earphones. Regarding resolution, both are not really far apart, though I would probably say that the DUNU has got the slightly higher amount of details. I the midrange, I see the Fidue as gently higher resolving and also in general as being more natural sounding.
The DUNU is a bit faster in the bass department where it has also got the better control at the same time.
The DUNU’s soundstage is clearly laterally as well as spatially larger extending (which could also be expected beforehand due to the semi-open design), but the Fidue’s instrument separation and spatial precision is at least just as good.
Conclusion:
People who are looking for a balanced, smooth, natural and slightly dark sound presentation with great driver control and high precision are spot-on with Fidue's A65 (as long as its front vents aren't covered - if they are, the in-ear becomes a sub-bass-heavy bass machine). The premium appearing shells made of metal are the cherry on top.