This and That:
It's also available under the Pioneer brand as "SE-Cl331".
Solely four pairs of silicone tips are included. No case or pouch (which is still okay for the price - I've bought an extra case on AliExpress for less than $5 for my TE-02).
Is IPX5- and IPX7-certified, hence allegedly waterproof, hence the "WP" in the name.
Weird looking nozzle screen made of metal (probably contributes to the waterproofness).Good cable; slightly springy though.
Sound:
I'm only using the largest included silicone tips for listening.
Tonality:
The TE-02 is very neutral sounding; a very pleasant surprise for the moderate price.
The lows extend flat down to 20 Hz without any roll-off and are just very slightly (definitely less than 2.5 dB) more present than that of my Etymotic ER-4S/the ER4SR in the area between 20 and about 300 Hz; the mids are tonally mostly correct in my ears and are, just like the bass and lower fundamental range, very slightly more forward than strict neutrality at 1 kHz (by about 1 dB).
The presence range past 2 kHz is somewhat in the background. Level starts increasing again from 3 kHz on, with a small spike around 5 kHz respectively 7.3 kHz, however without crossing the base level here (the 5 kHz one is below the neutral line and the 7.3 kHz one just at neutral levels). Therefore as a result, the treble is generally a bit in the background/relaxed.
Extension above 10 kHz is good, although quieter than in the upper highs before 10 kHz.
As the lower treble/lower middle treble is a bit in the background, vocals lack exhaustion.
Although the Etymotic ER-4S sounds different (= more neutral, especially in the treble there the TE-02WP is more on the relaxed side, although with a bit of unevenness in the middle highs that's however only noticeable doing sine sweeps as its below-neutral in quantity; the only thing this mild unevenness in the central/upper central treble treble is adding a slight bit of tinny-ness to the highs, but that's the in-ear's only small flaw), the TE-02 shares similarities except for the more recessed lower /lower middle, wherefore it is (tonally) closer to my UERM (which mostly neutral sounding as well, however ultimately somewhat less than an ER-4S/ER4SR).
Heck, in terms of tuning realism and evenness, this inexpensive in-ear beats dynamic driver in-ears costing much, much more, such as the HiFiman RE800 (that has a strong, metallic upper treble spike) or Mee audio Pinnacle P1 (that has an uneven midrange and upper treble peak).
Resolution:
In short: clearly better than expected.
I'm no hypester but the TE-02WP is one of the few inexpensive in-ears in the lower two-digit price range that clearly punch above their weight. As such, its bass is very tight, quick and superbly controlled; not only for dynamic driver standards but even in general. Here, it beats most other dynamic driver in-ears as well as the comparably priced HiFiman RE400 that sounds softer and slower than the Fostex.
Speech intelligibility is fairly high, with good rendering of singers’ variations, however the somewhat recessed presence range and lower middle central make the detail level of the midrange appear somewhat more on the relaxed side. Midrange resolution is a bit behind that of good Balanced Armature in-ears.
Treble details and separation are clean and precise. The bass and highs never show real signs of strain even with demanding recordings.
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When it comes to neutral sounding dynamic driver in-ears, this inexpensive Fostex is the only (dynamic driver) in-ear one would ever need. With the right marketing and accessories, I could easily see it priced in the $200 range, as that's what the sound quality is definitely worth.
Soundstage:
The stage is a little wider and deeper than what I'd consider average (e.g. Etymotic ER-4S/ER4SR), although not much. It's mostly circular (actually slightly elliptical) though.
Instrument separation, placement and layering are, like the rest of the technical performance, is better than one would expect for the price. Yes, the soundstage and instrument separation appears precise.
It also doesn't collapse much when busy and fast tracks are being played but remains coherent and mostly controlled.
Conclusion:
An inexpensive single dynamic driver in-ear with a mostly neutral tuning with inoffensive highs, a fast and tight, well-controlled bass, precise note and instrument separation and authentic soundstage. No-brainer.