TRN ST2 review

Feb. 27, 2022 Beware
image of trn
(OSP: £17) £12
AliExpress/TRN Store

Throughwork

TRN, founded in 2017?, broke away from a company with similar product, Knowledge Zenith, to make more accurate and progressive earphones. Their model names have have become confused as the models multiplied. This is the base model.

Contents

image of trn-st2

Build

Amusing fact—TRN don’t try with boxes, so the box you get here is as you get at £800. On to the stuff—the way the money is used is startling. The cable is silver, not soft, has no memory, and will tangle badly. There’s a little extra bulk on the cable to create an ear‐wrap. The plug is surprisingly easy to grip. The cable is detachable, uses a 2‐pin connector that may fit KZ products, but is not the same as the coax plug on other phones. The housings are ear‐shape moulds found on expensive earphones—ST2s are intended to wrap the cable round the ear. Sum the shape, wrap, and the mid‐insertion depth, ST2s hold is outstanding. The cable plugs are unclear which is left or right but, once plugged, there is no doubt. I’m not convinced of robustness. They’re averagely comfortable and, besides the wrap action, easy to use. Online reports say people love the sparkle and gleam, and the makers have worked on this—I like them but make them good only.

Sound

Volume is outstanding. Exaggerated at bass‐guitar level, for no good reason. Volume range is passable. Envelope is dull, lowband especially is damped. Behind that, all‐band precision is good. Timing can be outstanding, but where there’s lowband, it drags. Swells are a little compressed—the frequency range gets ST2s out of this, but then complex replay muddles in midband. Outstanding near electric bass. Frequency gets aggressive in massed mid‐strings. Muted and dull near mid‐horns. There’s a duff spot near upper horns—can be heard in cymbals. Outstanding for high strings. Very clean, no obvious resonance or echo. Outstanding high and lowband range. Detail is poor on lowband, outstanding in highband, but muted by the envelope… color is often good but veriable. Scale is passable, positions are outstandingly accurate.

Vocals could be outstanding, but high edges and lowband boom make them only passable. Outstanding for soundtracks, and good for orchestra, because of clarity, frequency range, and dragging out masses of precision, if a little muddled. But duff midband frequencies, unlatched lowband and dragging pace mean ST2s can be poor elsewhere.

Spec

mic available?yes
cable noisequiet
accessoriesTwo pairs silicone eartips. Velcro cable strap.
support

Assess

TRN say they tune for lowband. The build is all you could wish for, and designed and made for good sound. Outstanding precision and frequency range is brought down by damped envelopes, edgy spot frequencies, unjustified lowband lift and, when lowband is involved, plodding timing. Orchestral listeners get much more than from other earphones, but voices are unsure, and every other replay can muddle and jarr.

This earphone has two drivers, so extra frequency range. It has a balanced armature for the highband—fast but incoherent with the dynamic lowband driver. The crossover works good. The ST2s also have a fancy housing, so ought to seal more consistently. There’s only a few reviews of the ST2, and they say the ‘bass’ is good, but they shout. I say this earphone is outstandingly clear, but I can’t think anyone wants to listen to the bad things—unless you love the neat lowband and they sparkle so you don’t care.