In-Ear Fidelity

ThieAudio Legacy 3 Review: The Other Perspective

Table of Contents


This is a continuation of my previous ThieAudio lineup review.

ThieAudio is Linsoul’s newest venture into OEM partnership market, beginning with the $350 Phantom planar headphone that had lukewarm reception but didn’t really take off in the grand scheme of things.

Recently, ThieAudio dipped their toes into the IEM market with two lineups: the Voyager lineup and the Legacy lineup. The Voyager lineup consists of IEMs with pure BA configurations (V3 and V14) while the Legacy lineup consists of IEMs with hybrids configurations (L3 and L9). 

Naturally, given that this is a new brand we’re talking about there’s really nothing much to introduce. Let’s get right to it.

Product page:

MSRP: $130

Driver configuration: 2BA 1DD hybrid

This Legacy 3 was kindly provided by Linsoul.

Signature & Tonality

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Comparison courtesy of the Graph Comparison Tool

As you can see from the measurements, the switch named simply as “1” does not do anything so I’m not sure why it exists in the first place. At any case, while flipping switch “2” on does make the L3s sound a little less V-shaped, it’s still very subtle and probably wouldn’t change your opinion of the L3 if you didn’t already like it with switch “2” off.

I would describe the L3’s signature as a mild V-shape, perhaps neutral with a small bass boost, or simply “balanced”. No frequency range particularly jumps out and so the L3 is a relatively inoffensive, safe tuning overall.

My only real gripe with the L3 is that it can sound a bit dull and bland, especially given its rolled-off treble response. A lot of instruments and vocals tend to lack the necessary bite and energy that I’ve gotten used to in “better tuned” sets, though is somewhat alleviated with the “2” switch turned off. The lack of upper-end airiness doesn’t help the L3 here, and so the L3 lacks quite a bit of overall clarity in its presentation.

With the amount of criticisms I’m dishing out you would think that I loathe the L3’s tonality, but not so. The L3 is actually a pretty well-tuned set of IEMs in the grand scheme of things, but it still isn’t (at least, in my opinion) TOTL-level. Just goes to show how much hype surrounds this IEM that despite being pretty decent on its own, I have to give a disclaimer that this $100 IEM isn’t going to fight with $2000 top-tier sets (IMO, audio is subjective, YMMV etc.).

Tone grade: B

For more information on the grading system, click here


… and here is where the L3 stumbles.

No sugarcoating, its overall resolution is certainly limited, to put it nicely. Notes aren’t presented quite as sharp or defined as high-end sets, and so detailing suffers as a results. That’s not to say that I’d describe the L3 as “dulled” or “fuzzy around the edges” like I would with other IEMs with below-average technicalities (like the more recent AQ3 that I’ve reviewed) but lets not kid ourselves; it’s no ER4.

Per usual, imaging capabilities are average which is par for course for an IEM. Not quite hearing the special sauce that others are raving about, especially in direct A/B comparisons with IEMs that I’ve considered as exceptional in this regard (i.e. IER-Z1R).

Technical grade: C+

For more information on the grading system, click here


Here, I’d have to remind everyone that the L3 is actually within perfectly acceptable parameters for a $100-ish set of IEMs, even exceeding the immediate compeition in certain aspects such as overall tonal balance. Even at its weakest point, its technicalities, it doesn’t perform particularly bad… just as expected for an IEM in its price range.

The L3 barely scrapes by with the “worth the price” status (by IEF standards), though it’s not in a strong position here given that (IMO) other $100 sets like the Tin HiFi T4 could trade blows with the L3 and come out on top. Not to mention abnormalities like the ER2… but we don’t talk about those. Out of fairness.

Is the L3 competitive? Sure, absolutely. But does it set higher expectations for what would be considered “good” for $100? Perhaps as a bare minimum, but not as the leader of the pack.

Value Rating: ★

“Worth the price”
For more information on the grading system, click here


The Legacy 3 is a competitive $130 IEM that presents a balanced tuning that’s relatively uncommon in its price bracket, though ultimately bottlenecked in terms of detail retrieval and overall technical ability.

Grade: C+

Awarded grades are in reference to the Ranking List.

Support me on Patreon to get access to tentative ranks, the exclusive “Clubhouse” Discord server and/or access to the Premium Graph Comparison Tool! My usual thanks to all my current supporters and shoutouts to my big money boys:

Man Ho

6 thoughts on “ThieAudio Legacy 3 Review: The Other Perspective”

  1. The L3 CIEM seems to fix the upper treble issues and any lower treble anomalies I’ve had. It actually makes the tonality quite good but still lacks bass resolution compared to higher end models. This is an iem I think sounds better at lower volumes.

  2. Good to see our thoughts line-up. It’s not a bad IEM, just leaves something to be desired technicality wise. My main concern right now is actually the unit variance, as there seems to be some good apples and some bad apples out there. Did you notice any timbre coloration too?

  3. Thanks for the review, I was hearing people claim that it was the best thing ever and wanted a critical review that tells it how it is.

  4. I own both the L3 and the L9 and… I took my time to listen to them carefully. Had some different opinions on the L9, but totally agree with your this time!

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