JLab Fit Sport 3 Wired vs TRN CS3: which should you buy?

On aggregated review scores the JLab Fit Sport 3 Wired comes out ahead with a HearWiki score of 71. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: JLab Fit Sport 3 Wired - Good overall at around $10.

Wired IEMs

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

JLab Fit Sport 3 Wired leads on 5 of 6 measures.

JLab Fit Sport 3 Wired
TRN CS3

HearWiki score

Sound

6.5

4.7

Battery

6.0

Calls

5.5

Value

8.0

Price (USD)

$10

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

These are the same generation of hardware - nothing in the radio, the codecs or the noise cancelling separates them. Nothing separates them on convenience features either, so the choice comes down to tuning and price.

Fit Sport 3 WiredYear unknown
CS32021

Specifications

Fit Sport 3 WiredCS3

Type: Wired IEMs; Wired IEMs
Price (USD): $10; $5
HearWiki score: 71; 49
Released: -; 2021
Availability: Still sold new; Discontinued
Driver: 10 mm dynamic; 6 mm dynamic
Driver type: dynamic; dynamic
Driver size: 10 mm; 6 mm
Drivers per side: 1; 1
Frequency response: 20 Hz - 20 kHz; 20 Hz - 20 kHz
Impedance: 32 Ω; 18 Ω
Sensitivity: 110 dB/mW; 118 dB/mW
Bluetooth: 5.0; -
Codecs: SBC; -
Multipoint pairing: No; -
Battery life: 10 h; -
Wireless charging: No; -
Active noise cancelling: No; No
Weight: 15.5 g; 11 g
Water resistance: IP55; -
Detachable cable: -; No
USB-C: No; No
Connector: -; 3.5 mm
Microphones: 1; -

Specification comparison of JLab Fit Sport 3 Wired vs TRN CS3
Spec	JLab Fit Sport 3 Wired	TRN CS3
Type	Wired IEMs	Wired IEMs
Price (USD)	$10	$5
HearWiki score	71 / 100 Good	49 / 100 Weak
Released	-	2021
Audio
Driver	10 mm dynamic	6 mm dynamic
Driver type	dynamic	dynamic
Driver size	10 mm	6 mm
Drivers per side	1	1
Frequency response	20 Hz - 20 kHz	20 Hz - 20 kHz
Impedance	32 Ω	18 Ω
Sensitivity	110 dB/mW	118 dB/mW
Wireless
Bluetooth	5.0	-
Codecs	SBC	-
Multipoint pairing	No	-
Battery
Battery life	10 h	-
Wireless charging	No	-
Features
Active noise cancelling	No	No
Design
Weight	15.5 g	11 g
Water resistance	IP55	-
Detachable cable	-	No
USB-C	No	No
Connector	-	3.5 mm
Calls
Microphones	1	-

What reviewers said

JLab Fit Sport 3 Wired

The JLab Fit Sport 3 Wired earphones offer a budget-friendly option for workouts, with a focus on punchy bass and clear mids and highs. They are built for active use with an IP55 rating and a secure fit, though they lack advanced features like noise cancellation or high-quality codecs. Overall, they provide solid performance for the price, making them a practical choice for gym-goers.

Pro:Powerful bass response
Pro:Clear mids and highs
Pro:IP55 water and dust resistance

Con:No active noise cancellation
Con:Only supports SBC codec
Con:Wired design limits mobility

TRN CS3

The TRN CS3 is an ultra-affordable, lightweight wired IEM with a single 6mm dynamic driver that delivers a bass-forward, lively sound with a surprisingly wide soundstage for its tiny size. It's built for comfort and everyday use at a very low price, though its technical performance in clarity and detail is only moderate compared to pricier models. This makes it a solid choice for casual listeners after a fun, budget-friendly tune.

Pro:Very affordable price
Pro:Lightweight and comfortable fit
Pro:Wide soundstage for the size

Con:Moderate clarity and resolution
Con:Limited detail and layering
Con:Non-detachable cable

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

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New comparison JLab Fit Sport 3 Wired TRN CS3