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TRUTHEAR Zero:BLUE21 / 6
In their words

@maroon_glacier_76 · Owner-reported

Owned under a month · Still using it: no, stopped · Posted

The nozzle is realy big in diameter, i dont enjoy wearing these for longer than maybe an hour Max. The sound is too Boomy in the bass and also very Icepicky for me. i had to use heavy EQ to smooth it out on bass and treble. actualy hurts to wear them for me. The quality is Good.

  • Comfort · worse than expected
Would not buy again

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TRUTHEAR

TRUTHEAR Zero:BLUE2

Current price · Amazon US
$64.99
Check Price on Amazon

Price last checked 2d ago

Owners (1)
0of 1
Buy againOwner reported

Would not buy it again; has stopped using it.

Owned under a month.

  • Fit and comfort over hours1 worse
  • Shells and connectors after months1 as expected

Key specs

Connection Type
Wired-3.5mmMost common
Wired-3.5mm95%Bluetooth5%

Wired-3.5mm is the most common — on 95% of the 38 in-ear monitors we've cataloged (of 39).

Has Microphone
Yes
False69%True31%

True appears on 31% of the 35 in-ear monitors we've cataloged (of 39).

Driver Size
10, 7.8 mmAbove average
10 mm
7 mm13 mm

above average for in-ear monitors — based on 23 of 39 we've cataloged.

Connectivity

Connection Type
Wired-3.5mm
Cable Type
2-pin detachable

Microphone

Has Microphone
Yes

Sound

Driver Size
10, 7.8 mm
Driver Count
2
Driver Type
Dynamic
Frequency Response
20-41000 Hz
Frequency Response High Hz
41000 Hz
Frequency Response Low Hz
20 Hz
Impedance
5.8 Ω
Sensitivity
119.5 dB/mW

Design

Color Options
Blue
Earbud Form Factor
In-ear
Detachable Cable
Yes

Features

Inline Controls
Yes

Identity

Model Number
ZERO:BLUE2

Release

Msrp Usd
64.99 USD

Objective measurements from the SoundGuys test lab — overlay other models to see how this one compares.

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TRUTHEAR Zero:BLUE2SoundGuys Headphone Preference Curve
Measured frequency response (dB relative) against the SoundGuys Headphone Preference Curve. When the measurement goes above the dashed line, that frequency is louder than our preference curve, and when it goes below: it's quieter. Use the curve for comparison purposes only, as your taste may vary.-20-100+10+20201001k10k20k

Measured frequency response (dB relative) against the SoundGuys Headphone Preference Curve. When the measurement goes above the dashed line, that frequency is louder than our preference curve, and when it goes below: it's quieter. Use the curve for comparison purposes only, as your taste may vary.

TRUTHEAR Zero:BLUE2: frequency response, as measured in the SoundGuys lab. Frequency in hertz.
Frequency (Hz)Response (dB)
2019.4
2518.9
3218.1
4017.1
5015.7
6313.9
8011.7
1008.9
1255.8
1602.9
2002.1
2500.5
315-0.7
400-2.0
500-2.9
630-1.7
800-1.1
10000.1
12502.0
16003.1
20004.1
25006.1
31508.0
40008.1
50006.6
63004.7
80004.6
10000-3.2
125002.8
160004.1
20000-15.0

SoundGuys review

SOUNDGUYS rating
6.7/ 10
Worth a look
Jhaycee Calvez
Reviewed byJhaycee CalvezVideo Producer/WriterReviewed June 2025
Isolation6.5
Comfort & fit4.0
Design7.5
Portability8.0
Value6.5

The verdict

Great for gaming, but only for those looking at a bass-rumbling casual action gaming experience. For music listeners, the bass may be too much even for some bass heads. For those who want the bass to take center stage, this IEM is for you.

✓Liked: Bass heavy, Spatial width and depth, Flashy design, Separate cable with inline mic

✕Could be better: Fatiguing bass to some, Annoying to wear for long hours

Read the full SoundGuys review →

What a reader who owns the TRUTHEAR Zero:BLUE2 reports after living with it. Owner-reported, checked before publishing; ordered photo-verified first, then newest.

Owner notes are not paid for, not solicited from specific owners, and not edited by us. The commission SoundGuys may earn on this page comes from retail links, never from notes.

1 owner note

Every author writes under a generated pseudonym. A signed-in author’s email is never shown. Read more · The reader says they own it. We have not seen proof, and we say so — no label here is proof of a purchase. Read more · Owned under a month · Still using it: no, stopped · Posted

Would not buy again

The nozzle is realy big in diameter, i dont enjoy wearing these for longer than maybe an hour Max. The sound is too Boomy in the bass and also very Icepicky for me. i had to use heavy EQ to smooth it out on bass and treble. actualy hurts to wear them for me. The quality is Good.

  • Comfort · worse than expected
  • Mic on calls · better than expected
Showing 1 of 1 note · sorted by newest

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