In-Ear MonitorOverreview

Moondrop Chu II DSP

Name: Moondrop Chu II DSP
Brand: Moondrop

The plain Chu II's metal earpieces on a USB-C cable with a mic and app EQ — praised as a no-dongle bargain, split on whether its trimmed default bass is cleaner or thinner, and dogged by cable faults and Samsung call trouble.

46 sourcesUpdated 2026-11-07

$24Typical US price

Score aggregates reviewer opinions across topics.

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The short version

What to know.

A single-dynamic-driver IEM with a zinc-alloy shell and a detachable USB-C cable holding a DAC, mic and app-set EQ, about $24. Most measurements put its likely default preset close to the Harman in-ear target through the bass, with less bass and upper midrange than the plain Chu II; an analog cable restores the plain tuning. Reviewers and owners broadly agree on value: as an all-in-one for a phone or laptop it is hard to beat for the money, though people who already own a dongle see less point in it. Most also find the treble smooth and the small shell comfortable, with some complaints about weight on longer wears. Bass is the main sonic split, with three near-equal readings: cleaner and better judged, too light, or soft and boomy. Mids split too: most hear clear vocals, others hear shouty upper mids or, less often, recessed vocals. Build splits most sharply: the metal shell is praised, but owners report buzzing and static, dead channels and cable failures, reliability is the most lopsided negative topic on Amazon, and calls can sound robotic or fail on some Samsung phones. Most who mention the app call it buggy, and the mic divides people.

About this product

The USB-C version of the Chu II, on sale since January 2024 and about $24 at most stores ($28 on Amazon). The earpieces are the plain Chu II's; the difference is the detachable cable, which carries a DAC, an in-line mic and remote, and an equaliser set from Moondrop's app, and whose default preset has its own tuning. Not the 3.5 mm Chu II (about $4 less, reviewed separately) or the Chu III.

Moondrop's Chu II DSP arrived in January 2024, six months after the $20 Chu II, and it is the same small zinc-alloy earpiece with the same 10 mm dynamic driver and brass nozzle. What changes is the cable: USB-C at one end, 2-pin at the other, with a DAC, an in-line mic and remote, and a five-band equaliser between them. For about $4 more than the analog set, it removes the need for a dongle on a phone or laptop without a headphone jack.

The cable also changes the sound. Most measurement rigs that hold it show less bass and less upper midrange than the plain Chu II, and a reviewer who measured both presets found the default closer to the Harman target; plug in an analog cable and the difference goes away. That one change feeds the main sonic argument, while most of the complaints gather around the cable itself: noise, dead channels, the app, and voice calls on some Samsung phones.

A good fit for

A first IEM for a phone or laptop with no headphone jack, without buying a separate dongle.
Listeners who found the plain Chu II a little bassy or shouty and want something closer to Harman.
Tinkerers on Android or desktop who will set their own EQ.
Small ears: the shell is among the smallest around.

Think twice if

You own a dongle or desktop amp already: the plain Chu II has the same earpieces for about $4 less.
You make calls on a Samsung phone: check your model first, as many owners report robotic audio or failed calls.
You want a dependable mic, or a polished iPhone app.
You want strong bass out of the box, since the default preset trims it and the EQ's positive gain is limited.
You live somewhere humid, or dislike upkeep: the brass nozzle tarnishes and its filters can clog.

The reviewer consensus

Agreement &
disagreement.

4 / 12topics divide opinion

6 Mostly agree4 Divided opinions2 Limited evidence

Common ground5

As an all-in-one for a phone or laptop without a headphone jack, the price is very hard to argue with.
Same earpieces as the plain Chu II: on an analog cable, the two versions sound the same.
The treble is mostly smooth and rarely sibilant.
The small metal shell fits most ears, though some notice its weight over long sessions.
Moondrop's app is the weak part of the software: most who mention it call it buggy or limited.

Points of contention5

Bass: cleaner and better judged than the plain Chu II, too light, or soft and boomy — three camps of nearly equal weight.
Durability: a solid metal set for most reviewers, against a long run of owner reports of noise, dead channels and failed cables.
Vocals: clear and well placed for most, shouty or recessed for others.
The mic: 'terrible' to some owners, 'very good' to others, and on some Samsung phones calls don't work properly at all.
Whether the default preset really differs from the plain set: most rigs and two reviewers say yes, one reviewer and three files say no.

A closer listen.

12 topics · 4 divided

Left: criticalRight: positiveTighter lines: more agreementDashed: limited evidence

Choose a topic

Build

Leans criticalDivided opinions

Reviewer sentiment18 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

The split is between the earpiece and the cable. The metal shell draws praise well above its price. The USB-C cable draws most of the complaints: buzzing or static, one side going dead, failures within weeks or months, and a connector some owners say gets hot. Separately, calls can sound robotic or fail outright on a number of Samsung phones, and several owners report Moondrop or the store replacing units. The brass nozzle also tarnishes and its filters clog, as on the plain set. Long-term owners dominate the negative camp, and some report no trouble at all.

Measured

On Amazon's topic counts, reliability is by far the most negative (9 positive / 43 negative mentions), against value at 53 / 13 and sound at 72 / 35. A keyword tally of 160 low-star Headphone Zone reviews finds dead channels or units in 31, calls, robot voice or mic in 20, and noise or static in 18. One ASR member relays Moondrop's reply on calls as 'this is a Samsung mobile phone compatibility problem'; another reports an S25 Ultra working. Linsoul lists the cable's warranty as three months.

Where it splits

Solid for the money — the metal earpieces are the main draw and hold up in daily use.40%

“Top marks for the build quality.”
Sunil Arkt (video)

The cable is the weak point — it feels cheap, and owners report noise, dead channels, Samsung call faults and early failures.60%

“So while the cable is ‘fine’ it is very cheap and tangles incredible easily.”
Jeromeof, Audio Science Review

Link to this topic

Bass

Leans criticalDivided opinions

Reviewer sentiment11 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Three near-equal readings of the same trimmed low end. Some hear a cleaner, better-judged bass than the plain Chu II's. Others find it too light, especially coming from consumer earbuds or for bass-heavy music, and this is a repeat theme in low-star owner reviews. A third group's complaint is quality rather than quantity: soft, loose or boomy, whichever preset is used.

Measured

On six squig.link rigs the set sits 2.7–3.9 dB below the plain Chu II on the same rig at 100–300 Hz, and within −0.2 to −1.4 dB of the Harman IE 2019 target there; 20–60 Hz runs −1.0 to −4.7 dB below target. Against the Chu III on two rigs it has 3.4–3.6 dB less at 100–300 Hz. Three other files (ATechReviews, MMagTech, Aftersound's 'cable' trace) sit within about 0.6 dB of the plain set here, and +2.2 to +2.5 dB over Harman.

vs. listeners — Most of the 'it's the same as the plain Chu II' claims and most of the 'it has less bass' claims can both be true, because the graphs fall into two groups: one consistent with the default preset, and one matching the plain set. Jay Audio hears and graphs no real difference; Enthusiast Impressions hears more bass from the USB cable on Samsung devices, the opposite of what most rigs show.

Where it splits

Cleaner and better judged — enough bass, with less midbass than the plain Chu II.37%

“The DSP tuning on the other hand tames down the midbase by quite a bit and also tames the upper mid-range slightly as well.”
Hangout.Audio (video)

Too light — not enough bass out of the box, particularly next to the 3.5 mm version.32%

“Brilliant highs and mids, though the bass is a little low.”
Akshaj Agarwal, Headphone Zone owner review

Soft or loose — the complaint is texture and impact more than quantity.31%

“slightly warm leaning overall on the softer side when it comes to the tactility”
Jay Audio (video)

Link to this topic

The hardware

Specifications.

Checked 2026-11-07

Design

Type: In-ear monitor
Drivers: 1 × 10 mm dynamic (aluminum-magnesium alloy composite diaphragm)
Housing: ZN alloy
Microphone: Inline

Electrical

Impedance: 18 Ω
Sensitivity: 119 dB/V≈ 101.6 dB/mW
Frequency response: 15 Hz – 38 kHz

Connection

Cable: Detachable
Connector: 0.78 mm 2-pin
Plugs supplied: USB-C (DAC in plug)

Manufacturer-published figures, not measurements · from linsoul.com, hifigo.com.

Follow the evidence

Sources 46

Read with context

Limitations & method.

As of 2026-11-07

What to keep in mind 6

This is a read of where reviews, owners and measurements land as of November 2026, nearly three years after launch. The under-$30 USB-C field keeps moving, and the Tanchjim Bunny DSP and Moondrop's own Chu III are the comparisons people raise most.
Graphs fall into two groups, and they rarely say which preset or cable was in use. Treat 'the default preset' as the best reading of the evidence rather than a label printed on each measurement.
Your phone or laptop matters more than usual here, because the DAC is in the cable. Samsung owners report the most trouble, but it varies by model, and one owner reports it working with a Galaxy S25 Ultra.
Star ratings skew positive because they mostly come from people who chose to buy it: 4.2/5 from about 2,600 Headphone Zone reviews, a store that invites its buyers to review, and 4.0/5 from about 1,150 Amazon ratings. The written fault reports are worth reading alongside the averages.
Few established publications have reviewed this USB-C version. Most of the opinion here comes from measurement hobbyists, video reviewers, forum members and owners, and Indian buyers are heavily represented among the owner reviews.
Impressions vary with fit and tips, and with whichever EQ people have set. The plain 3.5 mm Chu II has its own review, and impressions of it aren't mixed in here.

Where to buy Product & retailer links

Moondrop Chu II DSP Amazon

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Moondrop Chu II DSP

How the score adds up

What to know.

A good fit for

Think twice if

Agreement &
disagreement.

Common ground5

Points of contention5

A closer listen.

Build

Measured

Bass

Measured

Mids

Measured

Tonality

Measured

Treble

Measured

Soundstage

Imaging

Detail

Dynamics

Comfort

Isolation

Value

Specifications.

Design

Electrical

Connection

Sources 46

Limitations & method.

What to keep in mind 6