Moondrop May IEM Review: USB-C DSP Innovation at a Budget Price

Moondrop May has 5,000+ reviews on JD.com with a 4.2/5 rating at ¥199 ($28). Users appreciate the innovative USB-C DSP cable with built-in DAC that eliminates the need for a separate dongle, the balanced Moondrop tuning with good detail and natural timbre, and the simplified single-cable connection to modern smartphones. The main complaints are the bulky cable assembly that’s heavier than the IEMs themselves, and the DSP module being permanently attached to the cable (non-replaceable without replacing the whole cable). Conclusion: ✅ Worth Buying — the most convenient IEM for modern smartphones with excellent value for the complete DAC-cable-IEM package.

Introduction

Moondrop is one of the most respected names in the budget-to-midrange IEM world, and the May represents their most innovative product yet. Instead of a standard IEM with removable cable, the May includes a USB-C cable with an integrated DSP (Digital Signal Processing) chip that acts as a DAC/amplifier, allowing direct connection to smartphones with no extra dongle needed.

At ¥199 ($28), the May costs more than entry-level IEMs but includes the built-in DAC functionality. Based on 5,000+ JD reviews and audiophile community feedback, we evaluate whether the USB-C DSP approach is a genuine innovation or a gimmick.

Specifications

Feature	Moondrop May	Truthear Gate	FiiO FD11	7Hz Zero 2
Price (JD)	¥199 ($28)	¥99 ($14)	¥99 ($14)	¥89 ($12)
Driver	10mm dynamic	10mm dynamic	10mm DLC dynamic	10mm dynamic
Cable	USB-C with DSP (fixed)	Detachable 0.78mm 2-pin	Detachable 0.78mm 2-pin	Detachable QDC 2-pin
Built-in DAC	✅ AKM DAC + DSP	❌	❌	❌
Housing	Resin + metal faceplate	Resin	Zinc alloy	Resin
Impedance	14Ω	32Ω	24Ω	27Ω
Sensitivity	112dB	110dB	112dB	114dB
DSP Features	Moondrop Link app EQ	❌	❌	❌
Weight	18g total (cable heavy)	5g per side	8g per side	5g per side
JD Rating	4.2/5	4.1/5	4.4/5	4.5/5
JD Reviews	5,000+	5,000+	20,000+	10,000+

Design and Build Quality

The May consists of two parts: a resin IEM shell with metal faceplate and a USB-C cable with an integrated DSP module. The IEM shell itself is standard Moondrop quality — translucent resin with a matte metal faceplate in a pale blue color. The shell is lightweight and comfortable with a standard nozzle diameter.

The cable is where things get interesting. A rectangular DSP module sits near the USB-C connector, housing the DAC/amp chip. The cable from the module to the IEMs is standard silver-plated OFC. The cable from the USB-C connector to the DSP module is reinforced with braided nylon.

The cable assembly is heavy — the total weight is about 18g with the DSP module. This is significantly heavier than a standard IEM cable and the weight is concentrated near the connector rather than the IEMs themselves. The microphonics are also higher than traditional cables because of the rigid DSP module.

“The convenience of plugging directly into my phone without a dongle is fantastic. No extra dongle to lose, no extra cable to manage. The sound quality is excellent — the DSP tuning gives clean, detailed sound with good bass definition. The cable module is a bit bulky though — it pulls on the USB-C port when walking.” — JD.com user

Performance

The built-in AKM DAC in the DSP module delivers clean, detailed sound that bypasses the phone’s internal DAC completely. The result is consistent audio quality regardless of the source device. The DSP tuning provides a balanced Moondrop house sound — neutral with a slight warmth and excellent vocal clarity.

The bass is well-controlled with good extension and definition. Mids are the highlight — vocals are natural and present with the Moondrop warmth. Treble is detailed but smooth without sibilance. The overall tuning is similar to the Moondrop Chu 2 but with slightly better technical performance.

The Moondrop Link app allows DSP EQ adjustment, including various tuning presets that modify the DSP filters. This is a genuine advantage — you can get different sound signatures without buying multiple IEMs. The stock tuning is the “May Default” which is the best starting point.

“The May sounds fantastic with the default DSP tuning. Clean, detailed, and balanced. I tried the different DSP presets in the app — the bass boost preset is great for EDM without muddying the mids. The convenience of plugging into my phone directly is underrated. I sold my dongle after getting these.” — JD.com user

User Reviews by Theme

DSP Convenience

“No dongle needed is a huge quality-of-life improvement. I plug my May directly into my phone for listening. The sound quality is consistent — same from my Xiaomi 14, my laptop, and my PC. The DSP processing is always active and always sounds good.” — JD.com user

💡 Summary: The USB-C DSP integration eliminates the need for a separate dongle, simplifying mobile listening.

Cable Bulk and Weight

“The cable module is too heavy. When I walk with the phone in my pocket, the weight of the DSP module puts strain on the USB-C port. I’m worried about long-term damage. I use a right-angle USB-C adapter to reduce stress on the port.” — JD.com user

💡 Summary: Cable weight and bulk are the primary complaints, with the DSP module putting strain on phone USB-C ports.

App EQ and DSP Presets

“The Moondrop Link app is great. The different DSP presets change the sound noticeably — the ‘Moondrop Classic’ preset has more bass warmth, the ‘Reference’ preset is neutral. It’s like having multiple IEMs in one. The app is stable on Android, no issues.” — JD.com user

💡 Summary: DSP EQ presets via the app offer genuine tuning flexibility unavailable on standard IEMs.

Sound Quality

“The May has excellent detail for ¥199. The DSP DAC gives it a clean background that reveals details. The tuning is balanced and natural — typical Moondrop house sound. Not as resolving as my Simgot EW200 but more convenient and still very enjoyable.” — JD.com user

💡 Summary: Sound quality is competitive with wired IEMs at similar prices, with the advantage of integrated DAC processing.

Purchase Recommendations

✅ Worth Buying (¥199)

Best for smartphone listeners who want high-quality IEM audio without dongle hassle. The built-in DSP DAC, app EQ presets, and balanced Moondrop tuning make it a complete package. Perfect for iPhone users with USB-C, Android users, and laptop listeners who want a simple high-quality audio solution.

⚠️ Not for Cable Swappers or Desktop Listeners

If you like swapping cables or using balanced connections, the May’s fixed cable is a limitation. If you already have a good USB DAC/dongle, a standard IEM like the FiiO FD11 plus a separate dongle offers more flexibility at a similar total cost.

Pros & Cons

✅ Pros	❌ Cons
Built-in USB-C DSP DAC — no dongle needed	Cable assembly is heavy and bulky
Clean, detailed sound from AKM DAC	Cable strain on phone USB-C port
App DSP presets for tuning flexibility	Cable not detachable from DSP module
Balanced Moondrop tuning	More expensive than comparable IEMs
Consistent audio quality across devices	No 3.5mm or balanced output option
Good vocal clarity and natural timbre	Limited to 48kHz/24bit via USB-C

FAQ

Q: Does the Moondrop May work with iPhone (USB-C)? A: Yes, the USB-C cable works with iPhone 15 series and newer with USB-C. Earlier iPhones with Lightning need the Moondrop May Lightning cable (sold separately). The May is not compatible with 3.5mm headphone jacks — it requires USB-C for the DSP DAC to function.

Q: Can I replace the cable if it breaks? A: The DSP module and cable are a single assembly. If the cable fails, you need to buy a replacement cable from Moondrop (¥79-99). The IEM shells themselves use standard 0.78mm 2-pin connectors, so you could use them with any standard IEM cable — but you’d lose the DSP functionality.

Q: How does the May compare to the Moondrop Chu 2? A: The May sounds similar to the Chu 2 but with better technical performance thanks to the DSP DAC. The Chu 2 costs ¥69 and requires a separate dongle for phone use. The May at ¥199 includes the DAC cable. If you already have a good dongle, the Chu 2 + dongle is similar quality for less. If you want simplicity, the May wins.

Q: Is the DSP EQ adjustable? A: Yes, through the Moondrop Link app (Android and iOS). You can choose from several preset tuning profiles (Default, Bass Boost, Reference, Classic) plus a custom 10-band EQ. The DSP EQ is applied within the cable’s DAC chip and works with any source.

Q: Does the built-in DAC improve audio on a phone without a headphone jack? A: Yes, significantly. Most phones without headphone jacks use a low-quality internal DAC for their USB-C audio output. The May’s built-in AKM DAC bypasses the phone’s DAC entirely, providing cleaner, more detailed audio regardless of the phone model.