Review: Lotoo LE-M1 in-ear headphones

Review: Lotoo LE-M1 Monitoring IEMs / Earphones, with a neutral sound, flat presentation, designed for music production, and sound effects design

Introduction: The world of high-quality headphones has long been dominated by manufacturers from Germany, Japan, and the USA. However, emerging companies from other parts of the world are making a significant impact on the international market with their commitment to producing top-notch audio products. Lotoo, hailing from China, is a prime example, and their LE-M1 in-ear headphones showcase their impressive capabilities.


Weight headphones 8.27 g, cable 9.95 g
Price €349.99

Transducer principle 10 mm dynamic driver Closed
design , in-ear
membranes Carbon nanotube composite
Magnets Neodymium (N52)
Frequency response 10 Hz – 40 kHz
Impedance 32 Ohm
Sensitivity 105 dB / mW (@1 kHz)
Connection cable 1.2 m cable
Plug 3 .5 mm gold-plated, angled
Adapter no
Special features CNC-milled aluminum housing, removable 2-pin audio cable

Rising Beyond Manufacturing Services:

China has evolved from being the “workbench of the world” to becoming a hub for innovative audio products. While some manufacturing services are still outsourced to China, the country now boasts its own high-quality audio developments. Lotoo, a private label under Beijing Infomedia Electronic Technology Co. Ltd., which happens to be China’s largest supplier of audio workstations and broadcast automation systems, has ventured into this territory. Their portfolio includes portable high-end audio players, mobile recorders, and compact DACs. The LE-M1 represents their inaugural foray into the headphone market.

The build quality of the Lotoo LE-M1 in-ear headphones is a notable feature that reflects the manufacturer’s commitment to producing high-end audio equipment. Here’s a detailed look at the build quality:

1. Premium Materials: Lotoo has chosen premium materials for the construction of the LE-M1. The earphone housings are CNC-milled from aluminum, which not only adds to the headphones’ durability but also gives them an elegant and robust feel. Aluminum is known for its lightweight yet sturdy properties, making it an excellent choice for headphone construction.

2. CNC Machining: The use of CNC (Computer Numerical Control) machining ensures precise and consistent manufacturing. This precision is crucial for achieving a high-quality finish and ensuring that all components fit together seamlessly.

3. Anodized Finish: The aluminum housings undergo a sandblasting and anodizing process. Sandblasting creates a smooth and even surface texture while anodizing adds a protective layer to the metal, making it resistant to scratches and corrosion. This process not only enhances the headphones’ visual appeal but also increases their lifespan.

4. Full-Metal Construction: The LE-M1’s full-metal construction contributes to their durability and robustness. Metal housings are less prone to damage from impacts or rough handling compared to plastic counterparts.

5. Cable Quality: While the build quality of the earphones themselves is impressive, some users have noted that the included cable appears thin in comparison. A sturdier cable could have complemented the overall build quality and improved the user experience.

6. Attention to Detail: Lotoo’s commitment to build quality extends to the smallest details. The housing design is carefully considered, with precision engineering evident in every aspect, from the fit of the ear tips to the placement of the drivers. The use of high-quality components, such as N52 neodymium magnets, further underscores the manufacturer’s dedication to crafting a premium product.

7. Resonance Chamber: The resonance chamber inside the earphone housing is brass-coated, which can influence the headphones’ sound characteristics. This attention to detail demonstrates Lotoo’s desire to optimize audio quality.

In summary, the Lotoo LE-M1 in-ear headphones exhibit exceptional build quality. The use of premium materials, CNC machining, anodized finishes, and a full-metal construction contribute to their robustness and visual appeal. While some users may prefer a more substantial cable, the overall craftsmanship and attention to detail make the LE-M1 a standout choice for audiophiles and professionals who prioritize build quality in their audio equipment.

Packaging and Initial Impressions:

The LE-M1 arrives in a notably oversized packaging, which, while subjective, may appear excessive for the compact contents. Inside, a cardboard box encases the earphones and a replaceable cable, both nestled within hard foam. Beneath this layer, additional contents rest in equally snug hard foam compartments: a sturdy transport case and a holder with silicone ear tips in three sizes (S/M/L). It’s worth noting that this package does not include an extra cable or a 6.35 mm jack adapter. The matte black full metal earphones convey a high-quality feel, although the accompanying cable appears remarkably thin. The product packaging prominently displays Chinese characters, reflective of Lotoo’s primary market, showcasing their global expansion.

Construction and Technology:

Lotoo’s LE-M1 defies the prevailing trend of wireless earbuds with active noise cancellation by embracing wired in-ears. Their choice aligns with the support for HiRes-certified LDAC codec in their portable high-end players, which can transmit music wirelessly at resolutions of up to 96 kHz/24 bit with minimal latency. However, to achieve the highest possible resolutions, wired connection remains essential. The LE-M1’s CNC-milled aluminum housing exudes a premium aura, while dynamic drivers with a 10-millimeter diameter and carbon nanotube composite membranes deliver an expansive frequency range from 10 Hz to 40 kHz. A brass-coated resonance chamber and N52 neodymium magnets complete the construction.

Practicality and Sound Quality:

Comfortable and secure, the LE-M1 provides excellent noise isolation, making it suitable for various listening environments. Its 120-centimeter cable is well-suited for connecting to mobile playback devices often carried in pockets while on the go. However, a longer cable and a 6.35 mm jack adapter would be beneficial for recording, studio work, and connecting to audio interfaces or mixing consoles. In terms of sound quality, the LE-M1 shines across different music genres. Its tonal neutrality, fine resolution, and impressive impulse response ensure authentic reproduction. Deep bass, clear treble, and powerful mids all contribute to its impressive performance. Whether it’s Daft Punk’s electronic beats, classical compositions, or classic rock anthems, the LE-M1 handles them with finesse.

Sound Test: Lotoo’s LE-M1 in-ear headphones have been designed to deliver a high-quality audio experience across various music genres. Here’s an in-depth analysis of their sound performance:

1. Tonal Neutrality: The LE-M1 headphones are known for their tonal neutrality, which means they aim to reproduce audio content without coloration or bias. This neutrality is highly desirable for critical listening, as it allows users to hear music as it was intended by the artist and audio engineer.

2. Frequency Range: With a frequency range that extends from 10 Hz to 40 kHz, the LE-M1s cover a broad spectrum of audio frequencies. This wide range ensures that you can hear deep bass notes and subtle high-frequency details with clarity.

3. Impulse Response: Impulse response refers to how quickly and accurately headphones can reproduce sudden changes in audio signals. The LE-M1 headphones exhibit excellent impulse response, making them capable of reproducing fast transients and dynamic shifts in music faithfully.

4. Bass Performance: The LE-M1s are capable of producing deep and impactful bass. They handle bass-heavy tracks with precision, making them suitable for genres like electronic, hip-hop, and rock. The carbon nanotube composite membranes and the resonance chamber contribute to the headphones’ ability to reproduce low-frequency notes.

5. Treble Clarity: The treble range in the LE-M1 headphones is clear and delicate. High-frequency elements like hi-hats, cymbals, and shakers are rendered with detail and without harshness. This ensures that the headphones are suitable for genres where intricate treble details are essential, such as classical music and jazz.

6. Spatiality and Imaging: These headphones excel in spatiality, creating an immersive listening experience. The soundstage is well-defined, and instrument placement within the mix is precise. This spatial accuracy allows you to appreciate the three-dimensional aspect of music, enhancing the listening experience.

7. Genre Versatility: The LE-M1 headphones perform admirably across various music genres, including pop, rock, jazz, hip-hop, dance, and classical. This versatility makes them an excellent choice for audiophiles with diverse musical preferences.

Sound Quality Summary: The Lotoo LE-M1 in-ear headphones offer an impressive sound quality characterized by tonal neutrality, a wide frequency range, and excellent impulse response. They handle bass-heavy tracks with precision, reproduce treble details without harshness, and provide an immersive spatial experience. Their versatility across different music genres makes them a valuable choice for audiophiles and professionals who prioritize high-quality sound reproduction.

Overall, the LE-M1 headphones are capable of delivering an authentic and engaging audio experience, making them suitable for both critical listening and enjoying music across various genres.


Lotoo’s LE-M1 in-ear headphones stand out as a compelling choice for audiophiles, professional users, and music creators alike. With its impeccable craftsmanship, comfortable design, effective noise isolation, and, most importantly, outstanding sound quality, these headphones demonstrate that China is a force to be reckoned with in the world of high-end audio products. While additional accessories and a longer cable would enhance its versatility, the LE-M1 is undoubtedly a noteworthy addition to the audiophile landscape.

Pros of Lotoo LE-M1 In-Ear Headphones:

  1. High-Quality Sound: The headphones offer authentic and high-quality sound reproduction across various music genres, making them suitable for audiophiles and professionals.
  2. Tonal Neutrality: They provide tonal neutrality, ensuring that music is reproduced without coloration or bias, allowing for a true listening experience.
  3. Wide Frequency Range: With a frequency range from 10 Hz to 40 kHz, these headphones cover a broad spectrum of audio frequencies, delivering deep bass and detailed treble.
  4. Impulse Response: The LE-M1 headphones exhibit excellent impulse response, allowing them to accurately reproduce fast transients and dynamic shifts in music.
  5. Comfortable and Secure Fit: They are comfortable to wear, and the design ensures a secure fit, effectively isolating ambient noise.

Cons of Lotoo LE-M1 In-Ear Headphones:

  1. Limited Accessories: The package lacks some essential accessories, such as an additional cable or a 6.35 mm adapter, which could limit their versatility for different use cases.
  2. Thin Cable: While the headphones themselves are well-constructed, the included cable is described as extremely thin, which might raise concerns about durability for some users.
  3. Packaging Size: The packaging is larger than necessary, which may be seen as excessive by some users, potentially leading to increased shipping and storage costs.
  4. Language Barrier: The presence of Chinese characters on the packaging and instructions, along with poor contrast in the Quick Guide, could make it less user-friendly for those who don’t understand Chinese.
  5. Wired Design: In an era where wireless earbuds are gaining popularity, the LE-M1’s wired design might be seen as less convenient for users looking for a wireless experience.

Overall, the Lotoo LE-M1 In-Ear Headphones offer impressive sound quality and build, but they may benefit from including additional accessories and addressing language-related issues to enhance user satisfaction.