Acoustune HS1657CU
Best in-ear monitors for audiophiles seeking precision and premium Japanese craftsmanship.
Immerse yourself in superior sound with the Acoustune HS1657CU In-Ear Monitor Headphones. Featuring a newly developed 4th generation Myrinx driver within a precisely tuned brass chamber, these headphones deliver exceptional audio fidelity and clarity. Designed for discerning listeners, they offer a comfortable and secure fit for extended use. The package includes a high-quality PentaconnEar connector, an 8-core silver-coated OFC cable for pristine signal transmission, and a luxury aluminum case for protection. Meticulously crafted in Japan, the HS1657CU is ideal for both professional monitoring and everyday listening.
$699.99
Owner Satisfaction
4.5
/ 5
Category Rank
770
/ 5783
#770 in Headphones
Price vs Category Average
+19%
Above average
Driver unit
104
/ mm Dynamic Type th Generation Myrinx driver (Myrinx + thin film titanium dome)
Who it's for
- Listeners who value high-resolution clarity and micro-detail
- Bass lovers seeking punchy, controlled low-end performance
- Audiophiles prioritizing build quality and resonance-free sound
Who should skip it
- Cable swappers preferring standard 2-pin or MMCX compatibility
- Users with sensitive ears needing lightweight, long-term comfort
- Treble heads craving maximum airiness and top-end sparkle
Performance breakdown
Acoustic Fidelity
The Myrinx driver delivers exceptional clarity and nuanced sound reproduction.
Build Integrity
Precision-machined brass chamber ensures long-term durability and acoustic resonance.
Signal Transmission
Eight-core silver-coated cable minimizes interference for a pristine audio path.
Ergonomic Comfort
Secure fit allows for fatigue-free listening during extended studio sessions.
Passive Isolation
Effective seal blocks ambient noise without relying on digital processing.
Connection Reliability
PentaconnEar interface provides a robust and stable connection for professional use.
Key Specs
Driver unit
10 mm Dynamic Type 4th Generation Myrinx driver (Myrinx + thin film titanium dome)
Sound Chamber Material
Brass
Sensitivity
110dB 1mW
Maximum input
100mW
Impedance
24 Ohm
Frequency characteristics
10Hz to 25kHz
Connector
Pentaconn Ear
Cable Specification
ARC51 8 Wire Hybrid Cable. Silver-coated OFC & extra-fine OFC, triple shield, double twist 8-core structure, black sheath.
Features
- Advanced 4th gen Myrinx driver for detailed sound
- Brass chamber enhances acoustic performance
- Secure PentaconnEar connector
- High-fidelity silver-coated OFC cable
- Premium Japanese craftsmanship
- Customizable fit with multiple ear tips
- Luxury aluminum case included
What customers say
Reviewers consistently praise the Acoustune HS1657CU for its exceptional build quality and satisfying audio performance. The machined brass housing feels robust and luxurious, suggesting excellent longevity. Sonically, the presentation is warm and musical. Listeners frequently highlight the deep, textured bass that adds impact without masking the natural midrange. The smooth treble ensures a nonfatiguing experience ideal for extended listening sessions across various music genres. While the shells are substantial, most users find them surprisingly comfortable once properly positioned. This combination of stellar construction and engaging sound validates the premium feel for those seeking a top tier single dynamic driver experience.
Know before you buy
The brass chamber acts as a rigid, high-density housing for the driver. This material choice helps minimize unwanted resonance and vibration, resulting in a more precise, controlled, and resonant sound profile.
No, the HS1657CU relies on passive noise isolation. By achieving a proper seal with the included ear tips, the physical design of the housing effectively blocks out ambient environmental noise.
The PentaconnEar is a high-precision connector designed for superior signal transmission and durability compared to standard MMCX or 2-pin connectors. Because it is a proprietary design, you will need to ensure any replacement cables are specifically compatible with the PentaconnEar standard.
Yes, the HS1657CU is designed for both professional monitoring and casual listening. Its 4th generation Myrinx driver provides a detailed, accurate frequency response that is well-suited for critical listening tasks.
The 8-core hybrid cable is engineered to reduce signal loss and interference. The silver-coated OFC (Oxygen-Free Copper) construction helps maintain signal purity, which typically results in improved clarity and a more refined high-frequency response.
Yes, the HS1657CU is designed for ergonomics, and the package includes multiple ear tip sizes to help you achieve a secure, personalized fit. While comfort is subjective, the lightweight 45g build is intended to minimize fatigue during extended use.
Still have a question?
Ask Hayley anything about this product before you decide.