BASN Metalen PRO 4 Drivers In-Ear Monitors - Detailed Sound

In this review of the BASN Metalen PRO in-ear monitors, the bottom line is simple: these earphones suit musicians and serious listeners who want detailed, stage-ready sound and strong noise isolation. The single biggest reason to buy is the hybrid four-driver configuration that combines two balanced armature drivers with two dynamic drivers per earbud, delivering clearer mids, crisp treble, and enhanced bass response in a compact, metal-crafted package. The review focuses on sound, build, and real-world use for stage and studio work.

Key Features

• Four hybrid drivers: Two balanced armature and two dynamic drivers per earbud provide detailed separation and a fuller low end compared with single-driver buds.
• Excellent sound isolation: The closed-fit design blocks ambient noise so performers and recording artists can monitor clearly on stage or in rehearsal.
• Detachable MMCX cables: The mmcx connectors allow easy cable replacement or upgrade to protect the headset from long-term wear.
• In-line volume and mic cable: A fiber cable with inline volume and mic adds convenient control for mobile use and basic calls.
• CNC metal craft shell: Electroplated metal housings resist corrosion and give a durable, premium feel that stands up to frequent handling.
• Complete accessory kit: Includes multiple tips, memory foam, a 1/4 in adaptor and a carrying case so the set is ready for stage use out of the box.

Who It's For

These IEMs are aimed primarily at musicians, vocalists and sound technicians who need accurate monitoring on stage or in the studio and appreciate strong isolation. The balanced armature drivers help with vocal clarity while the dynamic drivers add impact to basslines, making them useful for performers who want a single pair for both monitoring and reference listening.

Listeners who prefer wireless convenience, those who demand the absolute last bit of audiophile refinement, or anyone who cannot tolerate wired cables may want to look elsewhere. Also, buyers who are worried about long-term cable reliability should consider keeping a spare replacement cable on hand despite the detachable design.

Pros & Cons

Pros

• Clear, balanced sound with distinct mids and treble suitable for vocal monitoring and stage use.
• Strong passive noise isolation that helps reduce stage bleed and ambient noise.
• Robust metal housings with CNC craft and electroplating for long-term durability.
• Included accessory kit and detachable cables make the package versatile and serviceable.

Cons

• Cable quality receives mixed feedback from users, so replacing a failing cable may be necessary over time.
• Wired design and MMCX connectors add complexity compared with simpler single-cable earphones.

Specifications

Drivers	2 balanced armature + 2 dynamic per earbud
Cable options	Silver-plated OFC cable and fiber cable with inline volume mic
Connectors	Detachable MMCX
Shell material	CNC metal with electroplating
Included accessories	Multiple ear tips (S,M,L), memory foam, clip, brush, velcro, 1/4 in adaptor, carrying case
Cable length	Approximately 4.9 ft

Our Verdict

The BASN Metalen PRO offers musicians and serious listeners a compelling mix of clarity, bass presence, and durable metal construction at a reasonable price. The hybrid driver set and strong isolation make these IEMs particularly well suited to stage monitoring and vocalists, and the detachable cables and full accessory kit add practical value. Keep a spare cable handy if cable longevity is a concern.

Frequently Asked Questions

Are the cables replaceable?
Yes. The Metalen PRO uses detachable MMCX cables and ships with a silver-plated OFC cable and a fiber cable with inline volume and mic, so cables can be swapped or upgraded.

Do they block stage noise well?
Yes. The closed fit and included foam tips provide strong passive isolation suitable for stage and studio monitoring.

Is the build quality good for regular gigging?
Yes. CNC metal shells with electroplating improve corrosion resistance and durability, though some users report mixed experiences with cable longevity.