The Metalen is a closed, cabled in-ear monitor by BASN Audio, whose earphone catalogue spans dual dynamic, hybrid dynamic plus armature and planar magnetic designs. BASN pitches the Metalen at musicians such as singers, drummers and bassists who need isolation on stage, and it also works as a portable earphone. The name points to its all-metal housing. The standard version is sold in green and blue at USD 119.99.
Key specs that matter
Four drivers per side are combined in a hybrid arrangement - two 10 mm dynamic drivers and two balanced armatures. BASN quotes a frequency response of 20 Hz to 20 kHz, an impedance of 18 ohm and a sensitivity of 102 dB. The cable attaches through detachable MMCX sockets of the protruding type, and the plug at the source end is a 3.5 mm single-ended jack. The shell is closed, so the fit in the ear canal provides passive isolation from outside noise rather than any electronic cancellation.
Engineering and use context
The housings are CNC-machined from metal alloy and given a hard oxidation treatment on the outer surface. The ergonomic shell is compact, the nozzle has a large diameter and sits behind a metal mesh, and two vents sit near the nozzle with a further vent inside the housing. Two silver-plated cables are supplied - a four-core braided lead for listening and a second lead with a three-button microphone for calls and playback control. Both have memory-metal ear guides that hold the cable over the ear, the usual way monitors are worn on stage so that movement does not pull the earpieces out. Because the MMCX joint is detachable, a damaged lead can be replaced without discarding the earphones. In the box are six pairs of tips - three silicone and three foam, each set in S, M and L - an adapter to 6.3 mm, a clip for the lead, a cleaning pick and a zippered hard case.
Pairing
The Metalen is an efficient, easy load and runs from a phone, a laptop headphone jack, a portable player or a small USB dongle DAC, and with the adapter it also connects to mixing desks, keyboards, audio interfaces and belt-pack monitor receivers used in rehearsal rooms. The microphone cable suits smartphones with a headphone socket or an adapter. Third-party MMCX cables, including balanced leads, can be fitted for players with 2.5 mm or 4.4 mm outputs.
Alternatives
The BASN Metalen PRO keeps the same two dynamic plus two balanced armature layout in an electroplated, mirror-polished alloy shell with a second cable carrying an inline volume control.