Binary EP321 - Hybrid Headphones with Direct Drive MEMS Technology
24.12.2025 06:32 | ~1 minute read
Binary Acoustics has introduced the EP321 ($309.99) in-ear monitors, notable for implementing Direct Drive MEMS driver technology. Unlike conventional MEMS drivers that require external amplification, the EP321's Direct Drive MEMS operates from an integrated power source, functioning without a dedicated amplifier.
The Binary Acoustics EP321 uses 2× dynamic drivers (10 mm + 6 mm passive radiator for bass), 3× balanced armature drivers (1 wideband for midrange, 2 for highs), and 1× direct drive MEMS (ultra-high frequencies). The MEMS driver achieves ultra-low distortion and exceptional purity in the super-high frequencies.
The Binary Acoustics EP321 combines advanced internals with striking industrial design. The shells feature CNC-machined stainless steel faceplates with irregular geometric patterns that catch and reflect light differently from various angles. The inner shell is precision 3D-printed from high-quality resin.
Specifications
This product is in the Hi-Fi and High End Electronics and Acoustics database
Headphones — Binary Acoustics EP321
Model name
EP321
Transducer principle
Dynamic or Isodynamic
Scheme
Closed
Wearing style
In-ear
Frequency response low +/- 10dB (Hz)
8
Frequency response high +/- 10dB (Hz)
40 000
Max. sound pressure level (dBSPL (1 kHz @ 5% THD))
N/A
Connection type
Wired
Connector (mm)
3.5mm/4.4mm
Sensitivity (dBSPL (1 kHz/ 1 mW)))
122
Impedance (Ohm (1 kHz))
13
Playback time (hours)
N/A
Weight (g)
7.5
Official link
More content
