The Alctron HE290 is a closed-back studio monitoring headphone featuring 50mm neodymium drivers, a 32Ω impedance, and a 3m cable. It offers a wide frequency response, with some sources citing 10-30000Hz and others 20-20kHz, and a sensitivity of 98 dB SPL (1mW), according to one product listing. It's designed for professional audio engineers and musicians, with a focus on accurate sound reproduction and isolation from external noise. Specifications:
Type: Closed-back
Drivers: 50mm neodymium
Frequency Response: 10-30000Hz or 20-20kHz (depending on source)
Impedance: 32Ω
Sensitivity: 98 dB SPL (1mW) (or 90dB depending on source)
Cable Length: 3m
Material: High-quality aluminum alloy and engineering plastic
Connector: 3.5mm gold-plated stereo jack
Max Power: 300mW