Technics EAH-420 (Mid 1970s)
A quadraphonic ambience headphone model released by Technics during the height of 4-channel audio experimentation.
Overview
The Technics EAH-420 is a 4 Channel Ambience Headphone developed by Technics, a brand under Panasonic Japan. Designed for use with quadraphonic audio systems, it was marketed in the mid 1970s as part of the brief but ambitious push toward immersive, multi-directional sound reproduction. These headphones are also referred to as "Quadraphonic headphones" or "Stereo / Quad headphones," indicating their intended compatibility with both stereo and four-channel formats. Each earcup contains three speakers, enabling discrete 4-channel playback, and the unit features a chrome finish with a single-sided detachable cable.
Specifications
| Type | Closed-back dynamic headphones |
| Impedance | 8 ohms |
| Frequency Response | 20 - 20,000 Hz |
| Sensitivity | 108 dB/mW |
| Maximum Input | 1,000 mW |
| Driver Diameter | 40 mm |
| Weight (without cable) | 180 g |
| Cable Length | 2.5 m |
| Plug | 3.5 mm stereo mini plug |
Design
The EAH-420 uses a closed-back dynamic housing with three speakers per earcup to support discrete 4-channel playback. The headphones have a chrome finish and feature a single-sided, detachable cable terminating in a 3.5 mm stereo mini plug.
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