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 from Technics, a brand under Panasonic Japan. It was built for quadraphonic audio systems and marketed in the mid 1970s, during the brief but ambitious push for multi-directional sound. You will also see it called "Quadraphonic headphones" or "Stereo / Quad headphones," which tells you it was meant to work with both stereo and four-channel formats. Each earcup holds three speakers for discrete 4-channel playback. The finish is chrome, and the cable is single-sided and detachable.
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 has a closed-back dynamic housing with three speakers per earcup for discrete 4-channel playback. The finish is chrome. The detachable cable attaches on one side only and ends in a 3.5 mm stereo mini plug.
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