Sennheiser HD414

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Sennheiser HD414 - Overview

Original released in 1967 (Patented in 1967) and was the first open dynamic headphone design and sold in about 10 million units. It seems Sennheiser have released several similar headphones under the name HD414, but with some technical and cosmetic differences.

HD414, 1968

Impedance: 2000 ohms

Sensitivity: 102dB/mW (1.41V)

Weight: 5 oz. without cord

Notes on manufacturer-supplied frequency-response graph: Rolls off @6dB/octave below 50Hz; flat from there to ~1.5kHz, whereupon response rises rapidly and peaks at +4dB @2kHz; thereafter it rolls off at about 3dB/octave with a slight dip at 5kHz and a faster rolloff above 12kHz.

HD414, March 1983

This model was released in March 1983 and with following specification (according to this link [1])

Technical specifications

Impedance (Nominal): 600 ohm

Type: Dynamic

Frequency response: 20-20,000 Hz ±?

Sensitivity at 1 kHz : per driver 94 dB at 1 mW power

Max continuous power: 0.1 W (DIN45D0, DIN455B2)

Distortion: ≤ 1 % (DIN455DO)

Headband pressure: ~2.5 N

Weight: 74g (without cable)

Cable: 3 m and "Universal plug PX1, stereo" (aka DIN-connector?)

Specific data for HD414-3

Same as HD414 (March 1983) but with a 6.3 mm plug and 50 ohm impedance

Specific data for HD414-13

Same as HD414 (March 1983) but with 6.3 mm plug

HD414 50th Anniversary Edition

Released in 1995 to the 50th anniversary of Sennheiser GmbH & Co

Technical specifications

Frequency Response: 18-21000 Hz

Type: Dynamic, open

Impedance (Nominal): 52 Ohms

Sound pressure level at 1 kHz: 94 dB +/- 2 dB

THD as per DIN 45500: < 0.9 %

Contact Pressure: ~2.8 N

Weight (without cable): ~80g

Connector: 3.5 or 6.3 mm (1/8" or 1/4") stereo jack plug

Connection cable: Oxygen Free Copper cable, 3m

Pricing & Other Data of Interest

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