![Sennheiser on Twitter: "Since today is 4.14, we thought we'd honor the headphone that started it all – the iconic HD 414. Released in 1968, it went on to sell more than Sennheiser on Twitter: "Since today is 4.14, we thought we'd honor the headphone that started it all – the iconic HD 414. Released in 1968, it went on to sell more than](https://pbs.twimg.com/media/EVjkA7lXQAEuaCB.jpg)
Sennheiser on Twitter: "Since today is 4.14, we thought we'd honor the headphone that started it all – the iconic HD 414. Released in 1968, it went on to sell more than
![Frequency responses of the HD414 Classic. See captions of Fig. 3 for an... | Download Scientific Diagram Frequency responses of the HD414 Classic. See captions of Fig. 3 for an... | Download Scientific Diagram](https://www.researchgate.net/profile/Tatsuya-Hirahara/publication/237208443/figure/fig10/AS:668754983809036@1536455021507/Frequency-responses-of-the-HD414-Classic-See-captions-of-Fig-3-for-an-explanation-of.png)
Frequency responses of the HD414 Classic. See captions of Fig. 3 for an... | Download Scientific Diagram
![Amazon.com: Neuaufbau des Kopfhörers SENNHEISER HD 414 (German Edition) eBook : Sültz, Uwe H.: Kindle Store Amazon.com: Neuaufbau des Kopfhörers SENNHEISER HD 414 (German Edition) eBook : Sültz, Uwe H.: Kindle Store](https://images-na.ssl-images-amazon.com/images/I/818rcpi+JaL.jpg)