Sennheiser HD-490 PRO B-Stock

The Sennheiser HD 490 PRO, with its high-end 38mm drivers, is capable of reproducing a frequency range of no less than 5Hz to 36.1kHz – an unusually wide spectrum, even for reference headphones. The sound profile has been further optimised thanks to numerous very sophisticated design elements: For instance, the HD 490s' clearly defined, full bass response has been achieved by integrating a special low-frequency cylinder system. Harmonic distortion, on the other hand, is kept to a minimum by an innovative open-frame architecture, which results in a particularly clear and precise sound and minimises resonance. The resultant distortion factor is less than 0.2%, which is as low as it sounds. The ergonomic design, with velour and fabric ear pads, ensures comfort even when mixing for several hours. The impedance of the headphones is 130 ohms.

In June 1945, Prof. Fritz Sennheiser founded the Wennebostel Laboratory, which initially produced measuring equipment. Commissioned by Siemens in 1945, the young company developed the MD-1 microphone, which was launched in 1946. After the development of further microphones, the company was renamed Sennheiser Electronic in 1958. Two years later, Sennheiser introduced the MD 421 dynamic microphone, which is still in production today and still held in high esteem by many sound engineers. Further groundbreaking developments, such as the HD 414 headphones and the classic MD 441 microphone, hugely enhanced the company's international reputation, eventually making Sennheiser one of the leading manufacturers of microphone and headphone systems in the world.