The Sennheiser IE 40 PRO uses an advanced dynamic driver system to achieve it's warm, powerful sound even in extremely loud environments. The compact design combines a secure fit with excellent comfort and the robust construction enables it to stand up to rigours of the live sound environment and the demands of life on the road in the touring music industry.
That’s how Sennheiser see the main use for these great sounding earpieces but they also have a role in TV production when you need to be recording and monitoring discreetly on an obs doc or interviewing people who other people might not want you to interview! Or as production IEM monitoring earpieces of course.
Here are a couple of videos from Sennheiser:-
Impedance 20 Ohms
Frequency response 20 - 18,000 Hz
Sound pressure level (SPL) 115 dB (1kHz / 1 Vrms)
THD, total harmonic distortion < 0.1 % (1kHz, 94dB)
Cable length 1.3m (4.3 feet)
Transducer principle Dynamic
Weight 18 g (0.6 oz)
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