beyerdynamic DT 109

Properties:

For many years, the DT 109 has been the standard headphone /microphone combination for live, remote broadcasting, studio, film, TV and language laboratory application. Rugged, field-servicable construction. The headphone transducers feature extended frequency response. Adjustable, noise-cancelling microphone provides clear, audible speech transmission.

• Highly sensitive headphone and microphone transducers
• Excellent ambient noise attenuation
• Capable of handling very high SPL
• Rugged construction
• Excellent comfort for long-term wearing
• Modular construction for easy servicing

Technical data headphone:

• Transducer type: dynamic
• Operating principle: closed
• Frequency response: 30 - 20,000 Hz
• Nominal impedance: 50 Ω ± 10%
• Nominal SPL at 1 kHz: 94 dB
• T.H.D.: < 1%
• Power handling capacity: 1000 mW 124 dB
• Ambient noise attenuation: approx. 20 dBA
• Sound coupling to the ear: circumaural
• Headband pressure: approx. 4.5 N
• Weight (without cable): 390 g

Technical data microphone:

• Transducer type: dynamic
• Operating principle: pressure gradient
• Frequency response: 40 - 12,000 Hz
• Polar pattern: hypercardioid
• Output voltage: approx. 2.5 mV at a distance of 5 cm
• Nominal impedance: 200 Ω
• Load impedance: ≥ 1000 Ω