684B
Common name: Altec 684B
Production Status: Discontinued / Vintage
The 684B is a dynamic omnidirectional microphone for broadcasting, telecasting and recording applications. It features the Altec Mylar® “Golden” diaphragm and the sintered bronze protection filter. A built-in polyester foam filter helps minimising breath-noise. The 684B has a tilted frequency response of +4 dB between 100 Hz and 10 kHz to provide high intelligibility of speech while reducing the pickup of low-frequency room “rumble” The impedance is variable by changing pin arrangement at the connector between 30/50 150/250 and 20000 Ohm. Includes 15 feet shielded cable, individual frequency chart, stand adapter and storage case.
Electrical Characteristics
Frequency Response
35Hz - 20 kHz
Output Sensitivity
17.8 mV/Pa
Max SPL
Max SPL, THD:
Self Noise (CCIR)
dB
Self Noise (DIN/IEC)
dB-A
Output Impedance
150/250Ω
Recommended Load
Powering
Supply Current
mA
Alternative Powering
Switchable Options
Pad
Filter/EQ
Physical Characteristics
Connector
XLR-3M
Connector notes
Available Colours
Two-tone baked enamel black and green.
Weight
226.7 g
Length
190.5 mm
Min diameter width
28.5 mm
Max diameter
38.1 mm
Depth
Accessories
Included
5 feet shielded cable, individual frequency chart, stand adapter and storage case.
Optional
180A shock-mount.