Common name: Electro-Voice 668
Production Status: Discontinued / Vintage
The 668 is a dynamic cardioid broadcast microphone produced around 1964. It is designed for boom mounting in broadcast and film recording applications. It features a specially designed shock mount to provide isolation from mechanical noise and an integral Acoustifoam windscreen to minimise air motion noise. These are easily removable for service or replacement. The microphone and the shock mount are lightweight and easy to handle making the combination ideal for “fish poling”. The microphone has a self-contained programming board that provides 36 different response curves. The programming panel controls a passive equaliser. This can be used to overcome bad acoustics or to emulate the response of other microphones as well as for special effects.The 668 uses the Continuously Variable-D principle, an evolution of the patented Variable-D where uniform rejection of unwanted noise is achieved with two identical slotted tubes coupled to the back of the diaphragm, whose length varies inversely with sound frequency in order to phase out unwanted sound. The diaphragm is a non-metallic Acoustalloy type, providing smooth frequency response while being immune to high humidity, temperature swings and corrosion. The impedance can be switched between 50, 150 and 250 ohm. Includes 2-foot, 2 conductor, shielded, mechanical isolation cable and 20′, 3-conductor shielded field cable.