The Shure Model 300 bidirectional ribbon microphone
General The Model 300 ribbon microphone is a rugged stand-mounted unit with a wide-range frequency response and a bidirectional polar pattern. The Model 300 is an excellent choice for broadcasting or recording studios as well as for critical sound reinforcement applications. The microphone’s symmetrical front and rear and its greatly reduced side pickup make it ideal for such uses as across-the-table interviews or dialogue, stages with loudspeakers directly to the side or overhead, and combined pickup of facing instrumental groups in recording sessions.
The Model 300 is supplied with a Voice/Music switch that provides either flat or rolled off low-frequency response and with an impedance-selection switch allowing choice of three rated impedances: “L” equals 38 ohms, “M” equals 150 ohms, and “H” equals high impedance. A built-in vibration isolator and internal ribbon protection make this mic suitable for a wide variety of applications.
Ribbon microphone with wide range response
Switch selectable flat or rolled off low end
Bidirectional polar pattern, ideal for interviews
Internal ribbon protection assures reliable operation under rigorous operating conditions
Built-in vibration isolator and lifetime swivel
Convenient impedance selection switch. Microphone is usable with all amplifiers
Frequency response: 40 to 15,000 Hz (see Figure 1)
Polar Pattern: Bidirectional—uniform with frequency; symmetrical about axis (see Figure 2)
Switches: Rotary Voice/Music response switch and rotary impedance selection switch
Swivel and Shock Mount Assembly: Positive action, permits tilting head through 135°, shock-mounted with internal rubber vibration isolator, suitable for mounting on stand with ⅝"-27 thread
Case: Dark gray enamel die casting and light gray brass screen
Net Weight: 581.5 grams (1 lb, 4 oz)
From the 1977 Shure Professional Products booklet.
The Voice-Music frequency response selector switch.