The Shure Model 515SDX is a dual-impedance, cardioid (unidirectional) dynamic microphone that is suitable for speech pickup in schools, churches, and meeting rooms. Its unidirectional polar pattern greatly reduces feedback. The 515SDX includes a locking ON/OFF switch and an internal impedance selection socket mounted on the XLR connector for switching between high and low impedance. A slip-in swivel adapter is supplied for stand-mounted use.
Rolled-off low-frequency response combined with a smooth high-frequency rise for clear and intelligible voice pickup
Symmetrical cardioid pickup pattern minimizes feedback
Neodymium magnet for high signal-to-noise ratio
Shock-mounted cartridge that minimizes handling noise
Lockable ON/OFF switch
Dual impedance selectable by internal socket
Slip-in swivel adapter for stand-mounted use
Three-pin professional audio connector, the industry standard, for maximum interchangeability of cables
Tough, die-cast grille resists wear from constant use and handling
Field serviceable and backed by the Shure 2-year warranty
Basic Rules for Microphone Use:
Aim a directional microphone toward the desired sound source (for instance, a talker or singer) and away from undesired sources (such as loudspeakers)
When extra bass response is desirable, work close to the microphone. During closeup use, the low frequency output will increase. This increase is called “proximity effect.” Refer to the frequency response curve
Locate the microphone as close as practical to the desired sound source to get the most gain before feedback.
Do not pick up the same sound source with more than one microphone. Keep the distance between multiple microphones at least three times the distance from each source to its intended microphone.
Use the fewest number of microphones possible.
Locate microphones as far as possible from acoustically reflective (hard or smooth) surfaces.
Add an external windscreen when additional pop protection is needed (outdoors in windy conditions or closeup vocal use, for example).
Avoid excessive handling of the microphone; doing so will minimize mechanical noise pickup.
Keep the grille unobstructed; doing so will preserve the microphones directional characteristics.
Frequency Response: 80 to 15,000 Hz
Polar Pattern: Cardioid (unidirectional)
Output Level (at 1,000 Hz):
- LO Z: Microphone rating impedance is 150 ? (270 ? actual) for connection to inputs rated low impedance
- HI Z: Microphone impedance is “High” for connections to high-impedance microphone inputs.
Phasing: Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 in both HI Z and LO Z modes
Switch: Built-in ON/OFF switch, lockplate to lock switch ON
Connector: Three-pin professional (male XLR) type
Cartridge Shock Mount: Internal rubber vibration-isolator
Swivel Adapter: Positive action, break-resistant, adjustable through 180 , slip-out removal for handheld use, designed for mounting on stand with 5/8 in.–27 thread
Case: Platinum beige enamel die casting with platinum beige die-cast grille and stainless steel screen
Net Weight: 315 grams (11.1 oz)
Certification: Conforms to European Union directives, eligible to bear CE marking; meets European Union EMC Immunity Requirements (EN 50082–1: 1992).
- Open Circuit Voltage: LO Z: –56.0 dBV/Pa(1.6 mV), HI Z: –37.5 dBV/Pa(14 mV)