Includes: Shure ILP-1 Condenser Microphone Preamp, Cable & Storage Pouch
The SM90 Microphone is designed specifically for surface-mounted applications. It is a professionalquality permanently-biased condenser microphone with a hemispherical pickup pattern (omnidirectional in the hemisphere above the mounting surface.) The SM90 takes advantage of the well-known principle that, at a barrier or boundary, sound pressure doubles compared to its value if the boundary is removed. When placed sufficiently near the boundary surface, a microphone has effectively 6 dB higher sensitivity and approximately 3 dB greater rejection of random background noise. Because of its high sensitivity and extremely flat frequency response, the SM90 can be used for distant pickup in circumstances where close miking would not be practical. The low-frequency cutoff switch in the preamplifier permits using the SM90 even in environments where low-frequency noise (e.g., from fans or air conditioners) would otherwise make distant pickup impossible. And the omnidirectional polar pattern of the SM90 means sound is picked up equally in the full 360° hemisphere around the microphone; there is no off-axis sound coloration or variation. The SM90 can also be used for close pickup of an individual instrument, mounted, for instance, inside the lid of a grand piano or on the floor next to a bass drum. Experimentation and critical listening will demonstrate the best location for any particular purpose or effect desired.
The carefully optimized design of the SM90 includes an entirely new cartridge, developed at Shure. The result is high output and extremely faithful sound reproduction across the entire audio frequency range. The supplied low-distortion, high-clipping-level preamplifier provides switch-selectable low-frequency Flat or Lo-Cut response for additional help in obtaining the best possible microphone signal even under difficult conditions. The SM90 is powered either by two readily available 9-volt alkaline batteries (300 hours continuous battery life) or by an 11-to-52 Vdc simplex (phantom) supply from broadcast, sound-reinforcement, or recording equipment. The SM90 consists of a small, rugged, surfacemounted microphone finished in professional durable matte-black enamel; a 7.6m (25 ft) small diameter twoconductor shielded interconnecting cable with two 3-socket miniature Switchcraft connectors; and a sturdy preamplifier assembly with battery compartment, battery On/Off switch, green LED battery-condition indicator, low-frequency Flat/Lo Cut switch, and standard 3-pin professional audio connector output.