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manual abstract
Engineered for accurate sound reproduction, each microphone is ruggedly constructed to withstand the demands of sound installations. A variety of types and styles are available including gooseneck, desktop, handheld, wireless handheld/lavaliere, overhead hanging, and surface- mount microphones. Both contemporary and traditional designs provide accurate response and dependable performance, with Bogen’s microphone models are crafted with professional-grade features, including models with rubberized grips, dent-proof screens, and quiet on/off glide switches. In addition, Bogen’s handheld mics feel good in the hand and reduce resonance from taps and handling. A variety of accessories are available for Bogen’s line of microphones - including stands, mounting clips, and cables. optimum clarity. Cardioid (Uni-Directional) This pickup pattern is sensitive to sound coming from one direc- tion - in front of the microphone - thus, it best serves a single user. It is preferred for applications where there is likeli- hood of feedback, where the ambient noise is too high or variable for a good clear signal, or where the user will be close to the microphone. Microphones with a cardioid pickup pattern greatly reduce the chance of reproducing unwanted sources of noise that are at the back or sides of the microphone, such as with an audience. Omni-Directional This microphone pickup pattern is sensitive to sound from all directions - in front, back, and on the sides of the microphone - thus, best serving a group of users. Omni-directional micro- phones are preferred for use in studios, offices, round-table dis- cussions, or other environments where there is no ambient background noise (such as a conference room). Microphones with an omni-directional pickup pattern provide a smoother re- sponse than microphones with a cardioid pickup pattern. Cardioid Omni-Directional Sensitivity Patterns Microphones pick up sound differently, based on the type of sensitivity pattern. There are two main types of microphones or patterns: Cardioid and Omni-Directional. Dynamic vs. Electret Condenser Microphones are transducers, or energy converters, which sense acoustic energy (sound waves) and convert them into electrical energy signals. There are two common methods for microphones to do this: 1) the electromagnetic technique used in dynamic type microphones, and 2) the electrostatic technique used in electret condenser type microphones. Dynamic Dynamic microphones consist of a coil of wire attached to a diaphragm that sits in a magnetic field that is created by a small magnet. When sound waves cause the diaphragm to vibrate, the motion of the coil within the magnetic field creates electrical signals that can be amplified or recorded. These types of microphones produce a smooth, extended response, and provide good linearity. Their output level is high enough to work directly with most microphone inputs and have an excellent signal-to-noise ratio. They are rugged, reliable, and do not require batteries or external power supplies to operate. Electret Condensers Electret condenser microphones use a lightweight, permanently- polarized membrane and a fixed plate to create a capacitor. Sound waves cause the membrane to vibrate, which changes the distance between the membrane and fixed plate causing a change in capacitance. Using a built-in electronic pre-amplifier circuit, the capacitance fluctuations are converted to electrical signals that can be amplified or recorded. Because of the built-in pre-amplifier, power must be supplied to the microphone externally. For convenience, the same shielded 2-conductor cable that carries the audio from the microphone is used to supply the DC voltage to the microphone’s pre-amp circuit. This method of supplying power to the microphone is called “Phantom Power”. Electret condenser microphones respond quickly, have excellent linearity, and are very sensitive. They respond with clarity to transient sounds, provide a very uniform frequency response, and have an outstanding low-frequency pickup. HANDHELDS Handheld Public Address Microphone HDO100 Delivers smooth, professional sound. Provides a custom-tailored balanced response to complement any vocal style and timbre for singing, speech, or instrument sound reproduction. Uniform pickup of sound from all directions with no deterioration in frequency response. Clean, clear reproduction with minimal ambient sound. Low sensitivity to handling noise and stage vibrations. Slim design provides optimum handling and control. Features an internal rubber shock isolation system, a rigid low noise cable mount system, and a lockable silent on/off reed switch. (6 -1/2" D x 1- 1/2" dia., 13 oz.) • Durable all-metal zinc case w/rubberized black finish • Omni-directional pickup pattern • Moving coil dynamic element • 500-ohm impedance • Frequency response range of 70 Hz -15 kHz • Sensitivity of -72 dB +/-3 dB Professional Handheld Stage Microphone HDU250 Performs professionally in acou...