1. Microphones By Trevor Reisig Music Products Seminar MUS 420

2. Microphones are transducers which detect sound signals and produce an electrical image of the sound, they produce a voltage or a current which is proportional to the sound signal. Microphones

3. The most common microphones for musical use are dynamic, ribbon, or condenser microphones. Besides the variety of basic mechanisms, microphones can be designed with different directional patterns and different impedances. Types of Microphones Structure:

4. Sound moves the cone and the attached coil of wire moves in the field of a magnet. The generator effect produces a voltage which "images" the sound pressure variation - characterized as a pressure microphone. Dynamic Microphones

5. Advantages: -Relatively cheap and rugged. -Can be easily miniaturized. Disadvantages: -The uniformity of response to different frequencies does not match that of the ribbon or condenser microphones. Dynamic Microphones

6. Performance tested, industry standard Uniform cardioid pick-up pattern for maximum gain before feedback and excellent rejection of off-axis sound Tailored frequency response specifically shaped for vocals, with brightened midrange and bass roll off to control proximity effect Steel-mesh grille and enamel-coated metal construction resist wear and abuse Effective built in pop-filter reduces undesirable wind and breathe noise Dynamic Microphones $89.00- $100.00

7. The air movement associated with the sound moves the metallic ribbon in the magnetic field, generating an imaging voltage between the ends of the ribbon which is proportional to the velocity of the ribbon - characterized as a "velocity" microphone. Ribbon Microphones

8. Ribbon Microphones Advantages: -Adds "warmth" to the tone by accenting lows when close-miked. -Can be used to discriminate against distant low frequency noise in its most common gradient form. Disadvantages: -Accenting lows sometimes produces "boomy" bass. -Very susceptible to wind noise. Not suitable for outside use unless very well shielded.

9. Figure 8 polar pattern for outstanding side rejection and precise directivity High SPL capability Delivers an unbelievably natural sound and stunning realism for vocal and instrument recordings Distinctive body design with purple and chrome metal finish Includes R144 ribbon microphone, shockmount, carrying case, cleaning cloth, manual, & application guide Wired with Mogami cableRecommended for: Vocals Electric guitar Percussion Strings Brass horns Ribbon Microphones $100-$200 Shure KSM313 $1,295.00

10. Sound pressure changes the spacing between a thin metallic membrane and the stationary back plate. The plates are charged to a total charge where C is the capitance, V the voltage of the biasing battery, A the area of each plate and d the separation of the plates. Condenser Microphones

11. Advantages: -Best overall frequency response makes this the microphone of choice for many recording applications. Disadvantages: -Expensive -May pop and crack when close miked -Requires a battery or external power supply to bias the plates. Condenser Microphones

12. Condenser Microphones AKG C 4000 B Stage & Studio Condenser (Phantom Power) $649.00

13. RF (Transmitting) Mics PZM™ Dummy Head Shotgun Sub-types

14. Directional Patterns of Microphones

15. Manufactures