The Electro-Voice Model DS35 cardioid dynamic microphone
Hear an Ovation acoustic guitar chord recorded with this mic.
Description and Applications The Electro-Voice Model DS35 is a dynamic single-D cardioid microphone created specifically for professional applications. The single-D design emphasizes low frequencies when used close up. Perfect for the exacting needs of high-quality sound reinforcement and other professional performer applications where proximity effect or bass boost is desired, the DS35 is ruggedly designed and attractively styled. The broadcast painted finish of fawn beige micromatte minimizes glare for camera use.
An exclusive Volumetric-hologram-designed diaphragm provides exceptionally wide, linear response at all angles of incidence for extremely high gain-before-feedback in sound reinforcement applications and virtual elimination of off-axis coloration.
The head assembly is shock-mounted in the case by a pneumatic shock absorber which very effectively isolates the transducer assembly from mechanical noises. A blast filter is integral with the microphone to allow close talking without excessive P popping, and also prevents dirt and magnetic particles from accumulating on the diaphragm. The DS35 also employs a Memraflex grille screen that bounces back to retain its shape.
Using the Variable Low-Frequency Response The DS35’s low-frequency response varies with the distance from the sound to the microphone as shown in the response curve (Figure 3). Maximum bass response is produced in close-up use with the microphone one-quarter-inch from the sound source (Figure 3-A). Minimum bass response is experienced at distances greater than 61 cm (24 inches) (Figure 3-C). Useful effects can be created by imaginative application of the variable low-frequency response:
By working closer to the microphone than might otherwise be natural, the human voice will sound more robust.
Feedback in a public address system is sustained by reflection of sound into the microphone. For all microphones, as the artist moves closer, the level of his voice (at the microphone) increases and the microphone’s signal to the amplifier is increased. For a constant volume of sound from the system, the amplifier gain setting must be proportionately reduced. This results in a reduction of the system’s sensitivity to reflected sound, hence a reduction of the tendency to feed back. The variable low-frequency response of the DS35 provides a further feedback-reducing advantage in close-talk applications. At one-quarter-inch, low-frequency response is greatly enhanced, while response to distant sound (as from sound system loudspeakers) is unaffected. The result is a reduced tendency to feedback over and above that provided by the cardioid directional characteristic alone. In short, system sensitivity reduction because of close working, added to the advantage resulting from the bass-boosting low-frequency characteristic of the DS35, makes this instrument an exceptionally effective tool for stage and nightclub use.
For musical pickup, the variable bass response can be utilized to achieve clean bass pickup at distances of 305 cm (12 inches) or more. By moving the DS35 to a few inches from the instrument, bass will be increased.
Text and illustrations are from Electro-Voice Engineering Data Sheet Part Number 535263–630