The Electro-Voice Model DL42 Cardiline
dynamic unidirectional “shotgun” microphone
Description and Applications
The Cardiline® Model DL42 represents the newest state-of-the-art generation in highly directional microphones, utilizing a combination of characteristics of hypercardioid and distributed front opening design. The hypercardioid action gives the microphone essentially uniform characteristics at frequencies up to 500 Hz. At this point, the distributed front opening takes over for the balance of the range to which it responds, providing directional characteristics illustrated in the polar pattern, Figure 3. Benefits derived from this new design include wider range response, better control of polar response, plus high level and greater directivity. These features make possible a working distance which is two, three, or four times that of conventional directional microphones. In deriving the polar pattern (off-axis response) of the microphone, specific considerations were made to achieve the lowest possible directivity index at all frequencies (highest possible directionality). Indeed, the directivity index even down to 100 Hz approaches the theoretical. Maximum attenuation of off-axis energy occurs to the sides of the microphone where such rejection is often most useful. An entirely new shock mount design greatly reduces susceptibility to mechanical shock transference. Also, tailored low-frequency response allows accurate reproduction of input material, while greatly reducing wind noise problems in the low-frequency area. See Figure 1 for frequency response. Ideal for boom use, fish pole use, or handheld applications where added working distance is required, the DL42 offers wide-range response in a comparatively small size, plus greatly increased directivity and working distance.
Figure 1 — Frequency Response
Figure 2 — Dimensions
The Model DL42 is shipped assembled in its own shock mount. The carrying case is designed to house the microphone with the shock mount attached. Note: In order for maximum shock isolation, the special coil cord supplied must be used. The coil cord is designed to reduce shock transference from the shock mount bail to the microphone through the cable. One end plugs into the rear of the DL42 and the other attaches to the clip on the microphone shock mount bail. Regular microphone cable may be run from that point. The DL42 may also be used, with the shock mount, attached to a fish pole. Shock mount design has taken into consideration the necessity for rapid panning, and balance in the shock mount is optimum. The Model DL42 may also be used hand-held. For this purpose a handle is supplied in the accessory compartment of the carrying case. The special coil cord and shock mount bail are removed from the microphone by unplugging the coil cord and unscrewing the two positioning nuts on the bail. The handle is then screwed into one of the holes formerly used to attach the shock mount bail.
Figure 3 — Polar Pattern
- Element: Dynamic
- Frequency Response: 50 to 12,000 Hz
- Polar Pattern: Hypercardioid-line (see Figure 3)
- Impedance: 150 ohms
- Output Level: −50 dB (0 dB = 1 mW/10 dynes/cm²)
- EIA Sensitivity Rating: −144 dB
- Hum Pickup Level: −125 dBm (Reference: .001 gauss field)
- Diaphragm: Electro-Voice Acoustalloy®
- Magnetic Circuit: Alnico V Magnet in non-welded circuit
- Case Material: Aluminum and steel
- Dimensions: 426 mm (16.75 in.) long, 97 mm (3.75 in.) largest diameter (with windscreen). See Figure 2
- Finish: Nonreflecting fawn beige micromatte
- Net Weight: 369 g (13 oz.)
- Gross Weight (includes bail, shock mount and cable assembly): .8 kg (1 lb. 11 oz.)
- Microphone Connector: Switchcraft A3M
- Special Accessories: Coil cord extending from microphone connector to shock mount bail, Screw-on handle, Carrying Case, Windscreen
Figure 4 — Wiring Diagram
Figure 5 — Handle Application
All microphone photographs were obtained via the courtesy of Mr. Bill Busetti, KA0POY.
Text and illustrations are from the Electro-Voice Specifications booklet, available below.