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D645 Dynamic Super Cardioid Microphone

 

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1597B Passive Monitor Panel

SPECIFICATIONS


Element Type: Dynamic moving-coil

Element Material: Mylar

Frequency Response: 80 Hz - 15 kHz (See Figure 1)

Pickup Pattern: Super-cardioid (See Figure 2)

Ideal Application: Expressive speech, from a distance, fixed position, working against noise or feedback

Load impedance: 150 f2

Output Level: -56 dBm at 1 Pa

Case Material: Steel shank, woven spring steel grille

Case Finish: Fawn beige micromatte

Connector Supplied: 3-pin locking, A3M-type, in shank

Polarity: A compression wave at the diaphragm produces a positive voltage at pin 2

Weight: 6 oz. (170 g)

Dimensions: 6.56" (16.7 cm) long 0.75" (1.9 cm) shank diameter
1.375" (3.5 cm) largest diameter

Included Accessories: 25' (7.6 m) microphone cable, P/N 60-09-124374 Stand clamp,

DESCRIPTION


The Altec Lansing model D645 dynamic super-cardioid microphone is intended to capture the spoken word from a microphone stand or from a footlight shoe, under adverse noise or feedback conditions, or from a distance. The frequency response is outstandingly smooth all the way to 15 kHz, permitting great naturalness and accuracy of inflection and expression to the voice. Bass response is reduced below 150 Hz (to -10 dB at 50 Hz), and this eliminates the annoying tubthumping sound while actors walk across the stage, graduates file across the platform, or the choir rises to sing.

Cardioid microphones have an off-axis null along the direction of the shank of the microphone. The Altec Lansing D645 is a super-cardioid and it has a conical rejection pattern with 30° skirts around the shank of the microphone. The result is greater rejection of offaxis sounds than a cardioid. This permits excellent performance in feedback-prone systems, and in systems where audience or studio noise must not be amplified or broadcast.

Anywhere that a microphone on a gooseneck must reach across a lectern, or a microphone in a footlight shoe must reach across a stage, and pick out an expressive voice accurately, the Altec Lansing D645 is the microphone of choice. It also selects the voice presented along its axis and rejects audience or studio noise, or feedback components, arriving from the rear. It also reduces, gracefully but effectively, non-voice bass sounds. The D645 is perfectly optimized for this everyday application.


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