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RCA 77-DX Ribbon Microphone
RCA 77-DX Ribbon Microphone

Rental Day Rate $75.00

Quantity in Stock:(Out of Stock)

Product Code: RCA-77
Rental Only

Pair available.

The RCA Type 77-DX Poly-directional Microphone is a high-fidelity micro­phone of the ribbon type which may easily be adjusted to obtain a variety of directional patterns.
Instead of being open on both sides as in the conventional velocity mi­crophone, the ribbon element in this micro­phone is coupled to an acoustic labyrinth which forms the body portion of the micro­phone. The tube connecting the back of the ribbon to the labyrinth is slotted directly behind the ribbon and fitted with an adjustable shutter to secure various areas of opening. When the opening is completely closed, the micro­phone operates as a non-directional pressure micro­phone; at the wide-open position the micro­phone becomes bi-directional. With the proper size opening the pattern becomes a cardioid by virtue of the phase shift which occurs. Openings smaller or larger than this critical size produce directional patterns with various sized rear lobes. Different amounts of low-frequency attenuation are obtained by a reactor shunting the output.

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