Description
The AT915AMRx/ML is a wide-range condenser microphone with a MicroLineâ polar pattern. It is designed for quality sound reinforcement, professional recording, television, and other demanding sound pickup applications. The small-diameter alternating gooseneck design permits highly flexible positioning while maintaining a smooth, well-contoured appearance. Its adjustable-length design allows for the ultimate in positioning flexibility. The AT915AMRx/ML features a 5/8"-27 threaded flange that allows it to mate with the threads of a standard microphone desk or floor stand. A 5/8"-27 threaded stud is also provided so it can be secured to a permanent mounting surface.
The microphone features a 9.8' (3.0 m) permanently-attached miniature cable. Its free end connects to the provided AT8533x power module via internal solderless screw terminals for simple length adjustment in the field. It can be powered from any external 9V to 52V DC phantom power supply. A recessed switch in the power module permits choice of flat response or low-frequency roll-off to help control undesired ambient noise.
Four additional interchangeable elements are available to permit selection of angle of acceptance from 90° to 360°.
Audio-Technica design engineers have utilized the newest low-mass diaphragm technology in the quest for superior performance. The permanent charge is now on the fixed back plate, rather than the moving element. With A-T fixed-charge “back plate” construction, a gold-vaporized diaphragm just 2 microns thick (about .000079") can be used. This considerably reduces moving mass, thus improving frequency response and transient response while reducing distortion.
The microphone is enclosed in a rugged housing with a low-reflectance black finish.
Installation and Operation
Output is low impedance balanced. The output connector of the power module mates with XLRF-type cable connectors. The balanced signal appears across Pins 2 and 3, while the ground (shield) connection is Pin 1. Output is phased so that positive acoustic pressure produces positive voltage at Pin 2, in accordance with industry convention.
To attach the microphone cable using the pre-stripped end: Remove the three screws from the base of the power module and slide the outer case off to reveal the circuit board and screw terminals. Next, slide the case onto the cable (narrow end first), and tie a single knot in the cable about 1" from the tinned ends. Do not pull directly on the exposed small wires and shield. Following Figure 3, attach the wires to their respective terminals. Make certain that the terminals are clamped on the conductors, not on the insulation, and that there are no loose strands of wire that might touch other terminals. Replace the case, being certain that it goes over the case grounding contact and that the roll-off switch is accessible. Finish by replacing the three base screws and testing for proper operation.
To shorten the cable: Remove the cable from the module, and cut it to the desired length
(allowing a few extra inches). Next, after sliding the case back onto the cable, tie a single knot in
the cable about two inches from the cut end. Following Figure 2, cut the cable off 1" down the top of the knot and carefully remove 1/2" outer jacket. Strip the mic cable wires and them to their respective terminals. Reassemble the module following the instructions in the paragraph.
By removing an attached AT8533x power module, the cable from the microphone can routed through the bottom of the flange instead of exiting from the side as supplied (Fig. 1).
Figure 1. Cable routing
The provided foam windscreen simply over the MicroLine element, effectively reducing wind noise or “popping” when used extra close
The small-diameter gooseneck is easy manipulate for proper positioning. Heavily lubri cated, it operates smoothly and quietly. Should the unit become noisy with prolonged use,
a light machine oil directly on the gooseneck affected.
While a modern condenser microphone not unduly sensitive to the environment, ture extremes can be harmful. Exposure to
temperature can result in gradual and permanent reduction of the output level. Avoid leaving the microphone in the open sun or in areas where temperatures exceed 110° F (43° C) for long periods of time. Extremely high humidity should also be avoided.
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Frequency Response (Typical) |
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in dB |
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10 dB |
Response |
50 |
100 |
200 |
500 |
1k |
2k |
5k |
10k |
20k |
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Frequency in Hertz |
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LEGEND |
12" or more on axis (flat) |
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Roll-off |
Terminal |
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screws |
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Case |
Ye low-Yellow |
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grounding |
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contact |
Red-Red |
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Shield |
Y |
R |
1" |
S |
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Yellow-Yellow |
PC board |
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1/2" |
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Red-Red |
switch side |
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1/8" strip reds
and yellows
Shield strands, fully twisted
Figure 2 |
Figure 3 |
AT915AMRx/ML
â
Miniature
Condenser Adjustablelength Gooseneck Adaptermount Microphone
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