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The Coles 4038 studio ribbon microphone was originally developed by the BBC as a broadcast microphone. Recognized for its wide, flat frequency response and high sensitivity, the 4038 quickly became a valuable tool in the recording studio as well as broadcast applications. The pressure gradient ribbon transducer is capable of withstanding high sound pressure levels without distortion and the bi-directional (figure 8) polar pattern provides a uniform pick up response at either side of the diaphragm. The bi-directional pattern proves valuable when capturing multiple singers, musical instruments, ambiance capturing and more. The smooth, rich sonic detail of the 4038 has the made the microphone a classic among some of the recording industries most celebrated engineers.
| Transducer | Pressure gradient ribbon |
| Polar Pattern | Bi-directional (figure 8) |
| Frequency Response | 30Hz to 15kHz |
| Dynamic Range (Typical) | Not applicable |
| Signal-to-Noise Ratio | Distortion: Less than 1% at 125dB SPL |
| Maximum Input Sound Level | Not specified by manufacturer |
| Power Requirements | Not applicable |
| Output Impedance | 300 ohm |
| Output Connectors | 3-pin XLR |
| Pad | No |
| Low Frequency Roll-Off | No |
| Dimensions | 7.75 x 3.27 x 2.40" (197 x 83 x 61mm) |
| Weight | 2 lbs 6 oz (1.08 Kg) |