01-10-2016, 11:28 AM
What a curious microphone!
It's available in 4 different output impedances - 25, 200, 600 and 50,000 ohms. Looking at the datasheet (attached), the output varies according to impedance, suggesting a range of different matching transformers between the moving coil dynamic capsule and the output connector. The high-impedance version is presumably for situations where there is inadequate voltage gain. The 200 ohm version is much more like what you'd expect to find today from a dynamic microphone. Perhaps hi-Z microphones were common domestically, but they're certainly a rarity in professional circles.
So, if the 50k version was in use, then yes, cable capacitance might well alter the HF response. But, the 75 ohm coax should have had less effect than the other microphone cables if our quick survey of cable types is any indication, so it still feels like something else was amiss with that cable...
Looking at the frequency response, a bit of HF loss in the cable would probably be quite welcome
It's available in 4 different output impedances - 25, 200, 600 and 50,000 ohms. Looking at the datasheet (attached), the output varies according to impedance, suggesting a range of different matching transformers between the moving coil dynamic capsule and the output connector. The high-impedance version is presumably for situations where there is inadequate voltage gain. The 200 ohm version is much more like what you'd expect to find today from a dynamic microphone. Perhaps hi-Z microphones were common domestically, but they're certainly a rarity in professional circles.
So, if the 50k version was in use, then yes, cable capacitance might well alter the HF response. But, the 75 ohm coax should have had less effect than the other microphone cables if our quick survey of cable types is any indication, so it still feels like something else was amiss with that cable...
Looking at the frequency response, a bit of HF loss in the cable would probably be quite welcome
