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Gear / Technical Help => Recording Gear => Topic started by: udovdh on January 04, 2006, 11:09:38 AM
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Hello,
After asking recently for the impedance of the Microtrack line in impedance I got an answer:
The 1/4" in impedance is >5.3K Ohms.
How can I interpret this? Bigger than 5300 Ohms, but how big and when or why?
Can someone explain the difference with e.g. the line in spec of a Sony DAT deck? 47K
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Nobody?
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The input impedence will vary with audio frequency, and you might have a problem if the impedence of a nominally "high impedence" input goes too low somewhere in the audio frequency range. So their response, which I'd translate to "it doesn't drop below 5.3K Ohms anywhere in the audio frequency band" is reasonable. Two other manufacturers might well quote input impendences of "5.3K minimum" and just plain "5.3K" to indicate the exact same measurement.
That said, the 47K you quote for a Sony DAT feels like a more normal figure, and the 5.3K feels a little low. Whether it's actually too low depends on what you plug into it. You should check if the preamp or other box you intend to connect to the MT specifies a minimum impedence to which its output should be connected.
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How much variation of the impedance over frequency is normal?
What kind of curve of impedance versus frequency is to be expected?
Does anybody have a graph of impedance versus frequency for the Microtrack's line in?
I know: many questions but I am slowly learning more..
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Unsure of the correlation between frequency & impedence, but on the m1 the 47KOhm impedence for the line-in setting will allow you to plug into a hot feed from a soundboard without brickwalling. I don't run a pre with my rig, so I have to use line transformers to get strong enough levels using the line-in setting. If you plugged into a hot feed with a low impedence recorder, I imagine that you would have to use attenuators to keep from brickwalling. Can you use the 1/4" input jacks on the MT in both a line-in AND mic-in setting? If so, there are probably different impedence values for each setting.
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How does the impedence on this compare to the JB3... I know when running something like CMC-8 > bat box > jb3, you get more distortion that running CMC-8 > bat box > D8....