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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: udovdh on May 24, 2006, 02:21:25 PM

Title: How can this be understood? (Sennheiser question)
Post by: udovdh on May 24, 2006, 02:21:25 PM

Sennheiser specs for the MM-HLSC-1's (mke40's) a minimum terminating impedance of 15K.
In the elec-wire PDF they specify a batterybox resistor of 8K2.
So how can this info be combined to truth if the batterybox resisor and line in impedance of the recorder must be seen as two resistors in parallel for the mic?  ???

Title: Re: How can this be understood? (Sennheiser question)
Post by: Church-Audio on May 24, 2006, 10:18:51 PM

Dude the battery box resistor is not what determines input impedance of the battery box it just controls the bias voltage the capsule sees.

Chris Church

Quote from: udovdh on May 24, 2006, 02:21:25 PM

Sennheiser specs for the MM-HLSC-1's (mke40's) a minimum terminating impedance of 15K.
In the elec-wire PDF they specify a batterybox resistor of 8K2.
So how can this info be combined to truth if the batterybox resisor and line in impedance of the recorder must be seen as two resistors in parallel for the mic?  ???

Title: Re: How can this be understood? (Sennheiser question)
Post by: udovdh on May 25, 2006, 03:09:49 AM

Quote from: Church-Audio on May 24, 2006, 10:18:51 PM

Dude the battery box resistor is not what determines input impedance of the battery box it just controls the bias voltage the capsule sees.

Yes indeed (for the bias), but several people around me say that both the impedance of the deck and the batterybox resistor determine the impedance that the mic sees.
If that is so the situation is strange.