Dantheman06
New member
On some forum I was told that I could build an attenuator using 3 resistors in an H configuration. One resistor will be between lines 2 and 3 and the 2 others (2 identical ones) will be on line 2 and 3. This is how I understand the H configuration. I have 2 questions:
1- How could it work with condensers mic? I think that it will drop the phantom voltage, especially if the condenser mic draws a significant current.
2- According to the user guide for the Shure A15AS in-line attenuator, the input impedance is much higher than the output impedance. How is this possible if it is built using only resistors???
From the user guide:
Impedance: Input (XLR Female): 1,000 Ohm; Output (XLR Male): 150 Ohm
Attenuation (switch selectable) 15 dB, 20 dB, or 25 dB
NOTE: The equivalent single series simplex-powering resistance
is 215 Ohm; this resistance should be considered in addition to any
existing circuit resistance when using the attenuator.
see: http://cdn.shure.com/user_guide/upload/611/us_pro_a15as_ug.pdf
Thank you for your help,
1- How could it work with condensers mic? I think that it will drop the phantom voltage, especially if the condenser mic draws a significant current.
2- According to the user guide for the Shure A15AS in-line attenuator, the input impedance is much higher than the output impedance. How is this possible if it is built using only resistors???
From the user guide:
Impedance: Input (XLR Female): 1,000 Ohm; Output (XLR Male): 150 Ohm
Attenuation (switch selectable) 15 dB, 20 dB, or 25 dB
NOTE: The equivalent single series simplex-powering resistance
is 215 Ohm; this resistance should be considered in addition to any
existing circuit resistance when using the attenuator.
see: http://cdn.shure.com/user_guide/upload/611/us_pro_a15as_ug.pdf
Thank you for your help,