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In Reply to: RE: Volume Control Impedance Rating posted by j_barry on August 12, 2014 at 07:47:40
There is almost never a situation where a 50k attenuator could not replace a 100k attenuator without problems.
You can lower resistance of a pot by strapping a resistor between input and ground, increasing the resistance will have you putting a resistor in series with the pot either on the input or ground lugs of the pot. If you put the resistor in series before the input lug, you will lower the wide open signal by 3db. If you put the resistor between the ground lug and ground you will not be able to fully mute.
Follow Ups:
If you put a 50K resistor on top of a 50K pot you will get attenuation from -6dB to off. If you put it in the ground leg you will only get attenuation from 0dB to -6dB
dave
If there is a balance control wired in conjunction with the volume pot, then the impedance can be an issue.
Even with a balance control, moving from 50K to 25K input impedance would not be noticeable in terms of losing high frequency in a typical home setup. Most passives have a 10K input impedance.
There are some implementations (I just ran into this), where changing the impedance of the volume control can effect the overall function of the balance control in conjunction with the volume pot.
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