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Amplifiers & Impedance - Learn About Electronics
https://www.learnabout-electronics.org/Amplifiers/amplifiers43.php#:~:text=The%20input%20impedance%20of%20the%20circuit%20is%20high%2C,this%20shunting%20effect%20can%20be%20reduced%20by%20%E2%80%98Bootstrapping%E2%80%99.
Is there any standard for the input impedance of an audio ...
https://electronics.stackexchange.com/questions/342975/is-there-any-standard-for-the-input-impedance-of-an-audio-amplifier
Generally the input impedance to an audio amplifier is 'high'. That is, high enough to be driven comfortably by any audio source output. But of course, without a proper specification, you are taking something of a gamble. 10k to 100k is the usual sort of range we find, though some can be less.
Amp INPUT impedance | diyAudio
https://www.diyaudio.com/community/threads/amp-input-impedance.294984/
What do you mean by the input impedance is greater than 4k?CD players produce an average of 2 - 3 volts signal. Please check your figures. If the output of the source has an impedance of 10k then it will run into an input load of 10k or greater. Most amplifiers are set at 18k or higher. •••
Impedance Matching of Audio Components
http://hyperphysics.phy-astr.gsu.edu/hbase/Audio/imped.html
For a microphone impedance Ri= Ω. and a preamp input impedance of RL=Ω. the signal loss would be dB. As long as the microphone has enough signal strength to provide the minimum signal input to the mixer, it can be an advantage to connect a low impedance microphone to a moderately higher impedance input.
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