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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#:~:text=Generally%20the%20input%20impedance%20to%20an%20audio%20amplifier,specification%2C%20you%20are%20taking%20something%20of%20a%20gamble.
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/
2016-08-02 12:59 pm. #4. 2016-08-02 12:59 pm. #4. Input impedance is the impedance seen at the input of an item (could be a single stage or a whole piece of equipment). It forms a potential divider with the output impedance of whatever comes before it. Normally in audio we want input impedances to be significantly greater than output impedances ...
Impedance Matching of Audio Components
http://hyperphysics.phy-astr.gsu.edu/hbase/Audio/imped.html
But modern audio amplifiers are active control devices, and the impedance matching of the amplifier to the loudspeaker is no longer considered best practice. Modern solid state amplifiers are sometimes referred to as "bridging" devices which take an input voltage from an audio source and form an amplified image of that voltage at the output.
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