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Impedance matching of pre & amp


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Question for the technically literate: I know a ratio of 5:1 ratio of pre to amp impedance is acceptable and 10:1 is "preferred." What might happen with a pre's output impedance of 100 Ohms connected to an amp with an input impedance of 100K Ohms? These are both tubed, BTW. Is this something I should care about?

 

Thanks in advance.

 

Mike

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2 hours ago, michaelwjones said:

Question for the technically literate: I know a ratio of 5:1 ratio of pre to amp impedance is acceptable and 10:1 is "preferred." What might happen with a pre's output impedance of 100 Ohms connected to an amp with an input impedance of 100K Ohms? These are both tubed, BTW. Is this something I should care about?

 

Thanks in advance.

 

Mike

 

Higher Impedance Ratios are fine and if anything the noise floor of the system due to the preamp to amp impedance ratio might be slightly improved.

 

The issue with lower impedance ratios is the possibility that the preamp want have enough current drive capability for lower amplifier input impedances.

 

miketn

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In audio pre amps to power amps or any line level output to input for that matter we are trying to get maximum voltage transfer. This means the lower the driving impedance and the higher the load impedance the better. There are practical limits of course in real world devices.

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