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Power amp input impedance question.

Posted by Davy (A) on October 23, 2007 at 08:43:17

Can anyone help me here please?

I was wondering if the input impedance and capacitance of a power amp can alter the sound balance a lot between one amp to another.

I have two NAD power amps. One a 216 THX and the other a 2700 THX.

The 216 sounds a lot fuller to me in the upper/mid bass, - the 2700 is a bit lightweight and brighter. Could this be due to the input impedance? The 216 sounds a lot better balanced to my ears.

The 216 has input impedacne and capacitance of 60K and 500pF respectively whereas the 2700 has 20k and 800pF. Could this account for the differences? I thought it might be due to the older capacitors in the 2700 but I have another 2700 and it sounds the same. Does anyone have any ideas? Are these differences I am hearing due to something else in the amps circuitry?

If this is likely to be the cause of the difference could I add resistors and capacitors to an interconnect lead somewhere when using my 2700 to get a sound balance closer to the 216 I prefer? Anyone know how?

Any help would be really appreciated!
Davy

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