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RE: Change the input Z....

It states the input impedance as 11.1kohm here on the Rotel spec site.

As for raising the input Z just by changing the resistor, this is fine if the input transistors are fet. If they are bi-polar then there could be trouble with dc offset.

http://www.rotel.com/NA/products/ProductDetails.htm?Id=5&Tab=2&Pic=1

Cheers George

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