shindo aurieges output impedance and other preamps

What should be the optimal input impedance of the amp for a 5k Ohm preamp output? At least 10 times as much, so at least 50 kOhm, as often recommended?

Yes, if the preamp output impedance is truly 5K. However, as indicated in the post I linked to above, it may actually be much lower.

Best regards,
-- Al

thanks for the good words
I'm waiting a Supratek Chard

The lower priced Shindo preamps as Aurieges and (at least older) Monbrison have 5k Ohm output, the Masseto, Vosne Romanee have 600 Ohm outputs.

What should be the optimal input impedance of the amp for a 5k Ohm preamp output? At least 10 times as much, so at least 50 kOhm, as often recommended?

I have no knowledge of how true it may be, but according to this post, "Actually the Shindo pre-amps all have a very low output impedance. The numbers often seen in their specs is the lowest possible input impedance of the partnering amplifier." You should probably check that with the manufacturer or distributor.

If the output impedance is truly 5K, it would be an acceptable match only if two conditions are satisfied:

1)The output impedance is essentially flat with frequency. That is unlikely to be the case if a coupling capacitor is used at the output, which would typically cause the output impedance to rise substantially at deep bass frequencies, resulting in rolloff of those frequencies.

2)The length of the interconnect cable is short, and the cable has low capacitance per unit length. Otherwise the upper treble will be rolled off to some degree. That would occur regardless of power amp input impedance, as it is due to the interaction of high preamp output impedance with cable capacitance.

Regards,
-- Al