Preamp or power amp has more impact to resolution?

Agree with the above; that said I have found many more amps that I liked than preamps. It would appear that amp design is better understood than preamp design or else companies spend more time on their amps. Just my experience.

The detail or resolution needs to be picked up at the source before the pre-amp can amplify it and then the amplifier to amplify it yet again. So IMO it really starts at the source because you can't amplify what isn't there to begin with.

Chuck

Chuck is right, if the source and preamp are unable to deliver the goods there is nothing you can do about it downstream.

If the source and preamp are unable to deliver the goods there is nothing you can do about it downstream.

On the other hand, if the power amp or speakers or room acoustics are limiting the resolution of the system, you can't do anything about it upstream.

I don't think there is a generally applicable answer to the question. It depends on the specific components, and which of them is the weakest link. Audiojan makes an excellent point, also.

Best regards,
-- Al