Preamp or power amp has more impact to resolution?

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

Thanks for all inputs,
To be honest my system has a bit of strange combination to some.
I am using TW Acoustic Raven with Ortofon AS212 and Lyra Delos for analog front end while digital front end is Sony XA9000ES. My preamp is Audionote M7 and amp is Lavardin A80, speakers is Totem Forrest.

I have talked to some friends and they suggested if I can only change one to increase resolution it would be the preamp.

I read somewhere about wide bandwidth power amp, does it mean that power amp with wide bandwidth will have more resolution?

Replace your weakest link(s) and that will be your best investment.

I believe your amp is your limiting factor just not enough power to drive your speakers properly. Good Luck.