Preamp or power amp has more impact to resolution?

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.

There is always one (big) thing you can do about preamp/amp resolution downstream...power conditioning. Elizabeth is quite right about that.

Over many years, my experience has been the priority ranking is Linestage first, then Power Amp, then Phono stage. Obviously you don't want to get too far out of balance by, for example, pairing an entry level power amp with a top-of-the-line linestage, but in general the linestage seems to have the greatest impact on overall sound quality. I have had a number of phono stages and power amps that I find quite good sounding, but very few linestages that I have actually liked.