Hi Grateful - this question will draw lots of different opinions so I will offer mine. I think the more revealing cable should go between preamp and amp depending on a variety of factors. First, the resolving quality of the pre and amp, if it is a budget system or more politely stated bang for the buck system, the better cable may need to go source to pre. But if you have a really revealing system then from my experience pre to amp, they need to be synergized totally to optimally pass the information along through the amp stage and bring out the best of the preamp and amp. Every cable in the chain has to synergize so the source connection shouldn't be a slouch either. I'm of the opinion that the preamp is the component that will affect the sound the most.