It can vary in each case. Try both ways and determine for yourself. Its the only reliable way. Pre-amp to amp should affect all input sources similarly if you have more than one whereas source to pre-amp only that source. You have to decide which is best for you in your case.
One entry-level IC, one really good IC.
I've got one entry-level IC, and another from the same manufacturer that's several steps up. I can put the better IC between the source and the pre-amp, or between the pre-amp and the amp. Any thoughts as to which configuration is preferable? Thanks in advance.