Chris, I distinguish modifiers from general DIYers in this regard. A modifier has the opportunity to start with a stock component & control variables by making small incremental changes. After 10 or so such changes to a component the ear has received an education as a test instrument. The non-DIYer audiophile has only the opportunity to swap whole components. This brings in a wider range of variables between models & manufacturers to complicate comparisons. It is more difficult to evaluate component A relative to component B, than it is to evaluate component A relative to component A with mod B. The modifier is simply extending the R&D of the original designer, freed from the constraints of development cycles & costs.