I could try this test using the volume control on my Oppo BDP-105 to play digital media and files. This seems to be a good way to estimate the sonic signature of the 38s.
I want to stay analog all the way with my other sources - a tuner and two cartridges - so I will only use the above for testing. I need a control amp to select the different analog and digital sources. After the preamp, my system is all analog (EQ, crossover and speakers). The only digital components are the Oppo and the BDA-3.