I decided to do some frequency response measurements of my shiny new Tone2 Pro this afternoon to see how it compares to my old Tone1. Before I got into comparisons, I wanted to see how different filters affect the response at 48 kHz. On my other DACs with selectable filters, there’s a subtle but significant impact, especially at lower sampling frequencies.
Testing the Tone2 Pro with an input sampling rate of 48 kHz and cycling through all seven filters, I measured EXACTLY the same response for each. That’s a bit troubling. I’m now wondering if the filter selection via the big dial actually works.
I have an S.M.S.L. Sanskrit 10th V2 that also offers different filters. This plot shows how the response differs when different filters are selected:
I expected to see a similar level of differences between filters on the Tone2 Pro