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Custum R2R doesn't necessarily mean poor measurements. JA of Stereophile found the Holo Audio Spring performing acceptably well. The important thing of note here is that Metrum DACs don't have digital filters aka NOS with all the implications, and them being NOS is likely mainly why they will measure worse than oversampling designs, DS including. You can run with external digital filtering, eg the HQ Player, and this would be a very interesting test indeed to see how good Metrum DAC modules are when they are pushed to the limit