I've borrowed an iFi SPDIF iPurifier. It certainly usefully boosts the SQ of my Octave DAC. I guessed it would be even better with an old Assemblage DAC...more than a decade old. With the iPurifier the Assemblage sounds worse! It's as though the DAC is being exposed as being below today's standards... possibly the receiver?
TT 1 Trans-Fi Salvation with magnetic bearing + Trans-Fi Terminator T3Pro + London Reference
TT 2 Garrard 301 with NWA main bearing + Audiomods Series Six 10.5" + Ortofon 2M Mono SE
Digital Lindemann Bridge + Gustard R26 with LB external clock
Pre and Power Amp EWA M40P + M40A
Bass Amp & DSP Behringer iNuke NU3000DSP x 2
Speakers 1 Bastanis Sagarmatha Duo with twin baffleless 15" bass drivers per side
Speakers 2 MarkaudioSota Viotti Tower