Who knows what is occurring with external clocks working in conjunction with internal clocks…a lot of the decriers don’t even realise that a number of DACs run a PLL between internal and and external clocks…many think the internal clock is disabled…this is not the case.
My experience with an external clock is that there’s can be a considerable uplift in SQ, some of which is around soundstage, there are other areas too.
An important factor is the cable, a poor cable will wreck the clock signal…I’m pretty darned ambivalent about cables generally but in the case of an external clock the type cable and its connectors are significant. This isn’t too surprising and carrying something like a 10MHz signal is going to need good impedance matching and shielding.
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