HiDiamond Power cords...

Ozzy, off topic re HD power cords but have you tried plugged everything into that P10?

Currently I am using Audience powerChord e for my tube monoblocks and, planning ahead the upgrade, would anyone suggest that the P3 is better than Audience powerChord SE?

As for HD, having a full loom of CT1E High Fidelity, I miss some of the density I used to hear with PAD Venustas so may try out a pair of D8 speaker cables. In my main system, the HF CT1E digital was way better than the HD digital reference. I never had the D9 IC to compare with the CT1E IC (RCA).

Kzhtoo, while I totally agree that power (cords) makes the biggest impact - always put the best one between the wall and the power conditioner - I would advice in your case to upgrade the HD dig ref to, e.g. High Fidelity Cable CT1E or CT1U digital (note HFC only has RCA jacks) as you can amplify only what comes from the source. I have had the HD dig ref but the HFC is in a different league for digital signal transmission.
The HD D8 SC is wonderful and as you can see in my system, displaced the HFC CT1E SC.

Can someone inform me if the 3m HD P4 sounds better than the 2m version?

Kzhtoo, I am pretty sure the HD D8 is a big step up from the NordOst Frey (is that what you use currently?). Not familiar with the Frey but having (had) Valhalla IC, some mid range NordOst SC and still a bunch of Valhalla PC which is IME the fastest kid in town, the D8 will nicely complement the P4s.

Tympani, I am very tempted to buy more P4s but will do so after a shoot out with LessLoss DFPC Ref that I just bought and maybe a Silent Source Musical Ref. Did you try any of the above mentioned ones?