I find the Puritan very interesting in terms of price and not that overpriced. The grounding option seems nice too. Last week I was at a hi-fi magazine event at my dealer where the topic was power supply. Various filters were demonstrated. Audioquest 3000, 5000, 8000. Or is it called 7000? For phono, a separation filter from Plixier or something similar. Finally, a progressive audio powerhouse. The whole thing was wired with Audioquest Dragon and Firebird power cables. Whether that was optimal to clearly show differences remains an open question. In my experience, power cables, especially the Storm series, bring a lot of peace and quiet. Differences could be heard. Itās a shame there wasnāt a Puritan in comparison. Grounding and ground boxes are also unknown to most people. The general publicās conclusion was that the Audioquest 5000 was not worth it because the advantage over the 3000 was too small. For Phono, a clear difference in blackness could be heard with the Plixir. Since the gain factor is the highest in phono, most of the interference is also amplified and a filter probably helps the most. The big difference was made by the power conditioner from Progressive Audio, which sounded significantly clearer, larger and more dynamic than all Audioquest filters.
Very nice looking pieces. Whether they improve the sound or not they will add a quality look to the system.
A friend swears by them and has the complete set.
Oh I should mention I use the middle sized CAD ground control system in my main Rig. It is connected to my Preamp, Grimm MU1, and whatever BACCH system I am using. It has a couple of empty ports. Should I connect my DAC as well? And what of this business of using multiple ground devices for different sources?
It seems like grounding my Tinfoil Hat might be helpful as well. Hmmmmm.
It looks like a work of art. For a hard coupling, all you have to do is cut away the carpet underneath. 
If there is a concrete floor underneath, the spikes could also puncture the carpet.
I would put a suitable thick granite slab underneath. A concrete patio slab could also work.
Donald and Luca have probably experimented the most with grounding.
They seem to be convinced by the Puritan Groundmaster. Maybe I should also try grounding my listening chair via a free connection.
Iām wondering if the MU2 can outperform (if it makes sense) the MU1 used only as a streamer, I mean using it with another DAC (Tambaqui or whatelse).
If I had to upgrade my Innuos Statement Iād like to consider:
Wadax (canāt and will never can afford it)
Taiko
Pink Faun
Grimm
Antipodes
The bigger GC3 CAD can manage signal and earth ground at the same time, as per Scott (not so the little brother GC1). I use one GC1 for each component.
I strongly suggest to try it plugged to digital sources (that always have signal and earth ground connected) AND to a ground lug of a conditioner.
As for P20 you need to find a grounding point unscrewing a screw or similar (if I remember well it has a right point for that purpose).
The Puritan 156 has a ground lug.
You can also try the inexpensive GroundMaster City, it is plugged into a wall socket and on the other end it sports a ground lug where you can connect a CAD cable from the GC3 (spade or 4mm standard termination).
Honestly I prefer CAD products in general for grounding, they really work and you notice the difference when you remove them. So I found the little City plug-in ground filter not a big deal.
Butā¦ butā¦ a CAD GC connected (to digital sources) AND to the Puritan or to the City, sounds very nice. In terms of profound silence, quietness, naturalness and calm.
Hope that helps.
Using CADs I never tried the Puritan hub, called ROUTEMaster.
I just came across two little helpers that interest me. Does anyone know her?
iFi Audio DC Blocker und GND Defender
Tried both of them! Didnāt do anything in my system. Buy them on Amazon, so you can send them back easily without costs.
I can vouch for the maxed out version of the Pink Faun 2.16x and it is a rock solid, dead quiet, very well mannered beast. Set it and forget it.
I dont know about the newest version but it couldnāt be worse. 
I would assume that coming from the same neighborhood as the MU2 there would not be a bad choice to make between the two. It would really depend on if you need another preamp in the system?
Thank you Luca for your answer and tip. What havenāt you tried yet?
I think a Puritan with grounding and something like the CAD groundboxes could be interesting for my system in the future.
Oh, BACCH and Headphones despite @aangen and @vkennedy61 recommendations. Time will tellā¦
P15 and PSM-156 are designed with different concepts, and both are effective in doing their things. If I had to describe their differences and strengths, it really comes down to balancing quietness and warmth (Iām oversimplified her for sure). Both Luca and I like DAC with Puritan, but with a different system (Grimm?) that may not work. I believe power conditioners and regulators all have their unique house sound, so there is no surprise that different systems will get different results.
Luca has experience in trying both CAD and Puritan GM/City systems, and based on his evaluation the CAD system is more effective in providing additional quietness and smoothness (again, simplified here). There are many great reviews on CAD (SR grounding device too), and with their much higher prices this makes sense.
I did not think grounding devices could make that much difference, and I did not realize their cumulated effect either. I have a full loom of Puritian GroundMaster/RouteMaster/City setup and I can give an assessment. If their total effectiveness is 100%, one City with PSM-156 gives 30%, one City with RM (plus 3 cables came with it) gives 20% (or less depending on components used). But with two City units plus 9 cables connecting to all my components, the accumulated effect is astounding.
I believe this will be the same with CADs or other higher end of grounding systems. In fact, they probably are more effective.
Oh, No! Maybe you can give us another ātruthā from an amateurās point of view. 
Pulled off all my room acoustics in preparation for a paint job. What an acoustic mess! Tons of reverb, no precision in imaging and soundstage wanders. All for a slightly different color palette Bahahaha
Itās not like you canāt go back.
Saved for future viewing, but 20:35 to sum up a comparison. Iād rather spin a record, which is what Iām doing at he moment.
True true. Just sharing is all. I will also be revisiting placement options of the panels since itās all off for now.
I am an early adopter of regenerated power but late to the party on dedicated grounding. Years back I evaluated Shunyata Denali filters vs. PSA 15 and 20. I was gobsmacked with the quiet presentation of the SR, but on longer listen thought it came at the expense of detail and dynamics. I kept the P20 and never looked back. Maybe the Puritan has squashed my concerns with filters and I might try it sometime. But, I think getting something like the CAD could at least get my grounding act together. I appreciate you, Al, Luca, and others, have dug a new, but productive, rabbit hole here.
With an MU2 en route as well, it will be interesting to see whether a streamer/DAC/Pre combo can compete with separates like the MU2/Tambaqui combo. Both are very different designs by very competent designers and characteristically have very different presentations. I wager that it will come down more to taste and system/room capability, than an outright claim than is ābetter in all waysā than the other. Such blanket statements scare me. Dealers with lines to support are inherently biased as well.
The proof of the pudding is in the taste. Consider you are fortunate to be at the table with all the offerings.