@Elk - thanks, I had some time on my hands. I just got back from 3 weeks in CA. Leading a RCCA (Root Cause & Corrective Action). Issues with PCB manufacturing a video PCB. Looked like fractured VIAs, now looks like contaminated process. We are getting high impedance shorts between traces. A very cool problem. Using signal tap in FPGA for debug and logic analyzer and scope on persistence mode to identify trace anomalies… I go back this SAT to drive root cause final with our M&P (Materials & Process) team performing PCB DPA (Destructive Physical Analysis) to pull artifacts for PCB house to analyze their process. The PCB is a double sided 26 layer board with blind VIAs and a lot of components (~2,000). Caught this issue from decoder to FPGA. We coded up the FPGA controlling the video switch matrix steering the video through another decoder to exonerate the VHDL code… this is a fun RCCA… manufacturing PCB this complex is an art. There are many chemical process and mechanical & laser drilling is tricky stuff…
Nothing as unpredictable as ground systems, difficult subject indeed.
@Rudolf_Appel - yeah - I come from the “buy it and try it” group, instead of the “talk it to death” group. In this case, no affect. All good, I can use another GND to the DSD from DMP… all good, no down side… just $75 and a few hrs spent adding my uniqueness to the hive…
Unless you are very experienced, like engineering ground systems is your daily work, you might have an suggestion from experience, for most grounding is trial and error.
Thank you for trusting me and doing this test. I’m sorry you feel disappointed but I’m not backing down. In my system, an additional cable connecting pin 1 of the XLR connector in DMP with pin 1 of the XLR connector in DSD significantly improves the bass, location of voices and instruments and adds shine to the music.
At home I have a special power supply line for audio equipment.
All power cables are Verastarr Grand Illusion Signature.
In P5, DMP, DSD I have SR Blue fuses.
0.5 m HDMI WW Platinum Starlight cable.
Active 3-way loudspeakers (closed enclosure weighing approx. 60 kg, the best Scan Speak speakers), each with 6 IsoAcoustics GAIA II isolators.
Analogue crossover 24 dB/oct. 180 Hz, 2700 Hz with an additional filter correcting the range of the lowest frequencies - with correction - 3 dB is at 25 Hz, without correction -3 dB was at 40 Hz. I had a DSP crossover before, the analog crossover sounds much better.
The signal from DSD is connected to the active crossover via Van den Hul MC - The Platinum Hybrid XLR cables.
This strange cube from which the red, blue and black wires come out is a power supply for balanced buffers that lower the output impedance.
No need to.
Every set up is different and an additional cable connection between pieces of equipment may very well improve the sound in your system.
@wiesiek - not a fistfight… 
every system is different. I made sure the GND had plenty of beef and also HF braid. There was zero difference. This is my power distribution… and I have (22) SR BLUE fuses in all my components… and WW P7 USB from N+ to Matrix. I wish it were that I did not pay attention to power, sorry - 
BD System Power
@wiesiek - my BD of my system - no issues, just cost me $75 and a waste of a few hrs of labor…
It is possible that I used the wrong words, but I don’t know English well enough. I didn’t mean to offend anyone, I’m sorry if that happened. I had good intentions, I wanted to popularize a simple solution that significantly improved the sound of my system.
This is the place for such suggestions, I do not see why anyone would be offended 
No offense taken!
I enjoy reading about what works for people. I like your idea.
And your English is excellent
No offense taken, I thought it was cute… All systems are different and I would not have tried it if I didn’t think there was a chance it might help. All suggestions are welcome and this forum participants love new ideas. No harm, no foul. Keep the ideas coming…