Just in case folks haven't seen it, here is my home-made signal grounding system:
It's wires are connected at the component end to the negative (-) leg of the RCA plug. This plug goes on an unused RCA jack on my pre or DAC (could also be phono stage). The other end is connected to a copper split bolt, and the nut is tightened down on the wires. The bolt just hangs in the air over the edge of my audio rack.
It took all of seconds to hear the improvement: this grounding "embodiment" seem to makes music sound notably more...natural, lifelike, and involving. There's also increase in "perceived loudness".
Cost? About $6. 
I call it "Usain".
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Lumin P1 streamer/DAC/preamp, Constellation Inspiration integrated TT: Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion, EAR324. Harbeth 30.2s, REL R-305, Shunyata Alpha V2 ICs, Alpha V2 SPs, Sigma XC, Sigma NRv2, Omega QR-s & Alpha NRv2 PCs, segmented Altaira SG stack w/ Alpha & Omega CGCs, Everest 8000 PD. Remote Server Room: Uptone EtherREGEN, AfterDark Master Clock & LPS, Alita, Battle Angel, (Akasa NUC Roon Core), iFi DC Purifiers (for SMPS used for Alita & router), Shunyata Gemini combo power distributor & Altaira-type CG GP-NR hub, Venom & Alpha CGCs, Shunyata NRv14 power cords for digital components.
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