Tubulus Argentus DB-25 Cable V2
1 Meter (2 available)
Description: Provides an upgraded power umbilical cable for use between the outboard power supply and main chassis of Pass Labs XP-20 preamplifier, Pass Labs XP-30 preamplifier, Pass Labs XP-25 phono preamp, McIntosh C500 and C110 preamps, Resolution Audio Opus 21, Spectral SDR-2000 processor, or any equipment using the DB-25 style (25-pin D-Sub) connector.  
Review quote: “…The soundstage has become even more three-dimensional than before due to the many small details you get aware of now. The music often makes me want to close my eyes, my feet can’t keep from moving with the rhythm, emotions are created, sending shivers down my spine….”
Orig. Price $579 each  Asking Price $300 each or OBO.  Paypal add 3/5% or use F/F. 
Purchased in December 2021.  Used less than 1 month.  Swapped for different length.
MFG comments:
https://www.tubulus.net/product/tubulus-argentus-db-25-cable/
TUBULUS cables are hand crafted with love, expertise and devotion with no excess decoration or luxury packaging and therefore true value for your money!
The TUBULUS Argentus DB-25 Cable V2 is an umbilical cable based on high quality silvered copper conductors. These are solid core conductors to prevent strand interaction, which is a major source of distortion.
The silvered conductors are surrounded by mainly air, because (except for a vacuum) air is the best dielectric. This air insulation is made possible by our tube construction, which can only be made by hand.
The TUBULUS Argentus DB-25 Cable V2 is also equipped with foil and a very thick copper shielding to prevent electrical noise entering the umbilical cable. To complete this shielding the DB-25 cable V2 is finished with high quality aluminum plugs so that a 100% coverage is guaranteed.