DC Power Supply Cables?

[Zuman]

How much (if any) of a difference does the umbilical make that runs from an external linear dc power supply to a turntable or other device?
I've tried looking online for cables with a GX16/2 (two-pin screw-on) connector on one end and a 2.1mm barrel connector on the other (also a GX16/2 to 2.5mm cable), but most of the results are eBay imports. Even worse (I think), rather than terminating one end with an actual 2.1mm or 2.5mm plug, most of them employ a 2.1/2.5mm hybrid plug that uses a thin spring wire to press against the center pin of the receiving jack on the component.
I'd also like confidence that the cable is well-shielded (assuming shielding is important even when running 12V or 19V DC).
I don't know enough theory to be certain that this is an actual thing to be concerned about, but I don't feel good about having an expensive LPS on one end, an expensive component at the other, and a $5 cable-and-connector combination bringing them together.

 

[jadedavid]

I have used an upgraded DC cable between the power supply and control unit on both my Supratek and Cary preamplifers with noticeable audible improvements.
The one I used was from Revelation Audio Labs.
Might check with them about your needs and concerns on the cable construction.

 

[audiobomber]

DC cable upgrades made an easily audible improvement with my digital gear; switches, streamer, DAC. StarQuad construction is recommended for its superior noise rejection. I tried Canare and Gotham StarQuad cables from Ghent Audio and recommend this one. Drop down menus allow you to select length and terminations:

DC-GAC4 --- Gotham GAC-4/1 11301 UltraPro Star Quad DC Cable(JSSG360)

Gotham GAC-4/1 11301 UltraPro Star Quad, OD 8.8mm Pre-built JSSG360 dual-shielding inside

ghentaudio.com

Some technical info from John Swenson:

DIY DC power cables

There has been a lot of posts recently in other threads about making your own DC cables for LPS-1, JS-2, Y adapters etc. I'm going to attempt to give some theory behind DC cables and CA and some hints for making your own, and some results of my own experience. So what is the big deal, DC is, well...

audiophilestyle.com

 

[MarkusBarkus]

...I have also used custom cables from Audiosensibility in Canada. Good work. Reasonable prices.

Email: sales@audiosensibility.com
Phone: 416-953-8898
WhatsApp: 416-953-8898

Interconnects (OCC copper + OCC silver) - Audio Sensibility

 

[hogen]

I have a NordOst Tyr 2 DC power cable for Burmester 077 for sale if anybody is interested (sold the preamp).

 

[Zuman]

Thanks, everyone. This is EXCELLENT feedback and information! What a joy to see responses like these instead of "You must be a moron for not understanding that your DC cable should be budgeted at 89.7% of your LPS cost" or "You must be an idiot for not understanding that for DC voltages between 0.14V and 21.6V cable composition, structure, and length are completely irrelevant!"