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Xfinity X1 CATV box DC umbilical project










Among other issues, my new Xfinity X1 DVR CATV box features an outboard switch-mode 12 volt DC power supply. When compared with the performance level of a high-performance regulated linear power supply, the presentation sounds sterile and too aggressive via the switch-mode PSU, without subtle listening cues to appreciate, not to mention a level of unacceptable switch-mode power supply pollution within the rest of my audio system. Taking advantage of an otherwise unfortunate audio configuration has always been a key factor as it applies to DIY modification projects, so a 12 volt DC input jack can be an opportunity for sonic betterment, and in this case it's been a worthwhile audiophile experiment.

I found a Newmar 115-12-6E 3.5A regulated linear power supply intended for high-end marine communication and navigation purposes within my audio gear collection to perform substantially better than the stock switch-mode power supply, and the barrier spade outputs of the 115-12-6E PSU makes it easy to build custom DC umbilical builds, along with a Switchcraft 762 2.1mm ID DC barrel connector terminated at the load end of the cable for this upcoming DIY cable project. While the Switchcraft 762 is not on par with a SOTA Oyaide DC connector, it's considerably better than a sub par, too fragile Radio Shack DC plug, IME.

Other than two other DIY experiments based on 16 AWG and 18 AWG mil-spec twisted pair wires, the next DIY project will be constructed with a 2 foot length of Connex BL-Ag solid core silver with foamed Teflon dielectric and foil shielded cable for use with the 3A rated device. The Connex BL-Ag is a custom-made by DH Labs interconnect cable for Parts ConneXion priced at 50% off at this time, which makes it a very affordable choice for a non-critical listening, but still-worthy DIY audiophile cable project.

Note: The following voltage drop calculator result indicates a 2 foot, 23 AWG pure silver conductor cable provides a less-than 2% voltage drop for a 12V DC 3A load, which is a fine figure to expect for a DC power supply application:

http://www.calculator.net/voltage-drop-calculator.html

I plan to post an AA report down the road, along with other details about the particular application.

See link:



Edits: 09/20/16

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Topic - Xfinity X1 CATV box DC umbilical project - Duster 20:40:53 09/16/16 (14)

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