Speedskater

At 4 meters and longer, Blue Jeans Cable is at the top of the list. But there are other coax contenders. Any coax with a heavy braided shield would be great. Like Canare LV-77S, Belden 1505F & Belden 1695A .

From Stereophile: https://www.stereophile.com/solidpreamps/607dart/index.html It's a ridiculously priced pre-amp with RCA, BNC and XLR outputs. That's both unbalanced/single ended and balanced outputs. "Jackie's" question is about each unit's internal circuit. A balanced or single-ended internal circuit is a design engineering decision. A balanced circuit is a challenging & expensive design and on it's own, it's not a better path. * * * * * * * * * * * * * Summary: Balanced interconnects are great. Balanced internal circuits are just another circuit design.

It's a must read excellent new paper by John Siau at Benchmark!

Most Authority's Having Jurisdiction require safety listings of all AC power cords and cables. The above cord is a poor and expensive choice. Just get some shielded Belden cable, and be done with it.

I would think the opposite. Is there a limitation with your Benchmark?

Looks like a reasonable construction. They should be OK.

More likely the audible differences are due to a combination of the following: 1] AC power wired as a "Separately Derived System" 2] very low impedance 'Safety Ground/Protective Earth' circuit. 3] Isolation from noise currents in other circuits. 4] and maybe reduced Bill Whitlock "Conduit Transformer" effect noise.

Almost no audio components take advantage of a balanced AC supply. Because power transformers are wound a asymmetrically with relationship to the component's chassis. In fact many well designed components take care to correctly connect their power transformer.

For power ON experiments, don't use your good loudspeakers. XLR interconnects will probably by OK. RCA interconnects maybe not. * * * * * * * * * * * * * * * * For A/B testing, first become familiar with both products. Then go to rapid switching.

Note: Kalman Rubinson Professor Emeritus of Neuroscience and Physiology at New York University School of Medicine This is his area of expertise.

The wattage ratings from many UPS or DC supplies is into a resistive load. Audio power amps draw current in very brief pulses. So a 700 Watt UPS or DC supply may be only able to supply 400 Watts to the amp.

I couldn't find the post that describes the test setup, but the chart still looks wrong. Heck in pro concert hall recording, 300 to 500 foot cables are common. In a modern interconnect system with a 200 Ohm output impedance an a 20 kOhm load. The chart looks more like 1000 to 2000 foot cables.

That chart looks way, way wrong!

That post is a decade old!

Hopefully there is no analog signal above about 40 kilohertz! Anything higher is distortion, ringing or interference. Sometimes these high frequency problems can cause IM distortion in the audible range. But the higher frequencies carried by an AES digital interconnect cable are in the 10 to 20 megahertz range.