The typical 12AWG zip cord has about 3.4 mohms of loop resistance per foot. The major relevancy roles of the dielectric in this application are to serve as isolation between the two conductors and control the capacitance of the cable based on the conductor spacing and dielectric constant. G represents conductance ( 1 / Rdielectric). Parallel Capacitance (pF) measured tip to tip at one end of the cable while the other end is open circuited. Check out our article on Cable Inductance for more info.
Series Inductance (uH) measured tip to tip at one end of the cable while the other end is shorted. Note: Rs = Rac + Rdc (minus instrumentation inaccuracies identified below) Total Series Resistance (mohms) measured tip to tip at one end of the cable while the other end is shorted. The resistive portion of the cables series resistance as a function of frequency due to skin effect.
RLC Lumped Schematic Diagram for a Speaker CableĬommonly referred to DCR which is the series resistance of a cable at zero frequency. Below is a basic lumped model for one foot of speaker cable. The RLC losses in speaker cables matter, especially the resistive (R) losses. So what does matter in speaker cables? Watch the following related YouTube video discussion before continuing reading this article.ĭiscussion on Choosing the Right Speaker Cables In our article on Debunking the Myth of Dielectric Absorption in Cables we learned that even conservatively considering transmission line effects on cables up to 100kHz ( 5 times the audio bandwidth ) with 1/10 wave approximation, it would take a cable of over 980 feet to become relevant! At that point, the RLC losses alone of a typical 12AWG zip cord cable would attribute to over 12dB of attenuation of the upper frequencies, not to mention over 3dB of insertion loss due to cable resistance alone! They often go one step further and misapply transmission line relevancy at audio frequencies.
They are often misinformed by exotic cable vendors or cable forum cult hobbyists that cable lengths need to be kept identical to a void amplitude or phase/time delay differences between the two. Folks often wonder if the cable length between the main front channels need to be identical or close to identical. More often than not, I see the common question pop up in our forums regarding speaker cable length differences between two or more speakers. The Claim: "Your cable lengths between speakers should be as close to the same as possible."
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