Speaker cable gauge and amplifier power


Based on my limited understanding of electricity, sending electricity through a wire is like sending water through a pipe. Using a larger cable gauge or bi-wiring will increase the amount of current required from the amplifier.

It seems like there must be a way to optimize speaker cable gauge and length based on an amp's current and watt ratings. Lower powered amps would mate best with narrower gauge speaker wire, and a powerful amp would benefit from thicker wire.

Am I oversimplifying, or are there established guidelines based on calculations of current, capacitance, etc.?
jpbach

Showing 1 response by amandarae

The resistance of a conductor depends on the length use and the cross sectional area. More precisely, it is computed this way: R=p(l/a)
p=resistivity of the material(ie. a constant for copper, silver, etc.)
l=length
a=cross sectional area

In theory, if the length is short and the cross sectional area is large, the resistance comes out low.

In audio, the response of the resistance value of speaker cables are greatly enhanced, reduced, or in general influenced by the interaction of their characteristic impedance(because we are talking AC) to that of the passive crossover use which can result in either purely resistive (preferable), inductive, or capacitive in nature.

IMO, this is the reason why we hear difference in wires and nothing else. Unless of course you can teach electrons where to go and what to avoid.

In the end, no one can tell you what will suit your ears better. If measurements is the bread and butter, then the shorter the wire and the bigger the cross sectional area the lower the resistance of a wire which leaves the cable electrical parameters negligible and the speaker crossover to be the one who dictates the nature of the impedance seen by the amp.