Originally Posted by checker9
I think the focus is not on capacity but resistant.
This posting (mine that is)
is an interesting side note. It does help put speaker wire into perspective, but much like Inductance and Capacitance
considerations, which rarely come into play when using Speaker wire, Current and Power
capability are rarely taken into consideration. Likely this is the first time it has been mentioned in this context.
So, most commonly people will simply take Speaker Wire Losses
into consideration, but there are many approaches to this.
uses a fixed number; wire losses should not exceed 0.1 ohms.
in his often cited chart, uses a fixed 5% -
to expand the perspective, I have calculated various losses (1%, 2%, 3%, and 5%)
for various Gauges and for various Speaker Impedance, and have cited that at the top of this thread.
By all parameters, very common AWG 14ga
wire will serve the need of a vast majority of people in a vast majority of circumstances, and with a very considerable reserve of capacity. 14ga wire at 5% loss is 40ft to 4 ohms and 79ft to 8 ohms. More than enough.
But for most, 14ga is very very reasonably priced, and is more than affordable. So, that's what most people buy.
All these wire have the capacity to deliver the power but the higher gauge will cause the amp to have to deliver more power than the lower gauge.
This last bit is slightly off, but I think most people got your point.
Small high gauge wire will not cause the amp to deliver more power (within a context)
but rather the losses will be higher. More signal will be lost in the wire, and less available to the speaker.
BUT ... even at 5% signal loss, what you actually hear (or don't hear, as you will see)
is very very small. Likely in the range of 0.5db. That is impreceptible by most accounts. Even 10% signal loss is still an inconsequential 1db.
Part of the seeming imbalance is because there is a Square (or log?)
function that makes voltage and perceived sound non-linear.
The common illustration of this is that ±3db is a doubling or halving of the applied power, yet ±3dB is a very small change in the sound you hear. Just barely noticeable.
But, on general principle, I don't want to lose any more of my signal than I absolutely have to. Fortunately at common Stereo Cable length, you are well under 5%. Using my Charts again, for 1% loss to a 4 ohm speaker, you can still use 8 feet of 14ga wire. To a more common 8 ohms speaker, even with a 1% loss target, you can still have 16ft of wire.
The dB, or perceived sound loss, of 1% signal loss is about 0.09dB, which is unimaginable microscopic. (Assuming I am using the right formula)
But in principle you are right in what you say. Resistance per Length
is the practical determining factor. But, it doesn't hurt to have more information and more perspectives on the available choices. Here I have simply presented one more perspective.
Thanks to BILL's encouragement.