Originally Posted by ChrisWiggles
This is absolutely not true at all.
The reason very large gauge wires are inevitably stranded is because it becomes very difficult or impossible to bend large-diameter solid-core wires, and the flex-life of the wire is a serious concern because it will just crack and break if you flex it much.
The skin effect is of no concern at audio frequencies, let alone 60hz line-level power.
Stranded cabling is supposed to take into account the effective cross-section of the actual cable, not the size of the cable, so for power and analog audio where skin effect is not an issue, there really should be no difference between an equivalently gauge wire, except that the stranded cable will be every slightly larger diameter. Sometimes though the diameter is measured instead so in that case the solid-core wire will have slightly greater total crossectional conductor area and be slightly better (less resistance).
Bottom line: use a proper stranded speaker cable for ease of use and avoiding code issues of using something like romex in this kind of application. It should be comparably priced, far more attractive looking, and easier to deal with. Romex is ugly, difficult to deal with, and there really isn't any meaningful benefit to going with a solid-core wire that's going to be a PITA. IF you want more gauge, just get a larger-gauge stranded speaker cable.
Never said it was stranded for the purpose of carring more amperage.. that's only a characteristic.. All 12guage is "rated" for 20amps (even though stranded has the cability to carry more than solid at that diameter the difference is very very small) read my post above that and it clearly states that below 8 guage stranded is used in elctrical wiring.. solid would be way too hard to bend..DUHH! As for the amperage characterics you may need to check out the NEC... National Electrical Code. Just because you aren't aware that not all 500MCM cables carry the same amp rating doesn't mean it's not so. Different Strand configuation becomes a big factor and a big cost increase too of course.
Just so you know I'm no Joe blow.. I'm and Electonics Tech certified in Communiction among other things, it's my job to know this stuff and I've been to several schools on the topic for installation and inspection and studied the NEC more than I care to think about.
No one actually suggest the OP use solid wire or ROMEX seriously that's just nutz... if anyone's confused of this try reading the thread and not taking things out of context. the OP asked a question and it was answered..
For Audio it doesn't matter... just get speaker wire and let this thread die
For the few that are convinced they know it all try Googling stranded vs solid... looks very much like my first post.. here's a paragraph of the first google hit....
Stranded vs. Solid Wire
This one is a bit of a mind-boggler, but it's important. When electricity flows through a wire, it mostly flows on the surface of the wire, not through the middle. This effect is more pronounced on high frequency AC than it is on DC or low frequency AC. This means that a "wire" of a given size that made up of many smaller strands can carry more power than a solid wire - simply because the stranded wire has more surface area. This is one reason why battery cables in your car and welding cables are made up of many very fine strands of smaller wire - it allows them to safely carry more power with less of that power being dissipated as heat. However, this "skin" effect is not as pronounced in a typical 12V DC automotive application, and the wire and cable used there is stranded for flexibility reasons.
When looking at a chart or description of wire capacity, take note of whether it is referring to stranded or solid wire - some charts may not specify but instead assume a default based on the typical wiring used in a given application. For example, almost all automotive wiring is stranded while almost all home wiring is solid. For most applications, flexibility or the lack thereof will be more important, but for very high frequency AC applications, stranded wire might be a requirement.