Speaker wire enamelled copper wire 2l class 155 is most commonly used for speakers, although aluminum and copper-clad aluminum wire (CCAW) are also used. Copper is more conductive than aluminum and substitution of aluminum for copper requires a larger diameter wire for the same conductivity.

Copper is the most widely used material for speaker cable due to its low cost and low resistance. However, copper does oxidise so it needs to be well covered and insulated.

Features
Solderable enamelled round cu.wire
Thermal Class 155
30AWG 0.25mm
Insulated with polyurethane
self-fluxing enamelled copper wire
Conductor: Round 99.9% pure copper rod
Self Bonding Wire Enameled Wire For Voice Coils

Is speaker wire the same as copper wire?
All in all, speaker and copper electrical power cables are variations of the same concept. Investing in speaker cables is not always worth your money. Regardless of what you choose to go for, you can find pretty much any type of electrical cable at Nassau National Cable.

Speaker Wire vs. Enameled Wire
Or take an old (non toroidal) transformer, pull the laminations then use the laminations to build a suitable magnetic structure around the ready wound bobin, either a permanent magnet alternator or a full on externally excited machine should be possible, and it saves you a lot of coil winding.
Transformer laminations have good magnetic properties for this kind of thing anyway.

Where to buy enameled wire?
Exporting the enameled wire from LP Industry Company, the MOQ is 300-500kg per size.

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