What Type/AWG Wire for Binding Post to Speaker Terminals?

It looks like maybe 22 ga.

The length of 'skinny' connecting wire inside a speaker cabinet is so short that it introduces an insignificant amount of resistance to the flow of current.

It is in the longer run between the amplifier and the speaker where the benefits of using a thicker wire to reduce resistance are obtained.

Using too thick a wire internally can cause problems in crimping or soldering the thick wire to the driver terminals as well as putting undue stress on the terminals due to the weight of the cable.

I have used bog standard, 16 gauge, 42 strand, PVC insulated copper wire. It has a resistance of only 0.02 ohm per metre.
 
If your speakers are 8 ohm your 22 (?) gauge wire will be adequate for the internal wiring.

If your speakers are 4 ohm you may like to consider using a smaller gauge number for the internal wiring - 18 gauge would be fine.
 
I use AWG-18 coaxial cable(TPC), which I think is thick enough.

 

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