How many speakers can be carried in one line depends on the power of your amplifier. If one of your speakers is 8 ohms, two speakers connected in parallel are 16 ohms. Three speakers are 2.7 ohms.

The impedance calculation method is as follows:

Series connection: R=R1+R2+R3

Parallel connection: R=R1XR2XR3/R1XR2+R1XR3+R2XR3

If it is parallel connection If so, the power of the power amplifier must be large enough. If you use a constant-voltage power amplifier and a constant-voltage speaker, it only needs that the total power of the speaker does not exceed the power of the power amplifier. Ordinary wires can be used as signal transmission lines.