an electric guitar can be played with a speaker. However, it will not produce the same sound as it would if it was played through an amplifier. This is because an amplifier is designed to amplify the signal from the guitar and to shape the tone of the sound. A speaker is not designed to do this, so the sound will be much quieter and less distorted.
There are a few ways to play an electric guitar with a speaker. One way is to use a headphone amp. A headphone amp is a small, portable amplifier that plugs into the guitar and allows you to hear the sound through headphones. This is a good option if you are practicing at home or if you want to play quietly.
Another way to play an electric guitar with a speaker is to use a direct box. A direct box is a device that converts the signal from the guitar into a format that can be plugged into a mixing board or recording device. This is a good option if you are recording your guitar playing or if you want to use the guitar with other electronic instruments.
Finally, you can also play an electric guitar with a speaker by plugging it directly into the speaker. This is not the best option, as the sound will be very quiet and the tone will not be as good. However, it is a possibility if you do not have an amplifier or a direct box.
Ultimately, the best way to play an electric guitar with a speaker depends on your needs and preferences. If you need a quiet option for practicing, then a headphone amp is a good choice. If you need to record your guitar playing or use it with other electronic instruments, then a direct box is a better option. And if you just want to play the guitar with a speaker for fun, then plugging it directly into the speaker is a possibility.