Sure, here is an example of python code to show you how to turn your speaker on and off.

```python
import RPi.GPIO as GPIO
import time

# Set the GPIO pin number
pin_number = <PIN number>

# Set the GPIO mode
GPIO.setmode(GPIO.BCM)

# Set the desired pin as an output
GPIO.setup(pin_number, GPIO.OUT)

# Turn the speaker on
GPIO.output(pin_number, GPIO.HIGH)
time.sleep(5)

# Turn the speaker off
#GPIO.output(pin_number, GPIO.LOW)

# Clean up the GPIO setup
GPIO.cleanup()
```

Note: For the code to work you need to install RPi.GPIO library. To do this type "pip install RPi.GPIO" in the console. And remember to change the PIN number to the one you actually connected your speaker to, for example: "pin_number = 18".
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