welcome to tom's. :)
you can talk through the speaker using your mic by unmuting it. one of the way you can do that is by right-clicking on the volume icon in the notification area > click 'recording options' > right click on your microphone > properties > click on the 'listen' tab > check the 'listen to this device' box and click apply. you might have to slowly raise/lower the speaker volume so that you can hear clearly.