internal speaker faulty now that screen is cracked

I accidently damaged the screen (broken in the left hand bottom corner), and now when trying to operate facetime etc I can hear the other person although they cannot hear me!! Since breaking the screen, i placed a screen saver over it, as the part had shattered into 2 or 3 small pieces ( damaged area measures 1 cm x 1 cm) and did not want a tiny section to come away!

I can hear all my music etc just fine, only problem speaker now just operating one way!

Is this something that can be repaired? and if so is it a relatively easy repair?

Thanking you

K D