homemade mic

Another one of my homemade mics, this one is my most elaborate.The element is a headphone speaker going to a passive EQ to get the bass up and that's going to a computer speaker amp to boost the output and act as a buffer.The response is good except for that bump from 2k to 3k.The whole thing is powered from 4 C batteries.Although built for fun I do like the sound and have used it in some of my recordings.
Imgur: The magic of the Internet