headphone calibration
 

is there some sort of a free program i can use to calibrate my headphones using a microphone? my microphone should be fine for it but i cant seem to find any such programs on google

i just got some supper cheap headphones that seem way beter than thy should be but there is something out of wack with the calibration that i cant fully work out so i was hoping something like that at the very least could give me a better base line to work from