I was looking online to measure frequency response of a speaker. Most of the technique they provide is to place a microphone in front of the speaker to measure frequency response of the speaker. I find it to be inaccurate with large amount of unidentified error. I came up with the idea and have shown it in image bellow. I would like to know is my concept good enough to give me accurate frequency response of speaker than traditional technique.
If there is problem in the concept please let me know how to solve it.