Not exactly sure what you'll hear. For sure it should make the response a bit more neutral while retaining the bass hump, which actually is something most people like anyway. I didn't fix the 20 kHz peak. It's only on-axis, and you probably won't notice anyway. In any case, it will be a bit less bright.. possibly too much so. The lower midrange is boosted a bit, possibly will give a bit more bass detail. Getting rid of the 1 kHz peak might clear up female voices a bit.
... but who knows... It might be total shit
Best to get a mic and do your own measurements.