Hi Quincy,
Depending on how and how much your hearing has been overloaded, the frequency response of your hearing might be good or might be terrible. It is difficult to judge how much the levels are different between two frequencies.
My hearing has always been pretty good because I avoided exposure to loud sounds.
I measured the frequency response of many speakers by using fixed frequency sine-waves, using sine-waves with a frequency sweep and using pink noise with a real-time analyser.
When measuring the frequency response of speakers then echoes must be avoided. I layed a speaker box on its back on the ground outside pointing straight up to avoid echoes, then suspended a good quality and calibrated microphone above it. Speaker manufacturers use an anechoic room.
If you try to measure the frequency response of a speaker indoors then the echoes will make peaks and cancellations all over the place. If the speaker is one meter above the floor then there is a direct path and a longer path cause by sound bouncing one time off the floor. They cause a cancellation at a mid-range frequency. Echoes are also from walls and the ceiling.
The frequency response of speakers changes if the angle changes. The best response is directly on-axis.
