Compensating for flat frequency response to listener's brain by removing the tube on omnidirectional microphones

At your own risk.


There is a thin tube usually used in omnidirectional microphones (see references) to extend their frequency response down at lower frequencies and then dropping abruptly.


But many otherwise great sounding microphones sound bass heavy to listener's brain on vocals due to Fletcher- Munson, voice effort curves etc when used for intimate close micking.


How would for example the fabulous Sennheiser MD21 sound with the tube disconnected? It is documented on Trashblitz that it is difficult to open and especially closing back the microphone.


References:


Elements on Acoustical Engineering - Harry F. Olson


Microphones - Robertson - BBC engineering training manual


Sennheiser MD21 - Trashblitz


Flat frequency response from singer's vocal chords to listener's brain, Sound Picture Recording and Reproducing Characteristics - Loye, Morgan - Journal of the Motion Pictures Sound Engineers