Can one meditate in the "anechoic" chamber? It is not necessarily but I wonder what would happen if monk will meditate in  "anechoic" chamber?  

The Orfield Labs room was recognized as the quietest in the world

  

If you stand in it for long enough, you start to hear your heartbeat.
A ringing in your ears becomes deafening. When you move, your bones make a grinding noise.
Eventually you lose your balance, because the absolute lack of reverberation sabotages your spatial awareness.  

Here is link


  There will be -20db silence in the room.
  So may we know how much db of silence (internally) is produced while mediating?


So will monk be able to meditate in this room or he will suffer the effect of it?  

When we can hear heartbeat, bones grinding noise will he able to concentrate on breathing and could meditate without suffering?
Yes in a video ajahn brahm said that ajahn chah went into such a room. I think he said there was nothing special according to ajahn Chah.
The video was some Q&amp;A, but you can ask for more on his forum https://bswa.org/forum/