Quote:
Originally Posted by NLP
Gdje si to zasledio i u kakvom kontekstu detaljno?
Dosta toga može biti produkt koji omogučava bolji "imaging" 
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http://www.mhsoft.nl/helmholtzabsorber.asp
evo linka, zadnji pasus je u pitanju
Placing the TrapsThe first pair of traps should be inserted in the front corners of the listening room behind the loudspeakers. Care must be taken to use the trap only for its intended purpose: pressure absorption.
The next pair of traps should be placed in the rear corners behind the listening position. It is common to place larger traps in the rear corners and smaller traps in the front corners. However, if your listening position is at or forward of the room's midpoint, place the larger set of traps in the front corners.
The next, and usually final, step is to put one trap at the midpoint of the front wall. This trap, often referred to as the imaging trap, helps tame cross-correlated reflections and takes care of the room resonance which occurs at the midpoint of any of a room's walls.