Gauder Akustik VESCOVA MK II Bedienungsanleitung Seite 31

Please take care of using the radius and not the diameter of the vents
and that the square root only concerns to the number of vents.
The trap should be filled with damping material from 1/3 to ½. The
damping material virtually increases the capacity of the cabinet and the
vents decrease it. These two reversed effects often cancel and you can
take the above equation with good conscience.
The geometry and shape of the cabinet are of no interest. Recommen-
dable are nearly cube-shaped cabinets.
As vents you can use simple plastic tubes or bass-reflex vents for loud-
speakers. It is also possible to fill in the damping material through the
vent holes.
The placement of your trap in your room is really decisive for the effecti-
veness of the trap. Normally a place at the wall or in a corner is best but
you have to determine the best place by moving and hearing. As liste-
ning test you just take one CD with a boomy bass which excites the
room strongly.
The best result is often achieved by placing the trap between your sofa
and the wall. But remember to keep the vents free. You can also take
cupboards or tables with a big foot as a trap cabinet. Or just build a trap
in the right shape and use it as an additional table.
Reflectors and Diffusors
Many badly damped rooms exhibit long-lasting echoes which are thrown
back and forth from two opposite walls. This is a very unpleasant acous-
tical phenomenon as it strongly decreases speech and music intelligibi-
lity. This lack of diffusivity can be omitted by „breaking" the corners of
your room with obstacles like furniture, plants, lamps or any fractal ob-
jects. It is also possible to build some corner reflectors if possible with a
rounded surface and fix them in the corners.
Reflectors at the side-walls should also be used if the room is too highly
damped. The ear needs some information from left and right for a better
speech intelligibility and localization of the acoustical sources. This late-
ral sound also increases the channel separation and transparency. So
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don't try to damp only the side walls. The ceiling and the floor are the