En cherchant dans le forum, depuis pas mal de temps sur le traitement acoustique et surtout sur les bass-trap, qui nous intéressent tous, pour limiter l'effet désagréable de raisonnance dans les petites pièces (<20m²), j'ai trouvé un lien très intéressant qu'il serait peut-être bon de rappeler, je ne sais pas si çà marche effectivement mais je vais le tester une fois que j'aurai fini le gros oeuvre de ma pièce dédiée.
voici le lien :
http://www.homecinema-fr.com/forum/viewtopic.php?t=29678060&postdays=0&postorder=asc&highlight=traitement+acoustique&start=30
ainsi que ce qui est dit dans le brevet de ce bass trap à membrane
qui selon le constructeur peut descendre en absorption jusqu'à 50hz
An object of the present invention is to provide a good low frequency absorption at the same time as resonance time is kept short, in for example auditoriums. Another object is to make it possible to vary the resonance time, which is advantageous in for example, concert halls, theaters, churches and similar rooms, where music, song and speech occur. In, churches, for example, it is preferable with a straight resonance time curve during the sermon to increase speech comprehension, i.e. relatively short resonance time, even in the lower frequency range, whereas during organ music a long resonance time is sought after in the lower frequency range. These objects have been achieved with the invention by the fact that sound absorbents in the form of plates, mats or similar constructions are arranged at an angle at at least one corner area formed by the walls and ceiling of the room so that the absorption surface of the sound absorbents is facing the interior of the room, and that in the corner area behind the absorbent there is an airspace so that the absorbents by the sound action will have a membrane effect.
The advantages of mounting accoustic absorbents diagonally between the wall and ceiling in a room are many. Firstly a good absorption in the frequency ranges under 300 Hz and even below 50 Hz is achieved. By choosing surface weight flow resistance and diagonal volume, maximum absorption can be adjusted to the frequency range desired in a specific room. Usage of the room's corners between wall and ceiling is especially important since sound pressure in the room is greatest within this area. By placing diagonal absorbents in these areas the sound pressures behind the absorbents are damped, which gives a high pressure difference over the absorbent. This difference results in high particle velocity in the air in the absorbent, which in turn results in great losses, ie. high absorption. The pressure difference also accelerates the absorption plate itself. The plate and the air volume trapped behind form a resonance system with one or more resonance frequencies.
Ciao à vous,
et si quelqu'un a plus d'infos ...
@+
spoon
