In this example, the primary critical mid-range frequencies have not been addressed. Thus, in this example which has taken about 5 minutes, I hope that you can see that simply hanging or laying rugs and carpet, and other assorted treatments do not simply achieve what many hope they achieve. And that is when you can run around taking measurements and verifying both the well behaved aspects as well as identifying and correcting the lest well behaved aspects. Auralization tools can even allow you to literally hear the difference in the model for any given listening position based on the the various adjustments.Īfter a satisfactory model is prepared and the system installed, the fun of tuning the actual result begins. (also these tools allow you to optimize speaker placement, orientation, and MANY other variable too numerous to address in this space. Thus, knowing the values of these material characteristics allows one to plug them into a powerful modeling program such as EASE to provide a beginning predictive model. And as a result there are myriad databases of the measured real world frequency dependent characteristics for different materials across the frequency spectrum. In order for a room to be tuned optimally, the reflective and absorptive characteristics of a material need to be known. It will be different! Will it be optimal? Probably not! And here in lies the real challenge. It will not however provide a linear correction. It will aid in attenuating some of the reflection.
#Media room carpet full#
Depending upon the warp, weave, distributed density, and other various attributes of the carpet, etc., it will not provide a linear response above this frequency either!Ĭombine this with variables such as a pad, which will also have a distinctly different absorptive and reflective behavior over the full range of audio frequencies and you will have added a very non-linear acoustical treatment.
Thus not all the energy will be absorbed. The real world will tell you otherwise, as the carpet is not entirely absorptive and it will have a reflective coefficient as well. Thus we could very simplistically say that the carpet would attenuate the frequencies above 6,365 Hz and have essentially no effect on lower frequencies. This corresponds to a quarter wavelength of a frequency of 6,365 Hz. (I hope you can already see that we realistically have to deal with a wider range of incident angles!)įor 3/8" carpet, the length of travel at 45 deg would be. And for our example I will simplistically assume a 45 degree angle.
Rather, much more acoustic energy is incident upon the surface at an angle. I will then give you a rough idea of the effect the carpet will have and thereafter raise a few of the real variables that make such a prediction so prone to error and variability.įirst, the absorptive qualities of a substance are not determined in the real world by the orthogonal thickness (perpendicular distance from under surface to the top of the material).
For the purposes of calculation we will assume the carpet to be totally absorptive (which it is not in actuality!), and we will assume no padding for the sake of simplicity. So, in order to give you an idea of the realities that are involved, allow me to mention a few variables.įirst, we will assume a single layer of carpet 3/8 of an inch thick for our example.
#Media room carpet install#
Yes, the carpet will provide some reduction of the reflections of some frequencies, but it will not do so in as well behaved a manner as expected, and it is difficult to qualify the effect without either much more specific information or, better yet, actual measurement of a sample followed by performance tuning based on after install measurements. Boy, this is not as simple as most will expect it to be.īut lets take a look at just the acoustical effects of the carpet, ignoring all of the other substantial factors.
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