![]() ![]() If you set the resolution to 1/3 octave, you have more detail (but it may be a little more tricky to set the levels of each frequency). By blasting out Pink noise through a speaker (preferably a speaker with a straight frequency response – Genelec studio monitors maybe), and having a Mic (behringer ECM800 measurement pencil mic) run in through pro tools which is hooked up to a graphic EQ you can eliminate problem frequencies. You can cut the frequencies of lower them down a few DB’s to decrease their power.Ī great way to achieve a ruler-flat frequency response of a room is to perform one simple, yet very effective test. You can reduce the power of these problem frequencies/standing waves by using a graphic EQ in the room with the standing waves. My calculations here for calculating the axial modes of both rooms not only show what problem frequencies there are within a room but they also show how lower frequencies may be more of a problem in larger rooms as they have enough space to complete their whole wavelength. Using a thinner bar coloured in orange still, are the results that have come from my Height measurements. ![]() In thick orange, we can see my width/length axis which are the main problem frequencies of this room. I ran another test using the amroc room calculator and the results were as shown below: Therefore the calculations for the length are exactly the same as the calculations of the width axis. Height – 2.47 metres x 2 (wavelength) = 4.94. The Amroc room calculator has not only proven that my calculations are correct, but it also is there to show what other frequencies may be a problem inside my chosen room. You can see that frequencies 29Hz, 58Hz, 87Hz and 116Hz are highlighted in orange. The frequencies that will cause the most problems (axial modes) are highlighted in orange. I put the Length, height and width measurements into the measurement calculator and was given these results. I ran a test on the Amroc room calculator website to see if my results were correct. It is obvious that we can see 8 frequencies the exact same as the length and width measurements of the room had to be rounded up.Ģ9Hz, 58Hz, 87Hz, 116Hz, 145Hz, 174Hz, 208Hz & 232Hz. These are the problem frequencies of that chosen room. You now select each of the Frequencies which appear more than once throughout the measurements of the room. Length Mode Frequencies (Hz) of Empty room: The calculations for the Length of the Empty room were exactly the same as 5.96 (length) x 2 = 11.92. Width Mode Frequencies (Hz) of the Empty room: ![]() ![]() 344 (speed of sound) divided by 11.84 = 29Hz (rounded up) Height Mode Frequencies (Hz) of the Empty room: You do this same measurement to find the mode frequency of all three measurements. The first answer is the fundamental frequency of the height of that room. You do this by doubling the height of the room (in our case being 6.08×2) to achieve the wavelength, then dividing the speed of sound by this wavelength. So, we calculate the height axial modes first. You then take the speed of sound (344m/s) and divide it by the wavelength. In order to find any standing waves, you double the height or the width or the length by two to find the wavelength. My first task for providing a thorough analysis of both rooms was to find the axial modes of the rooms. I chose to measure the drum booth and the empty room next to the lecture theatre. I began by measuring two rooms found inside the Music Block. “Provide a thorough acoustic analysis of two rooms including using Fuzz Measure to calculate the T60.” ![]()
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