Diffuser qrd: Acoustic diffuser panels for acoustic treatment

Diffuser qrd: Acoustic diffuser panels for acoustic treatment

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In many recording studios with improvised acoustics one often sees sound-absorbing pyramidal panels that only serve to eat the excess mid-high frequencies. When it is necessary to correct the acoustics of a shooting room or a control room often it is necessary to intervene on a good 30% of the walls, if this work is done with acoustic foam or polyurethane sound absorbers, it is inevitable that the sound of the room will be horrible, full of lows is dead in the mid-highs, other than acoustic treatment, better to record in a cellar! When you intend to treat the acoustics of a room with pyramids that are often 3 or 5 cm, it is unthinkable that the low frequencies that need large thicknesses starting from a minimum of 15 cm are absorbed if we really have to talk about bass traps. Low frequencies are the hardest to remove and if you want to know how to remove them and where to buy bass traps you can read on this article . Once you have removed the excess low frequencies that generally range from 20 to 500 hz without using the pyramid panels, you simply have to smooth out the frequency response from 500 hz to 20,000 khz, certainly to do this it is not a good idea to use 3 or 5 cm pyramidal panels that generally would work only on the mid-low frequency range. If you really want to use the pyramidal panels, use the 10 cm ones, but avoid entrusting this work only to the pyramidal ones, the risk of excessively absorbing the medium-high frequencies is high. Many studies dealt with in you have to alternate absorbency with reflection by using wood panels such as i Vicoustics various duo panels .

The beauty of these panels is that they absorb more mid frequencies than highs, this way you will avoid making the room dead, but beware, these panels do not absorb low frequencies. Here are the frequencies it mainly absorbs:

As you can see the highest absorption peak is on 500 hz which represents that boxing effect of a chamber, moreover it also gets to absorb a little bit of the medium-low which is not bad at all. This type of panels simulates what an acoustic diffuser (also called acoustic diffractor) would do, with the difference that it absorbs and reflects at the same time while an acoustic diffractor breaks the sound waves and spreads them in the room making the sound more linear. With loudspeakers it is difficult to ruin the acoustics of a room, albeit exaggerating, while with panels such as those of vicoustic you could have holes in the mid-low range and others too reverberating, obviously this is also difficult because usually the opposite happens. , but this is just to make you understand that if you have removed the low frequencies through the bass traps, you can balance the mid-high range even just by using the acoustic diffractors without sound absorbing panels, and above all it marks the useless pyramidal panels that you can only find in the studios of low end. If you notice it in professional studios it will be very difficult to find the pyramids stuck to the walls, rather you will find a lot of wood around, the sound takes on the color of what it encounters, so the wood gives a nice warmth and color to the sound. The wooden loudspeakers cost a lot but there are also variants in plastic materials, but don’t expect the same sound performance, among these you can see the auralex t-fusor models which also cost a lot. Are you willing to pay hundreds of euros for plastic pieces ?, there are also eps loudspeakers which are slightly cheaper but still are styrofoam pieces that are sold as if they were gold, this is the case with acoustic diffuser panels Vicoustic Multifuser DC2 . Unfortunately, the companies that produce these panels take advantage of the fact that it is a niche market by exaggerating the prices.

Where to buy wooden loudspeakers?

Currently the best offer comes from Pikacoustics.com where you can find all solid wood panels at a fairly affordable cost, here is the page where you can buy them. Unfortunately there are very few manufacturers of wooden acoustic speakers, the few that exist charge even more than 200 euros for a 60x60x11 cm panel, but currently the most honest prices are around 120 euros per panel. Unfortunately wood costs money but there are those who have been able to make this limit a good business, it is the case of hofa akustik which has created very light plywood loudspeakers, in this way it has reduced production costs, consider that the thickness of quadratic wooden speakers is 1 or 2 millimeters and they work from 700 to 3000 khz approximately, they do their job but don’t expect the quality of massive speakers.

If you want to find other models of acoustic speakers you can write on ebay, aliexpress and especially on alibaba the words sound diffuser, diffuser qrd, wood acoustic, etc. but don’t be afraid of the prices.

How many types of loudspeakers are there?

There are loudspeakers in various forms, they are all a little equivalent even if they work in different frequency bands. If possible, use more speakers to smooth out a wider range of frequencies. When you buy the speakers from certified companies it is possible to obtain the technical data sheet with the frequencies that are spread, if you buy the speakers from a craftsman it will be more difficult to understand which frequencies they are tuned to, but in any case they will do good to your plan. acoustic treatment. In the image below you can see some of the various types of loudspeakers.

Acoustic correction