DIY Acoustic Panels – time for tests! (and LED lights)

welcome back this is Saturn and you watching tech brain John last time we started building acoustic panels we have assembled wooden frames installed fault fabric acoustic foam tiles and soundproofing insulation if you haven't watched part one yet you can find a link here or in the description below

our reponders are almost ready but there is still room for some improvements especially on the visual side this time I'm going to add a few details like LED lights and paths to distance panels from the wall I also ran some acoustic tests to prove how good the design

is and show you how the Palace improved sound quality in my home studio let's start so here we are with our simple acoustic power so far we have installed three different layers from Don's hobby player and some predict insulation foam on the back in general different materials interactive

sound in different ways sometimes tends to bounce on hard surfaces like walls floors and ceilings we want to prevent this by putting our panel between a sound source and a wall so what actually happens when a sound hits the power let's start with acoustic foam when a stand

away is the phone part of its energy is being absorbed this energy is then converted into a very small portion of heat don't worry though your power was set on fire even if you yell but please don't home tiles usually have an earring or surface like this wave

profile thanks to this foam we also diffuse the sound wave this can result in the reduction of effects caused by reflections and reverberation of course not all the sound will be stopped by front panel our second layer of defense is felt fabric which will absorb some of the

high frequency sound waves and now moving to the back here we have an insulation foam its purpose is to prevent noise from traveling to the loss you can notice that the sound blocking foam is typically heavier and denser than acoustic foam rule of thumb is that they tick

on the phone is the most sound it can stop especially when it comes to low frequency sounds like bass the fourth invisible layer will be an air gap between the panel and the wall this is of an underestimated factor of some panels normally acoustic foam will act primarily

on mid and high frequencies but you can improve the low frequency absorption by spacing frame away from your wall by a few centimeters a right combination of materials can make even a relatively thin panel efficient in reducing echoes reverberation and excessive noise as a result we get great

improvement in sound quality in our room now it's time to run some acoustic measurements to test how our panels perform here is a simple test setup that I've put together on the Left we have a microphone and on the right there is a speaker which will play a

frequency sweep signal both are connected to a laptop with a re W acoustic software first I did a reference run without anything blocking the sound travel between the speaker and the microphone next I've put the panels in between and I repeated the test [Music] I have run SPL

measurements let's look at the results first I have measured a baseline this is when nothing was blocking the sound travel between a speaker and a microphone the second line shows results when the panels were positioned in front of the microphone on the graph x axis shows the sound

frequency and y-axis shows measured sound pressure level in decibels explaining this in simple terms the lower the grab drops from the baseline the more reduction in sound noise we get you can see there is not much reduction up to 200 Hertz but when the sound frequency crosses 200

Hertz slide we really start seeing the effects of our acoustic panels for frequencies up to 1 kilo Hertz sound pressure has dropped by 10 to 15 decibels but we have achieved the best results in frequencies from 1 kilo Hertz to 20 kilo Hertz where there are over 20

decibel drops those are really decent visuals for panel dot size if you would like to reduce sound noise at lower frequencies unfortunately you would need to invest in much thicker and heavier design since I have limited space in my room I have decided to limit thickness and those

panel are the best trade-off for the size and efficiency since you have SPL testing done we can go make some final touches to the panels and then install them in the room to see how they work in real-life scenario this step is totally optional but how cool is

it to have some great-looking acoustic panels on the walls I bought LED lights that are responsive to sounds which gives a nice touch to the overall look my lights have effects where light starts from the middle of the strip so first I have found and marked the middle

part installing the lights is really easy using adhesive on the back of the strip I have attached it around the outer edge of the frame facing LEDs to the sides [Music] next I fixed the remote and power input on the side of the panel there is an option

to control this LED strip by a smartphone so you can decide to hide the remote entirely [Music] to distance panels from the walls I've attached parts on the corners you can decide to stack few parts to increase space between the wall and the panel we also need a

way of mounting panels on the wall for this I've used some hearings and three BOM I've simply measured the needed length then I put the ring in the middle and use the stapler to attach the ribbon [Music] [Music] and this is how the panelists look after adding the

LED lights in my opinion they look really great when placed on the wall when it comes to pala placement you want to get rid of early reflections by placing two panels at the first few friction points these are usually walls to the left and right from your speakers

and the wall behind you this way you will create a sweet spot around your listening position but do not cover your entire room with acoustic panels even in professional studios panels cover up to 40 50 % of entire room it is because we too much high and mid

frequency absorption the sound in your room can feel unnatural and everything will just sound bad in a small interior room like this one you can often experience poor sound quality this is due to sound reflections you can get a feel of the reverb simply by clapping your hands

this is addressed with panels but this test is not really that accurate in a second we going to measure and compare the decay times us in the last video I've used the re W software to perform the measurements first I did a reference run without the panels to

get the decay times of my room next I've put the panels on the walls and I've repeated the test [Music] in acoustics reverberation time measure known as RT 30 is used to evaluate room River our Tea Party is the time it takes for the sound level to decay

by the 30 decibels as you can see by installing our panels we managed to reduce decay times by a factor of two in the professional studios typical decay value times range from point 2 to point 3 seconds but if you are in a small studio or room like

this one aim for point one two point three seconds that's enough of the Terry if you would like to learn more about acoustical engineering I can recommend you some good reads you can find links in the description below if you are going to use your room as a

recording studio it is very important to test how your voice sounds like in the room so next I'm going to record short samples of me reading so you can compare the sound difference with and without panels safety instructions warning please read all of the safety information and instructions

failure to comply with the safety information and instructions may result in on fire or similar injuries danger to life batteries can be swolled which may represent a danger to life if a battery has been swallowed medical help is required immediately repair should only be cleared out by specialist

personnel nobody reads it anyway and that's all we've got great looking acoustic panels which improve the sound quality in the room I'm really happy with the results I've got with my build also LED lights will cool and add a nice effect I hope you enjoyed this video if

you liked it please remember to hit the like button and subscribe see you next time [Music]

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