The next pages will tell you about my research and what I did to treat my room. You should be able to take the same principles I've used and apply them to your own room.
Please note that I'm not an expert in this field and all knowledge presented is the result from some internet research. If I've made any mistakes (even grammatical) I'd be happy to hear about them and correct them!
Step 1: Research
First thing to know is that sound is vibrations in the air, measured in vibrations per second, which is called Hertz, shortened as Hz. Sound is often divided into three main categories:
Low 25Hz to 250Hz Tones you can feel as well as hear
Mid 250Hz to 2500Hz Tones in the range of the human voice
High 2500Hz to 25000Hz Tones you can easily block out by covering your ears
Each of these ranges have their own problems and can be fixed with specific objects as described later on in this instructable. Common problems by having to much or too little of a frequency range are:
Low Bass tones which are boomy or disappear.
Mid Unclear sound where its hard to distinguish instruments or sharp/painful sounding music.
High A high pitched ring in the room, or a room sounding muffled.
So, what to do? Well, two two physics formulas shown, tell us the following
"The first parameter, ω0, is called the (undamped) natural frequency of the system . The second parameter, ζ, is called the damping ratio. The natural frequency represents an angular frequency, expressed in radians per second. The damping ratio is a dimensionless quantity." From: https://en.wikipedia.org/wiki/Damping
Ok, maybe not so clear. But what we can get from this, is that every matter will dampen sound and this is mainly dependent on two factors. First is that each material will have a certain property that determines how well it can dampen frequencies, and second is that increasing the mass (weight) will lower the dampened frequency. This is actually quite intuitive; While a tissue might absorb some high frequencies, you need something like a mattress to dampen lower frequencies.
With this in mind, I took a look at different websites such as
and of course https://www.google.nl/search?q=low+cost+studio+treatment&oq=low+cost+studio+treatment&aqs=chrome.0.57j60j59j60j61j60.3744j0&sourceid=chrome&ie=UTF-8
With all this information soaking in, I started making a plan.
There are two main types of acoustic treatment and three frequency ranges to apply them on. Diffusers and absorbers. Diffufusers reflect and spread the sound instead of bouncing it back like a wall does. Absorbers take in the energy of sound and make it disappear. Both of these can be made for all three frequency bands.
Step 2: The Room
Some constraints are in the geometry of the room. Mine has a huge window I wanted to keep free, And there are two doors an a big closet I couldn't put anything in front. Symmetry is important in getting a good sounding room, and my room isn't. This means the acoustic treatment should play with this asymmetry to avoid worsening the problem and rather balancing it.
Step 3: Design
I made a few sketches of what I wanted to do and finally came up with this design, see annotations. I'm putting absorbers in place for all frequency ranges as well as doing some diffusion for the high range.
Step 4: Materials
4x 300x4x2cm beams of wood (€4, could be picked up for free, but I was impatient)
2x 150x50cm boards of hardboard (€4, similar)
10x randomly sized blocks of foam (free)
expendable fabric (free)
screws + plugs (€2)
random objects (free)
Total costs: €20
Step 5: Building Bass Trap One
*please let me know if you feel this is wrong, I'm not an expert!