Despite all the tricks with choosing a low-noise directional microphone, the room has a strong impact on the sound quality. To reduce the influence of sounds from the outside, the room is soundproofed, and to reduce the influence of sounds from the inside, it is acoustically treated. Using the materials at hand, you can come up with an excellent result. And if you take it seriously, you can achieve studio quality.
Reducing the reverberation time
Recording can be done even at 1 am, when no one is making noise, but the room will always contribute to the recording in the form of reverberation, hum and hovering echoes.You can significantly reduce the reverb or change its character simply by doing a small rearrangement. But this is often not enough, especially when it comes to striving for quality recording. This is where acoustic panels come to the rescue.
The easiest and most effective way to reduce reverberation. To some extent, friction panels also work against sounds coming from outside the room. When located near walls, the effectiveness against low frequency sounds is reduced due to the decrease in the speed of air movement.Panels are made of mineral wool and covering material, and such a panel is attached directly to the wall. The only difficulty is that it is necessary to work with such material in a painting suit, gloves, FFP3 respirator, closed-type goggles and outside the living quarters – the material is very dusty during processing. If for some reason this is not possible, instead of mineral wool, you can use linen mats, holofiber, rags, towels, felt or felt, including artificial ones.
Most effective in the area of maximum pressure – near the walls. Most of them are very difficult to set up and calculate. The simplest option is to use foam rubber with a thickness of about 10 cm, glued to thin plywood, which must be hung at some distance from the walls and ceiling. Such a panel simultaneously extinguishes the entire frequency spectrum, and the efficiency of absorption of different frequencies is regulated by perforation, changing the distance to the wall and the side of the foam rubber glued on. Depending on the specific room, the customized panel can be up to 30 cm thick.
It is important not to overwhelm the room. Such methods have little effect on low frequencies or require a lot of space. In a congested room, the middle and high frequencies from the room disappear, and the humming bass remains, especially the male voice suffers greatly from this.
If it is impossible to absorb reverberation without skewing towards the bass, use diffusers. Making an acoustic diffuser with a drawing , a jigsaw and a screwdriver is very easy and definitely cheaper than buying a finished product.
You can save a lot by positioning the diffusers and sound-absorbing panels taking into account the recording location, as shown in the video.
Deleting conversations under the window, which you can’t even hear with your ears, but which are very clearly audible on the recording, can take much longer to process than recording the second take. And, no matter how you glue the walls with pyramids, a lot of noise enters the room through the windows and doors.It should be understood that perfect sound insulation will require significant costs and is almost impossible at home. But for amateur tasks, the required level of sound insulation is much lower, unless, of course, you wanted to do audio editing through monitors at 2 am at maximum volume.
The most budget-friendly option for reducing extraneous sounds on a recording is to record at night. But, for obvious reasons, not for everyone and not always suitable. A budget option for soundproofing windows is blackout curtains and switching the window to winter mode, using putty.
But if it blows from under the window, you will have to update the thermal insulation and not forget about the acoustic sealant. For the door, first of all, this is the improvement of the seals. This will require sealing rubber bands.The problem with the lack of a threshold can be solved with a sealing brush for the door or even with a towel, plugged the gap under the door.