October 19, 2020
In mathematics, if two numbers have the same ratio as the ratio of their sum to the larger of the two numbers, they’re said to be in the “golden ratio.” If that sounds like Greek, don’t worry. The “golden ratio” in sound – more specifically in acoustics, doesn’t require you to understand the mathematical term and all its implications.
Instead, this ratio is related to set of ratios that tend to lead to the best acoustic response in a room, with a minimum of acoustic interference anomalies such as comb filtering, nodes, peaks, or dips. Knowing these ratios can help you to look for the best room in a house to put your studio or rehearsal space and are especially useful if you’re building a new space and can control the dimensions of the room.
It turns there are more than one set of ratios that have proven useful to acoustics experts over the years, besides the classic golden ratio – they’re all related to the golden ratio – here are a few:
Any of these room ratios will prove much better for minimizing acoustic issues, and in some cases could nearly eliminate the need for acoustic treatment – depending on your usage.
For the most part, we consider the fixed number the height of the ceiling, which is normally 8 feet. So for example, a room built to the classic golden ratio would be 8 feet high by 12.8 feet wide by 20.48 feet long. A big room!
Many rooms built to spec opt for 10-foot ceilings instead, which would yield a room 16 feet wide by 25.6 feet wide when using the classic ratio. It’s not common to have that much space, so some of the other ratios are often used, for example 8 feet by 9.12 feet by 11.12 feet – a much more normal size.
Unfortunately, most existing rooms are not built to these specs, and are often built with evenly divisible ratios, which is a headache for amateur and professional acousticians alike. This is why learning a bit about smart acoustic treatment is so crucial.Of course, it is possible to adjust a room’s dimensions – at least to some degree. An existing room is hard to make bigger, but it may be possible to make the room slightly smaller by adding a false wall on one or two sides, or even a false ceiling. For example, take the room this article is being written in. 16.5 feet long by 8.5 feet wide with an 8-foot ceiling. Dividing the length and width by 8, we can see that the ratio of this room is 1 x 1.06 x 2.06. Not ideal, but at least not evenly divisible.
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Mixing is an interesting art. If a mix is coming together, you’ll want to jam out. And since you’re hoping people will listen loud, new mixers are often tempting to mix at high volumes. It turns out, however, that mixing at high volumes is the last thing you should do. In fact, professionals across the board use the “conversation” method of setting a listening volume for mixdown: mix at a level where you can comfortably have a conversation over the music.
Here are the top five reasons why you should mix at low volumes.
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