{"id":1309,"date":"2020-12-18T11:59:41","date_gmt":"2020-12-18T11:59:41","guid":{"rendered":"https:\/\/suesskindaudio.de\/?p=1309"},"modified":"2021-01-14T20:13:07","modified_gmt":"2021-01-14T20:13:07","slug":"aufstellanleitung","status":"publish","type":"post","link":"https:\/\/suesskindaudio.de\/en\/aufstellanleitung","title":{"rendered":"Installation instructions"},"content":{"rendered":"

Loudspeaker placement for optimal sound quality according to the Joachim Gerhard principle<\/strong><\/p>\n\n\n\n

After putting together a high-quality music system, the room becomes a
limiting factor for the sonic performance. There are many articles and theories about
the optimisation of the interface between loudspeakers and the room as well as via
Methods for damping critical room resonances. Damping treatments
of room resonances with the aim of achieving a linear amplitude response are
usually costly and can lead to a \"lifeless\" room sound. Also the
Development of loudspeakers for a specific location, e.g. loudspeakers which
are intended for wall mounting, restricts the placement options
and leads to different results depending on the room size. Our approach consists of
to investigate how the room and the loudspeaker interact and to find the best
situation without making radical changes to the room.
need to be.
Our solution limits the interference of the space by a specific
speaker placement and listening position, and by using the effects of the
Psychoacoustics. This method provides excellent results without the need for a
special room treatment is required; a carefully applied
However, room treatment can bring about further improvement.
Let us first consider these findings about hearing. To
to find out where the sound is coming from, our brain records the time between the
the arrival of a sound in one ear and the arrival of a sound in the other ear, or
the interaural time difference (IAD). For example, if there is no difference in the
time it takes for a sound to reach each ear, the brain determines that
the sound emanates from directly in front of us. When the sound first reaches the right ear,
the brain determines that the sound is coming from the right, and so on. The place from
which the sound comes is determined by the delay time, and the
decision is made unconsciously and extremely quickly. In fact, the
Brain the position in the first 800 \u00b5s of the initial transient, as this is the
is the maximum time delay that can occur due to the distance between the left and the
right ear is possible.
After this initial sense of place, the perception of tonality begins.
It is believed that this is a crucial part of our survival as a
Species is. In other words, we first locate the source of a sound,
that could pose a potential danger, for example, and then try to
identify what made the noise.
Consequently, the first step in obtaining a good stereo sound image is to
the sound comes directly from the speakers to your ears before this sound is
is reflected. If the first sound pulse from the primary source arrives earlier than all the
reflections, this prevents any confusion about where the sound is coming from.
comes. The scientific term for this psychoacoustic phenomenon is called the
Haas effect. When the loudspeakers under anechoic conditions
have a smooth measurement result, the brain also perceives a smooth response,
when the first sound pulse arrives before the reflections. So even if measurements
show strong deviations in the frequency response of reflections at the listening position,
the brain will ignore this and perceive a linear response. From this
Therefore, one goal of loudspeaker placement is to eliminate the earliest reflections,
e.g. from walls or windows.
An idealized example of these principles would be a well-proportioned listening room in which
where the loudspeakers are positioned at the two focal points of an ellipse, the
touch the walls of the room, as shown in the figure below. The best
Listening position is centrally between the speakers, with the head 30cm to a
meters from the back wall. At this point the sound from the
speakers protect the ears from reflections from the side walls. The advantages are
the greatest possible distance between the loudspeakers for the widest possible
sound stage and a maximum delay of the first reflections. Thereby
the best soundstage and tonal balance are achieved.
The direct distance between the speaker and the ear should be at least one
meters should be smaller than the distance between the loudspeaker and a
reflective surface and the ear. The reason for the difference of approx. 1.6
meters lies in the fact that if the reflected sound 5 milliseconds or more after
the primary sound arrives, the brain knows that it is not the source. The sound
moves about 1.6 meters in 5 milliseconds. Here is an example of the formula for
Determining the best listening position. Assuming the distance between loudspeaker
and ear is 1.6 meters. Then the distance between speaker and
wall 1.6 meters and between the wall and the ear 2.6 meters, so that the entire
reflected distance is 4.3 meters. 4.3 meters for the reflection - 2 meters from the
Source = 2.3 meters. 2.4 meters is more than 1.6 meters. This corresponds to our ideal.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

So why did we put the listening position near the back wall? The first
The reason is the bass amplification. The maximum sound pressure occurs at the room boundaries
and the pressure gives the feeling of a deep bass. Secondly, the brain can
not measure the time delay between the ears, because the reflections at the
back wall are shorter than the circumference of the head. If it does not measure the time delay
it can't locate the source of the sound. If the brain does not detect reflections
it ignores them.
Here are a few examples of how the brain can detect reflections or insubstantial
Information ignored. Imagine that you are at a noisy
public place and have a conversation with the person next to you. When you are talking from your
location, it would be muddled or look like it was taken from a
random sounds; however, you can isolate the conversation. When you
heard your name from a few meters away, you can focus
change and \"listen in\" on the other conversation. Another example is how we can change the
filter out the disturbing natural resonance of a corridor to hear speech better. In
a reflective acoustic environment, your brain automatically \"listens\" into the
Primary source \"into\" and ignores the reflections.
To sum up:<\/p>\n\n\n\n