Surround, Atmos - Hvordan skal højttalerne hænge?

Men hvordan vil du placere dem i loftet set oppe fra i forhold til sofa og væg ?

Har leget med atmos og dets x. To vidt forskellige højtaler opsætning, når vil taler om 5.1.2 for os der ikke har pladsen. Vores atmos er nu 1,5m fra sweetspot. Da snurre rundt lyden er bedst fra vores sofaer. Der tænkte jeg øv. Og dog. Så tænkte jeg, hvis jeg sætte højtalerne til top front, så da atmos er objekt baseret, så rykker lyden med til det passer med top front. Og bingo, så var lydoplevelser igen. Bare ikke den der regn lige over en osv. Men lyden fra front og til bag. Virker lige godt. Og så for dtsx mere ret, end ved top midt. Så hvis andre er i sammen situation som mig. Så er det at anbefales. Lyden er ikke ringere, den er bare anderledes god

Kandersen skrev: I øvrig synes jeg deres illustrationer er lidt misvisende.  Afstanden mellem fronterne (Stereo) skal være den samme som afstanden fra fronterne til lyttepositionen. Det lader ikke til at være en vigtig detalje i deres illustration.

Afstanden imellem front højttalerne skal være 60 grader. Fra centerlinjen 30 grader.

Sven Palvig skrev: Det er et meget bedre system, at have Auro-3D end Dolby Atmos. Det er meget mere nærværende. Dolby Atmos har lyd gengiver i to lag, og det øverste lag er placeret for højt. Auro-3D har tre lag, hvor lag to er nede i 30 grader, der passer langt bedre til vores hørelse. Det tredje lag er en enkelt højttaler lige over vores hoveder. Det giver en bedre samhørighed vertikalt. Det øger bredden af lydbilledet, når man har 4 High højttalere placeret over fronterne og surround højttalerne.

Potter skrev: Hvor mange film på 4k UHD disc med Auro-3D er der enlig udgivet i dk? Det er vist under 20.  Ikke i tvivl om at Auro 3D er interessant, men som jeg læser det så giver det en del udfordringer i forholdhold til korrekte placeringer med det rette antal højtalere for at opnår noget der virkelig dur.  Dem der har en alm. stue bio kan måske løbe ind i nogle udfordringer med fruen etc.

Det må være nemmere at montere Auro-3D, da man har 4 ekstra højttalere som minimum placeret over 5.1 Altså over fronterne og surround højttalerne. Surround højttalerne og surround High kan placeres i et hjørne som de fleste kan få plads til.

"HOME VS. CINEMA - STANDARDS
Various standards and recommendations exist for the different applications of multi-channel sound in different environments such as cinema, broadcast and home use. The two most use recommendations are the ITU-R BS.775 standard for multi-channel sound from the International Telecommunications Union (an international standardization body) and the THX recommendations for cinema (a commercial organisation). The ITU recommendation is the most used standard for 5.1 Surround Sound in broadcast and home cinema applications. One of the recommendations is to install the speakers of the Surround system at “ear-level” (typically between 90 and 120cm height). This has the big advantage that most sound sources (with their origin at ear level) can be reproduced as in real life. Sounds that move from the front channels to the surround channels (e.g. cars, bikes passing by, etc..) can be positioned where we expect them. A good audio-visual coherence allows for our brain to believe that the sound we experience relates to what is seen on screen., increasing the immersive experience.

In practice, regular 5.1 Surround systems suffer from a ‘hole’ between front and back speakers, due to the way the human hearing system works, making the sound jump from front to back. When adding a quadraphonic Height layer, like in Auro 9.1, this effect is dramatically reduced, eliminating the need for 7.1 surround as a basic layer in order to solve that issue. Installing a 7.1 Surround system is also not practical in most home cinemas , whereas 5.1 is much easier. There is also often place above the corner speakers of a 5.1 system to add Auro-3D’s unique Height Layer, making it a practical solution for real 3D Immersive Sound.

The THX 5.1 standard became famous in the professional cinema industry and was also adopted in high-end home cinemas. But there is a big difference between a sound system designed for a large theater with hundreds of seats and a system for a home theater with 10 to 20 seats. In order to create good dispersion of the sound in a cinema theater, the speakers need to be installed higher than ear-level (THX recommendation is based on a 15° elevation angle). The same is true for the screen channels although most of the source sounds at screen have their apparent origin below the middle of the screen. This is not the case in a small room where sound can be equally spread across the room without the need of elevating the speakers that high. Installing the surrounds higher than ear-level might make sense for 5.1 or 7.1 Surround sound systems because not all sounds originate from ear-level and a compromise can be made by elevating them up to 15° as done in large theaters. But when installing additional layers to reproduce the Height information, it is much better to install the ear-level layer as defined in the ITU recommendations.

Dolby Atmos’ speaker installation for cinemas is not based on the existing THX 5.1 surround standard. The surround speakers are positioned substantially higher, much closer to each other and with completely different orientation towards approximately the middle of the room. This results in a different sound experience than coming from a standard 5.1 system.
All sounds seem to come from above since ear-level sounds cannot be experienced with speakers that are installed so high. The smaller distance between the surround speakers and their orientation towards a single sweet spot area is not only making this area smaller but also results in a less natural sound when reproducing the channel-based content (on average more than 85% of the sound energy in a Dolb Atmos mix) or a standard 5.1 Surround mix. Dolby Atmos recommendations also position the speakers behind the screen higher (2/3 instead of 5/8 in the THX recommendation) to improve horizontal alignment between the screen channels and the elevated surround channels. The background for this is that isolated objects should not ‘jump’ to different heights when moving in the horizontal plane around the audience.

The Auro-3D formats (including AuroMax) do not suffer from this problem since they use 2 layers on the walls instead of a single layer. Additionally, they are based on the existing 5.1 surround standard speaker layouts already installed in the room, not only behind the screen but also around the audience. This compatibility between professional and home cinemas also allows for a better translation of the cinema experience into the home. Taking in account that the home cinema is also used for other content than movies (games, music, live events, sports etc…) it really make sense to install the ear-level and height layers as defined by the Auro-3D format. They are easier to install and the overall result will be better for all kinds of content. "

Redigeret af Sven Palvig - 12-August-2018 kl. 15:41