Bläddrade bland mina lagrade dokument och hittade en artikel av v d Hul där det står
"Each speaker brings about its own position related (acoustical coupling with and excitation of) room resonance frequencies. These room resonances occur in three dimensions: along the room’s width, along the room’s depth and along the room’s height. Which resonance frequencies in the width dimension are excited, and how strongly they are, depends on the distance between the speaker and the left wall. Likewise the distance between the speaker and the floor or ceiling influences the height dimension resonances and the same goes for rear or front wall distance and depth resonances.
When a pair of speakers is exact symmetrically positioned in a room, their exited resonance frequencies are the same, resulting into a room tuning accumulated at dominating frequencies."
och så fortsätter han
"To break this pattern, position them with the common frontline at an angle of 15 degrees with one of the walls. This solves the problem in most cases of sound coloration. When you need more effect take a 20 degree angle. This trick also works excellent at hotel hi-fi shows where poor creative demonstrators always put everything perfectly symmetrical. Just not the right way to do it."
Det här kanske alla redan vet, men nog tycker jag mig se väldigt exakta symmetriska uppställningar i de lyssningsrum jag besöker, inklusive mitt eget, fast Carlsson är förstås inte så känsliga, men kanske borde jag placera mina ESL-63 lite annorlunda. Nu har jag mätt in dem så de står lika långt från respektive sidovägg och från väggen bakom högtalarna och likadant vinklade. Någon som ställer sina högtalare asymmetriskt?
Edit: En annan "tumregel" som presenteras i samma dokument är "Never take a seat close to a wall as I once saw in the house of a well-known American reviewer. Such a position puts extra accent on the bass reproduction in that room. As a rule, always keep your listening position more than 1 meter away from any wall."
