Hur inverkar kontrollbordet på frekvenskurvan vid lyssningsposition i kontrollrummet när placeringar av högtalaren och lyssningsposition placerats efter ITU-R BS.1116-1 rekommendation?
The acoustics in a control room is a complicated phenomenon. Early reflections, reverberation time and area in the room are some of the problems. This report is about the reflection on the mixing console in a control room. The control room being built, these reflections are difficult to take into consideration since the mixing console is one of the very last items you place in the room. This report will explain three main measurements that were done in order to get the answer to the following question: Does the mixing console interfere the frequency curve at listening position? Three measurements were done and the difference between the measurements was that the microphone and the loudspeakers were placed in different places in the control room. Two of these measurements were done in a similar way: a measurement with the mixing console and a measurement with foam rubber. The third type of measurement was done with a wooden plate placed on the mixing console. The mixing console has a certain effect on the frequency curve, which is clearly visible on the frequency responses that were measured. The curves show the frequency differences when the speakers are placed in various places in the control room. The difference between certain frequencies measured with the mixing console solely compared to measurements with foam rubber was amazing in the first measurement, which did not show any visible reflection. The second and the third measurements had a reflection on the mixing console that disappeared when the foam rubber was added. With the third measurement you could see that the mixing console absorbed the sound when you compared the impulse response curves with the two first measurements.