During the designing phase, the specialists of the INTERTON Group made the accurate building acoustic model of Keleti station, took all aspects of architecture and monument protection into consideration, and created a system , which confidently meets the speech intelligibility and sound pressure expectations required by MÁV. INTERTON Group specialists have established a total of 30 sound technology zones at the Eastern Railway Station. Nothing indicates the huge dimensions of the building - thus the size of the task - better than the fact that the farthest/furthermost speaker is located 300 m from the central distributor, where a delay of 875 milliseconds had to be applied. The entire system was delayed by considering the sound pressure overlaps, which greatly contributed to the end result
The power of the huge 8-meter IVS column speakers manufactured by the INTERTON Group decreases from the top to down, so whoever is directly stands under it is not disturbed by the volume, but at the same time the sound level is appropriate even over longer distances. Thanks to the IVS column speakers, almost the same sound pressure could be achieved at all points in the Great Hall of the Keleti
The total power of the system set up by the INTERTON Group at Keleti Station is 32,000 watts. This may seem overwhelming, but it is essential to ensure good speech intelligibility. All IVS column speakers of the same type can be EQed at the same time, and separate EQ settings can be applied to each area. The central brain of the sound system is the QSC Q-Sys network audio system. The Q-Sys distributes and adjusts the signals, and continuously monitors the QSC amplifiers via a data port, which provides information on temperature, output current, output voltage and even the status of the front panel gain knobs. Any change on these knobs immediately detected by Q-Sys and signaled to the user, indicating the exact level of modification. For inrush limiting, the amplifiers turned on with software controlled soft-start sequence. The Q-Sys system is controlled by the passenger information system via a LAN, making the system perfectly automatic. All data port QSC amplifiers can measure impedance. The IVS column speakers are monitored by a refined impedance measurement, so the system is able to detect open circuits, but also the smaller failures.
