In This Section
Sound Board: Food for Thought, Aesthetics in Orchestra Recording - April 2015
Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
Reflecting on Reflections - June 2014
AES Engineering Briefs Forum
Time Alignment of Subwoofers in Large PA Systems
In common PA systems the frequency range is divided into different ranges that are reproduced using different cabinets (subwoofers for the bass range and top cabinets for the mid-high range). This means different locations and positions of the sound sources and therefore notches and peaks in the crossover range. Time alignment is needed to adjust the arrival time of frequencies in the crossover area. But it's not only a matter of distance, since the crossover is modifying the phase, too. In this brief, a downscaled model is used to show how to measure the phase difference of a two-source PA system and correct it using FFT measuring software. Two situations are treated: two sources with overlapped frequency response and two sources sharing crossover frequency.
No AES members have commented on this paper yet.
Subscribe to this discussion
Start a discussion!
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.