Several cardioid subwoofer configurations exist, but the method to be followed, as described here, is always the same. This article does not intend to assess the various configurations, but only to show the basic procedures and ease the learning process. The user should choose the most appropriate configuration for the specific application needs.

Author: Joan La Roda, DAS Audio, Engineering Department

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FFT based field measurement systems have made it possible for us to do phase alignment at fixed installations as well as at live events, where every venue demands a different approach. This is particularly important these days, since mid-high boxes are often flown and subwoofers remain on the ground, meaning that phase differences at the listener location can be very significant. Given the interest in the subject, and the remarkable improvement it can bring to a system, it seems like a good idea to write an article that describes the measurement process step by step. Before doing that, however, let’s go over the concept of phase.

Author: Joan La Roda, DAS Audio, Engineering Department
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Line arrays have been specially designed so when several units are combined vertically the whole system behaves as one single sound source. Generally speaking that’s what makes them different from the conventional speaker systems. But how do they work? This article develops the principles behind the line array theory for a complete understanding of what line arrays are.

Author: Joan La Roda, DAS Audio, Engineering Department
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DASaim™ is based on FiRmaker technology by AFMG. It is already integrated within the V3.52 GLL library of the AERO-40A, AERO-20A and AERO-20A-120 systems used in EASE Focus V3 – the acoustic simulation and modelling tool used by DAS AUDIO.

In order to achieve the desired results, DASaim™ designs custom FIR filters for each cabinet in an array, which allows unprecedented control of the overall behavior of the array.

Author: DAS Audio Engineering Department

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An advantageous approach to DSP equalization of loudspeakers is proposed in this paper adopting spatial averages of complex responses acquired from 3D balloon measurements. Alignment of the off-axis impulses responses with the on-axis impulse responses are accomplished using a cross-correlation technique prior to spatial averaging to attain meaningful statistics of magnitude and phase responses.

Author: Victor Catalá, Engineering Department

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A method based on the alignment at different angles within a listening window to get a representative median level and phase correction, and posterior phase optimization based on maximum average level at crossover frequencies is presented. Forcertain designs, this method can provide better radiation pattern at crossover, better average level response within the intended listening window, and smoother directivity transitions between ways.

Author: Victor Catalá, Engineering Department

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