Grzegorz Matusiak who oversees all of sounddeco's acoustic design work holds an Acoustics Ph.D. from the Wrocław Tech University. His research papers have been published by the Audio Engineering Society and European Acoustics Association. They include work on the application of the reactance transformation method for the design of band-pass loudspeaker systems; 4
th, 6
th and 8
th-order active and passive symmetrical band-pass loudspeakers; fundamentals on loudspeaker radiation vs. acoustic quality plus speaker efficiency. He holds two patents, one on a bandpass speaker device, the other on a speaker dome made from bacterial cellulose. Prior design work includes a role as assistant director of development with the Polish Tonsil Co.; and ongoing work on active studio monitors for
Audio Pro Solutions.
He traces back his love of the acoustics subject matter to Żyszkowski's "Fundamentals of Electroacoustics" text book which he chanced upon in high school. A later useful discovery was a master's thesis on sound radiation from the Physics Institute at Rzeszów university. In his design work, he considers all the usual measurements, radiance resistance and mathematical distortion modeling using non-linear differential equations. He believes that the diaphragm materials of drive units are very influential on the final sound; and that all available tools including critical listening are equally valid and should be exploited together. His Sigma range for sounddeco matured over two years and might have bowed at the 2013 Warsaw show had the team signed off an early results. The decision for the Sigma d'Appolito array was subservient to desired directionality which is optimized for a seated position. With the larger Sigma 4, perfect focus of the five drive units occurs at 3.5 metres. The Sigma 2 is suitable also for smaller spaces. Given currently nude ends on the Sigma 4's bowed baffle, one might suspect a Sigma 6 on the books which would add another mid/woofer to either end of the current line array.