Biro Technology

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Biro Technology is a small company dedicated to developing cost-effective high-performance audio solutions. Best known for our standard-setting loudspeaker designs, we are also active in the area of audio electronics design. We offer our services on a consulting basis and occasionally market solutions under our own Biro Technology brand.

S ince the 1970s, the most common place for a loudspeaker system's high-frequency driver has been horizontally smack-dab in the middle of the cabinet and in-line with the low-frequency driver. This arrangement has the benefit of producing a completely symmetric cabinet, meaning that the manufacturer's production is slightly simplified and, perhaps more importantly, the need for the manufacturer--and retailer--to inventory systems as mirror-imaged stereo pairs is eliminated.

MAKING IT USEFUL. Given a driver of known Fundamental Parameters, we now know how to modify it to produce the desired sensitivity. Unfortunately, most spec sheets and design methods are based on T/S parameters, not the Fundamental Parameters we've been using so far. Our next step, then, is to develop some means of connecting the T/S data speaker builders are accustomed to working with to our Fundamental Parameters. This is turns out to be a lot simpler than it sounds because the T/S parameters are actually based on Fundamental Parameters.

One obvious course of action was to modify the performance of a selected off-the-shelf driver to meet my needs. Speaker Builder authors have previously dealt with modifying drivers using series resistance and by adding mass to driver cones [1],[2]. While these articles have presented some general rules of thumb for determining how a given resistance or mass will affect a driver's parameters, my project required a concise, analytical approach to accurately predicting outcomes. Luckily, it is not impossible to develop such an approach.

Driver manufactures are constantly experimenting with new permutations of basic materials and constructions in an attempt to find (at best) a better compromise for a given application, or (at worst) a product that merely has greater market appeal. Laminates of all sorts, Kevlar® and paper composites, and Kevlar® and plastic composites are but a few of the materials that have recently been made available. As with any new technology, all claims made for or against such new materials must be considered very, very carefully.

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