A two-way with Scan-Speak 8542-05 and Vifa D25AG 35-06
By Lars Mytting
31 Dec 1996
Introduction
The speaker did not turn out to become a superior high-end reference, but it is a very lively and "musical" performer. A friend of mine, who bought the pair, is living a happy life with it.
Let me point out that I am not a pro speaker builder. This was my fourth design, and I am convinced that it is possible to make improvements to it. The following might be a starting point for others who are planning to use the same drivers. E- mail me if you come up with something spectacular.
The Drivers
The 8542-05 is a 7" with paper cone. Variants of it is used in the british ProAc Studio 100 and 200 series, and in the danish Avance Alpha. It has a very smooth frequency response to 2000 hz, but then some heavy cone resonances, with a ugly peak at around 5000 hz.
After several computer simulations of different crossovers, I decided to try a simple 12 db filter. This called for a low crossover frequency to mute the cone resonances enough. This puts great demand on the tweeter, which must handle lots of signal, also down in the midrange area. Vifa claims that their aluminium dome D25AG35-06 can be used down to 1500 hz, and I decided to let it be the companion.
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