A two-way with Scan-Speak 8542-05 and Vifa D25AG 35-06
By Lars Mytting
31 Dec 1996
The First Crossover
--- 1,9 mh ----+---------------------- +
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10 uf ScanSpeak 8542-05
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---------------+---------------------- -
---------------10 uf---+----3.9 ohm--- +
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0,8 mh Vifa D25AG 35-06
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-----------------------+--------------- -
The highpass has about the same values as a 1900 hz Butterworth filter, but the lowpass inductor is made way larger to mute the rise in midrange response caused by the baffle.
I found this crossover interesting because it only needed five parts, all with moderate values. Such "ascetic" crossovers usually is a good thing. Another theoretical advantage was to let the tweeter handle a larger part of the frequency range than usual. A tweeter has a way higher acceleration factor than a midrange/woofer, and the low crossover frequency could then lead to a more open and detailed midrange. This was later confirmed.
On the other side, the filter might not mute the breakup of the woofer cone enough, making its sound hard and ear- straining. Also, if the tweeter did not handle all the midrange signal, it would sound distorted and harsh. Anyhow, scientific value of this crossover was high, and since I love the smell of solder tin in the morning, I gave it a try.
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