A two-way with Scan-Speak 8542-05 and Vifa D25AG 35-06
By Lars Mytting
31 Dec 1996
The Second Crossover
I wanted to keep the advantage of the low crossover frequency, and to keep the "forward" midrange, but mute the harshness caused by the woofer cone breakup. This was done by adding a paralell LC circuit of 5.6 uf and 0.3 mh:
--- 1,9 mh ----+-----------+---------- +
| |
| 5.6 uf
10 uf | ScanSpeak 8542-05
| 0.3 mh
| |
---------------+-----------+---------- -
---------------10 uf---+----3.9 ohm--- +
|
0,8 mh Vifa D25AG 35-06
|
-----------------------+-------------- -
This makes the slope steeper, and mutes the breakup at 2000 further down. It worked very well. The midrange was "softer", without losing detail. Some records may still sound a bit hard, but this is a result of the relatively loud midrange. It's a design choice. Some other crossovers were also tested, but my friend, which I built the speakers for, insisted on using the 12 db filter. "No, I want that folklorish sound, even if it sounds a bit hard on some records" he said. (Any better sound adjective than "folklorish" is rewarded $5!) He has a older and darker sounding equipment, and plays mostly classical recordings. The speaker cannot be said to be "neutral" (which speaker is?), but brings life into recordings which on his former system sounded dull an uninspiring.
I will suggest that you try different crossovers for yourself, but you should definately try out a low crossover frequency on this Vifa dome.
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