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Re: Bastanis


the small 8"- Supravox offers a good midrange but will never produce midrange- adequate, fundamental basses in a sealed enclosure or on an open baffle. There are two possibilities:

1) Adapt the Dragonfly- cabinet for the Supravox, this should work for your room and placement, also it is downfiring!

2.) When the max. distance to the backwall is fine for a dipole open- baffle (you can try this first with a cheap platter, when the midrange shows more air and details without new disturbing "peaks" it is fine) you can combine them with active woofers.
You will need two woofers because the widebands will show an early falling graph on an open baffle and the crossover- point will be around 200Hz - 300Hz (depending on room, placement and baffle- size) using the natural roll- off of the widebands. When you use a single woofer you will either loose stereo- image (when crossover at around 100 Hz) or you will get a curious sound listening to "bodied" voices, deep midrange from the woofer and the higher frequencies of the voice from the sattelites (when you crossover at 200Hz- 300Hz). You also need to built front- firing woofers and place them close to the widebands for creating a halfways unique wave- front above 100Hz when you want to achieve a satisfying imaging. Your drivers are not specially designed for open baffle- application, the resulting phase in the relatively wide- range crossover- region in combination with an active woofer will not be perfect even when you go for a phase- perfect crossover- design but when you use plate- amps with the possibility to tune the phase there is a good chance that the non- perfect phase- behaviour isn`t disturbing. Choose drivers with a very good lower midrange- sound, they`ll make more "music" than you expect - so better leave the heavy- cone long- excursion path for the woofers. When you use good sounding lightweight cone- drivers you can go for plate- amps with 3rd order- crossover for the woofers, the common rising efficiency of these kind of drivers from the basses to the midrange should result an acoustical crossover of around 12dB which should match ok. with the graph of the Supravox- drivers on the open baffles without filtering these, regard that active filtering the widebands also causes a lack of fine details.

The Dragonfly- cabinets offer extended, fundamental and much more dynamic basses than expected when you look at their tiny size. Your drivers in this setup sound homogenous without all the possible problems caused by small drivers which are not specified for an open baffle- application in combination with active woofers. Feel free to adapt the Dragonfly cabinet- design, you can easy built an inexpensive trial- cabinet first and then decide if you are satisfied or if you want to go on with active woofers.

Prometheus is a proven design, all components are special designed for their application and there is harmony inbetween them, also the crossover- point to the woofers is deep enough to offer homogenous single- driver sound with superiour imaging. Probably it is more easy to switch to Prometheus than to adapt active woofers to your Supravox- drivers with satisfying result.

Please keep us posted.

Robert Bastani

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Follow Ups Full Thread
Follow Ups
  • Re: Bastanis - Robert Bastani 09:32:40 10/30/06 (2)
    • Bastanis - carceivasile@yahoo.com 23:14:15 10/30/06 (1)


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