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Audio Federation have publish some images from the Silbatone room at CES, even it is in their new idiotic format of the “magazine” but they still visible.

http://spintricity.com/445/public/Vol1-3/page182

What attracted me in the images is to see what Silbatone did with this front filter on this driver. It looks like they wanted to cut some front response proportionally to the back response. In past I played a LOT with all imaginable methods to do it. It is quite complex as any front filtration never does what you what but the filtration does also what it wants/ This is kind of complicated ballet to play, balancing the cons and pros. In case of the light cones of compression drivers and front filters it is VERY tricky as any acoustic impedance front-damps the diaphragms. I never was able to found a good solution and then learn to resolve my needs without employing the front filtration.

Sp, here is what I am thinking. Let pretend that Silbatone folks wanted to kill 3dB from their Manger front radiation. They made up a front filter, sort of bandwidth matched acoustic divider, but what if they do not do it? (Let presume that the Manger’s front radiation do not need any front correction) What might be interesting to try is to put behind the driver, right before the horn throat, a chamber, using the back-loaded Manger as a compression driver. The compression chamber might add a few db of the horn gain and by playing with chamber resonances and compression ratio it is possible to do “some” frequency corrections that Silbatone front-filter I am sure doing.

I have to note that it is very tricky to play with but if the right configuration found then I think it “might” get rid the necessity to throw a white flag of the front filters…

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