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deemon wrote:

Hello , Roma ! I think that you can use only a back chamber with decreased size , and a serial capacitor . I think that there are no ways besides  ...

Actually it would be a serial coil, as I need a low pass not a high pass.

Unfortunately the back chambers, for what I need to accomplish, are worthless. The back chambers are very affective for lower knee of roll-off but they do nothing with high knee. Well, they do provide very-very-very minute effect for a natural HF roll-off of the drivers loaded into the horns but considering that I need to cut the frequencies in the very middle of the range (of actually in the beginning of the range) the back chambers are useless.

I still have no idea how to roll it off abruptly without going to a separate amp and a high order crossover (I can’t change driver). I wonder it would be possible to construct some kind of active wall within a back chamber that would be sitting inside of own sealed chamber. The wall would have a heavy equalized driver running in contra-phase to the main deriver… I think this would help to actively damp the LF but not the HF. I think for killing HF I would need to use an EQed contra-phase transducer inside the bell of the horn… Of course no one would be able to say how this will sound… Most probably it would be horrible… or at least it certainly will me more harm then utilizing 4th order filter :-)

I juts do not know at this point any other solution and I’m just purely fishing…

The Cat

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