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Re: Crossover Frequency vs. Slope Question for Ribbons

Posted by neolith (A) on October 23, 2006 at 16:36:17

In Reply to: Re: Crossover Frequency vs. Slope Question for Ribbons posted by JP van Son on October 23, 2006 at 11:23:53:

Looking briefly at the schematic, I see that that bass and mid bass are 2nd order filters(12db slope) low pass filters. There is no mid-bass high pass filter, which means the mid-bass is not limited at its lower end and overlaps the bass. Usually the mid-bass would have a band pass filter (i.e a high-pass and low-pass defining the lower and upper limits). It may be that the mid-bass is inverted in order to produce a flat acoustic response in the area of overlap. Further analysis is not possible since the inductor values are not specified.

You are correct that by using a 2nd order high pass filter, you could lower frequency. Interestingly Magnepan typically uses a 2nd order high pass filter on the tweeter but they employ a low Q (often <0.3) so the slope is closer to a 1st order curve. I assume they have a reason for this. Also whether you could lower the ribbon frequency may not depend on the ribbon responding at lower frequencies but more on its ability to move enough air to keep the response flat.

I may be an egoist but at least I don't talk about other people.

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