Hi!
I was wondering if someone has already built a subsonic filter to prevent excessive cone motion.
Using BassBox 6 at the External tab in the Driver Properties window I could experience with capacitor and inductance values but it looks like I would need 200-1000 microFarad and 20-60 mH (3-8 Ohm DCR) values which are very expensive.
As long as I read on other forums that they sell Behringer 2×3 way active crossovers for $200 I'm not shure the passive is the right choice.
Daniel
I was wondering if someone has already built a subsonic filter to prevent excessive cone motion.
Using BassBox 6 at the External tab in the Driver Properties window I could experience with capacitor and inductance values but it looks like I would need 200-1000 microFarad and 20-60 mH (3-8 Ohm DCR) values which are very expensive.
As long as I read on other forums that they sell Behringer 2×3 way active crossovers for $200 I'm not shure the passive is the right choice.
Daniel

Not to mention that it's much easier to build a steeper active filter and you do not suffer from wavering frequency response nor lack of damping at the cutoff frequency.
You can even build a nice neat active subsonic filter complete for under $50 all in, and that's being generous.
You can even build a nice neat active subsonic filter complete for under $50 all in, and that's being generous.
re passive filters
If you are making your own power amplifier you can get a second order high pass filter by choosing the value of the input coupling capacitor, and the capacitor that shunts the feedback leg to ground. This has a fixed Qt=.5, and is suitable as a part of the SC6,C6, QB5 class III alignments.
If only a single capacitor can be used then this can be part of a B5 alignment, in practice a back to back pair of electrolytics that has a nominal total capacity of around twice the one called for in theory will give a result that only varies by a few db. from the ideal if put in series with the driver, this can also be used as a second order filter if you choose an input coupling capacitor that is equal to the theoretical value.
If you are making your own power amplifier you can get a second order high pass filter by choosing the value of the input coupling capacitor, and the capacitor that shunts the feedback leg to ground. This has a fixed Qt=.5, and is suitable as a part of the SC6,C6, QB5 class III alignments.
If only a single capacitor can be used then this can be part of a B5 alignment, in practice a back to back pair of electrolytics that has a nominal total capacity of around twice the one called for in theory will give a result that only varies by a few db. from the ideal if put in series with the driver, this can also be used as a second order filter if you choose an input coupling capacitor that is equal to the theoretical value.
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