Kay Pirinha
03-08-2019, 02:59 AM
Hello,
the 4430 crossover requires a 40 µH choke in it's variable 17.8 kHz bandpass section that features remarkable improvement in the 2421a/2344's high frequency response. Air inductors of this value are hard, if not impossible to source these days. So what to do? As far as I see, there are the following options:
- Buying 50 µH air core inductors and modifying them by decreasing the turns number to Nrequired = Nstock/sqrt (50/40).
- Combining a 50 µH stock inductor with a capacitor of reduced value (2 µF -> 1.6 µF).
- Modifying stock 100 µH or 50 µH chokes on toroidal ferrite cores by reducing their turns number according to the abovementioned formula.
Which one would you prefer?
Thanks and best regards!
the 4430 crossover requires a 40 µH choke in it's variable 17.8 kHz bandpass section that features remarkable improvement in the 2421a/2344's high frequency response. Air inductors of this value are hard, if not impossible to source these days. So what to do? As far as I see, there are the following options:
- Buying 50 µH air core inductors and modifying them by decreasing the turns number to Nrequired = Nstock/sqrt (50/40).
- Combining a 50 µH stock inductor with a capacitor of reduced value (2 µF -> 1.6 µF).
- Modifying stock 100 µH or 50 µH chokes on toroidal ferrite cores by reducing their turns number according to the abovementioned formula.
Which one would you prefer?
Thanks and best regards!