From TalkBass Wiki
[edit] Crossover for fEarful 12/6 using Eminence Kappalite 3012LF and Eminence Alpha-6A
Caution: Using two fEarfuls with this crossover design with some heads, the load may be lower than they like. Impedance sim for one cab drops to 4.5-4.8 ohms briefly at just above 200 Hz. In effect an enclosure with this crossover could be considered a 6-ohm cab. Not an issue with pro power amps rated for two ohms, but something to be aware of with amps/heads with 4-ohm minimums in their ratings, or ones that are marginally designed. Further clarification here.
- Crossover frequency is ~700Hz
- LP is 2nd order
- HP is 3rd order
- Zobel circuit in parallel with mid driver to flatten impedance curve
Schematic:
Assembled crossover:
Parts I used in my crossover were all made by Intertechnic, prices from Finnish shop called Hifitalo:
- Corobar coil 2.70mH 1.4mm - 16€
- air core coil 1.20mH 1.0mm - 8.50€
- Audyn Cap capacitor 68uF 400V - 26.50€
- Audyn Cap capacitor 47uF 400V - 20.50€
- Audyn Cap capacitor 15uF 400V - 7.90€
- Audyn Cap capacitor 8.20uF 400V - 5.80€
- ceramic resistor 8.20 ohm 20W - 2.50€
Total costs 87.70€
FR and impedance simulation using Eminence-supplied driver datapoints:
back to Fearfulâ„¢ 12/6 & 15/6
