There is this guy. $13
https://www.parts-express.com/Jantzen-1982-5.0mH-20-AWG-Air-Core-Inductor-255-060?quantity=1
DCR of 2.3 ohm, is that too high? I read there was an unwritten rule about not going above 5% of the Re of the driver, but then why would they make this inductor, that would be over 40 ohms for an Re. I just remember people saying that air core is better for midbass and higher frequencies.
Dan
https://www.parts-express.com/Jantzen-1982-5.0mH-20-AWG-Air-Core-Inductor-255-060?quantity=1
DCR of 2.3 ohm, is that too high? I read there was an unwritten rule about not going above 5% of the Re of the driver, but then why would they make this inductor, that would be over 40 ohms for an Re. I just remember people saying that air core is better for midbass and higher frequencies.
Dan
There is a 4.78 mH in parallel with the tweeter coil and a 4.78 mH coil in series with the midbass compression drivers.
Oh yes, that is a good option for the woofer, thank you. I’m mostly stuck on the 4.78 coils for the tweeter and midbass, I’m thinking aircore would be better there.
Dan
This compares using a 2.3 ohm inductor to one much lower. The difference isn't large...
1. on the lower tweeter (HF). The crossover frequency goes up.
2. on the upper woofer (LO).
The datasheet for the EV 18WK shows a voice coil DCR of 3.2 ohms. The ad posted earlier states the low pass crossover point is "200 cps". I believe the 4.78mh inductor was chosen for a 6 ohm load, because a 4.78mh inductor at 200hz is 6.0067 ohms. Someone really liked their decimal places!
Slightly OT, but this midrange arrangement is really unusual. At first I thought they feed folded bass horn though those ~cylindrical transmission lines, but looking at additional photos I realised they have their own 180 deg folded exponential horn, not unlike a megaphone, into which upper midrange and HF horns are nested.
