Vad bra, tack!
Klipper in resultatet:
So, what conclusions can be made from the analysis of that bulk of diagrams?
1. For the iron core coiles there is a tight correlation between a distortion level and current through the coil.
2. The distortion of air coils don't depend on the current.
3. Frequency responses of iron core coils and air coils in the frequency range up to 5 kHz almost do not differ from each other.
4. When frequency goes up from 20 Hz to 500 Hz the distortion of iron core coils slightly increase. For example, distortion of 5 mH cored coil increase in 2 times.
5. The minimum non-linear distortion level of one of the best in this regards speaker Lambda Acoustics TD15X at voltage level 11.2 Volt, which corresponds the current level about of 1.5 Ampere, is -50 ÷ -53 dB. At the same time the distortion level of 3.3 mH cored coil itself is -80 dB, and -76 dB for a 5 mH cored coil. Even at increasing current through the coil up to 8 A, which corresponds the power level in the load about 512 W, the cored coil distortion don't exceed -59 dB.
All this says about the iron cored coils like Sledgehammer Steel Laminate AWG15 and Mundorf MCoil FERON can certainly be used in LF circuits of high quality crossovers of loudspeakers, which incorporate the most linear LF speakers, without any risk to spoil the sound quality.
Då kan man ju bygga passiva ekvalisatorer.
nä, kanske inte men trevägare är ju möjliga trots allt.