If you go to this post on his loudspeaker thread, you will see the crossover for the speaker in question has a few 6-way switches, one of which swaps various inductors in the tweeter circuit.
I understand that a current through a coil establishes a magnetic field around that coil. I don’t think nearby coils have to necessarily also have current through them to cross-talk, though that definitely increases the strength of the coupling.
I understand that a current through a coil establishes a magnetic field around that coil. I don’t think nearby coils have to necessarily also have current through them to cross-talk, though that definitely increases the strength of the coupling.
If the circuit does not flow, there is no current to create or interact with a magnetic field. It is not just the tweeter circuit I could switch out. I have DPDT for the central junction in a 3rd order arrangement on the woofer's lowpass as well. This means all coils not selected are not sitting with current flowing through them to interact with the other magnetic fields around them. The tweeter used SPDT switches as only one pole was needed.
I also believe that adjacent coils need current flowing to allow crosstalk. If you have one coil magnetically couple to another that is not in the same circuit, and the secondary coil has a load (as in both leads are terminated to a load), then crosstalk is possible into the secondary circuit. If there is no way for both coils to flow current, then it can't affect the adjacent network.
I also believe that adjacent coils need current flowing to allow crosstalk. If you have one coil magnetically couple to another that is not in the same circuit, and the secondary coil has a load (as in both leads are terminated to a load), then crosstalk is possible into the secondary circuit. If there is no way for both coils to flow current, then it can't affect the adjacent network.
I'm going to jump back in here rather than start a new thread, because I still want to understand more about inductors, not just the how but the why of what they are doing in a circuit. The posts here have been educational, but some of you guys are pretty advanced in your knowledge and I've been trying to keep up. So let me go back to square one and pose a question:
If I want to swap out the existing 20 ga solid air core (perfect lay, .68mH, .40 DCR) for a Jantzen wax foil 16 gauge (.68mH, .3 DCR), what should be my concerns if any, about the lower DCR? Which is more important, the 25% decrease, or the actual .1R? I have a very basic grasp of the idea that increased direct current resistance would lower the output of the inductor, and may increase rolloff but also SP levels of varying frequencies, is that correct? What I'm not clear about is if the inductor is in parallel, and the DCR is reduced, would this nudge the xover point down just a bit because I'm basically lightening up the choke resistance and allowing a slightly wider frequency band to pass?
It's not clear to me what the difference is between the main resistance rating of an inductor, and the DCR, how the two forms of resistance are different, particularly when implemented in parallel as opposed to series.
I know that's a big coil of waxed copper to sort out, but if anyone could chime in for a newbie to this world, it would be much appreciated. I've really become fascinated by how complex the world of speaker design really is, and have great respect for those who've managed successful designs, especially with budget constraints. A year ago I bought a soldering iron and made some cables. Last fall I built my first set of kit speakers. Now I want to tear open my amp, dac, and preamp and see what the hell is going on in there........might take a minute. I've tried to search for these answers on the net and in forum posts, but what I find is either very specific (and then usually veering off topic in endless debates), or seriously math oriented, and too far ahead for me currently, though I did do heavy math and science a long time ago so I can handle the algebra when the time comes.
Apologies for so many words.
If I want to swap out the existing 20 ga solid air core (perfect lay, .68mH, .40 DCR) for a Jantzen wax foil 16 gauge (.68mH, .3 DCR), what should be my concerns if any, about the lower DCR? Which is more important, the 25% decrease, or the actual .1R? I have a very basic grasp of the idea that increased direct current resistance would lower the output of the inductor, and may increase rolloff but also SP levels of varying frequencies, is that correct? What I'm not clear about is if the inductor is in parallel, and the DCR is reduced, would this nudge the xover point down just a bit because I'm basically lightening up the choke resistance and allowing a slightly wider frequency band to pass?
It's not clear to me what the difference is between the main resistance rating of an inductor, and the DCR, how the two forms of resistance are different, particularly when implemented in parallel as opposed to series.
I know that's a big coil of waxed copper to sort out, but if anyone could chime in for a newbie to this world, it would be much appreciated. I've really become fascinated by how complex the world of speaker design really is, and have great respect for those who've managed successful designs, especially with budget constraints. A year ago I bought a soldering iron and made some cables. Last fall I built my first set of kit speakers. Now I want to tear open my amp, dac, and preamp and see what the hell is going on in there........might take a minute. I've tried to search for these answers on the net and in forum posts, but what I find is either very specific (and then usually veering off topic in endless debates), or seriously math oriented, and too far ahead for me currently, though I did do heavy math and science a long time ago so I can handle the algebra when the time comes.
Apologies for so many words.
In order to show you the difference simply, can you show us the circuit and the impedance plot for the driver in question...
Copyright material removed.It's a great starting place due to its simplicity. I think it's a second order, is that correct?
If this sim is anything to go by, the difference (0.4 vs 0.1) is small. The resonance is a little stronger, almost identical to increasing the capacitor to 7uF instead.
Thank you Allen, although I think you may have misread the values - it's .4 vs .3, the difference was the .1. If I use the 16 gauge foil. If I go up to the 14 gauge, the DCR drops to .21, doubling the difference to about .2. If you plotted a .3 difference and it's such a small shift, I guess .2 is not a worry?
At this point I think I'll go up in gauge to the 14 unless there's a reason not to.
FWIW, I built the Auricles and later upgraded the capacitors to Mundorf Supremes. There was an increase in clarity and the sound stage widened up a bit. I do only have about 50 hours on the new caps.
My kit came with iron core inductors for the woofer and have been thinking about changing these out to an air core but just haven't gotten around to it.
Cheers
My kit came with iron core inductors for the woofer and have been thinking about changing these out to an air core but just haven't gotten around to it.
Cheers
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I was lucky enough to be given a pair of these tweeters. From the capacitor used on the high pass the tap provided with kit is 9.0 ohm? I am trying to incorporate these in a personal project but need to pad them down to about 84-85 db And any info is appreciated.
I think you'll have to call or write Meniscus, I'm pretty sure this version was tweeked on Jeff's request, and I've seen the basic iteration with variable taps, these had nothing but solder tabs.