So linearity of components isn't useful??
I have done so, but I'm afraid you would never understand it.
hmm..a discussion of the non-linearity issues related to fabrication of inductors typical of passive speaker crossovers is now called "piecemeal criticism"
Gee, what's it called when we discuss resistance??? Futile??
jn
No, I wouldn't be surprised. My expectation is that you would understand less than half the concepts involved.
Ultrasonic welding, matched expansion epoxy, 11 dimension motion control, multi-dimensional spacial remapping, quench propagation, multipole harmonic generation via circular modulation, ramp rate quench effects, current crowding within a superconductor, triple R...to name some of the simpler things.
What I do everyday is so chock full of high falutin concepts, buzzwords, and acronyms, that normal conversation really doesn't exist here..
(nor does a readable CV/resume exist here.)What I can do, is discuss here the stuff that really matters in audio, and feed down stuff that I larned in da course of my work. What I've been posting here about inductor non-linearity is a simple subset of the stuff I have to deal with.
Edit: Oh, and ps..iron core inductors for high end may be a step up if air core solid wire coils were used, it depends on so many details. Of course, that is engineering detail oriented, which you do not like. You've stated that you only want to discuss the 'concept' sans detail.
jn
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No can do JC..
It's too detail oriented.
B'sides, I do not own it, and there is proprietary information which others may find, shall we say, useful..
Let's stick to stuff you'll understand, eh?
jn
You do understand that while my remarks may appear to you to be either random or magic (Arthur C Clarke), they are not.
If you wish to understand the magnetics, either pick up a good book, or ask questions. I've no problem answering them. In fact, quite a few people here can help you understand.
jn
It is not classified per se. It is however, proprietary in that I cannot divulge some of the concepts. We have an edge, and no reason to give it away.
The concepts I discuss on this forum however, are my personal IP. As such, I can give it to all freely, and help steer others to duplication of results.
jn
Worse, some butt up coils on wafer thin boards in 100K+ speakers
Laminate core , only in the bass and at power levels 50% below saturation, never on the mid-range , foil or aircore only. Non linearity in AC, means plenty testing back and forth , Foils are completely different and will require different approach...Attachments
Worse, some butt up coils on wafer thin boards in 100K+ speakers
From the looks of it, that wafer thin pc board has lots of copper on the back. The coils flat to the board will have lower inductance and will go resistively non linear at close to half or a third of the intended crossover frequency.
Sheesh, don't they read Maxwell, or even lenz?
jn
I hope Richard conducted his tests in a proper way, as these gentlemen certainly did theirs in the wrong way.
Their problem shows in Fig. 6.10 d and for me is verified by Fig. 6.10f .
The measurements at the loudspeaker input terminals show a HF signal much stronger than the (to be) measured signal, the former modulated by the later.
These seem to be HF signals picked by the loop formed from the speaker cable return and the measurement instrument(s) ground connection (power feed cable).
Just compare Fig.6.10b (RG59 coaxial, proper connection) to Fig. 6.10f (RG59 coaxial with screen to hot and core to ground).
The worsening of the signal at the loudspeaker input terminals is much exaggerated (or created) by improper test set-up.
These engineers don’t even consider the possibility of creating a loop while testing, let alone measure loop area and try to minimize it.
The HF noise shows on all measurements, see the ripples riding over the square waves. They should have tried to measure the strength of it in the first place.
Note on competence: See also Fig. 6.16. They simply state: “Vertical scale not calibrated”.
How one can validate what they show? How many db/div?
Publish or perish.
I live ~5km away from radio FM and TV transmitting antennas.
In my cave the noise level across 1MHz-200MHz picked by a 2m horiz wire into 1Mohm/20pf is flat –52dBV.
The noise level across 100kHz-200MHz picked by a 36m loop wire into 1Mohm/20pf is flat –54dBV.
All these are ~20dbV above the noise floor shown with instrument's input shorted at the BNC .
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies and wire strength
George
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