Hello I am rebuilding my three way crossover with better parts my inductor is 0.50mh but can only find 4.7th or 5.6mm which would be best to replace them with everything will be mundorf inc caps
I would use a 0.47 mH inductor as a substitute for a 0.50 mH inductor.
A variation of +/- 5% from 0.50 mH is quite acceptable, i.e., +/- 0.025 mH (in all but the most precise of crossover requirements).
If you have an inductance meter, you can unwind a 0.56 mH inductor until you get a reading of 0.50 mH, but I don't deem that necessary.
For more focussed assistance, you would have to append your crossover schematic.
A variation of +/- 5% from 0.50 mH is quite acceptable, i.e., +/- 0.025 mH (in all but the most precise of crossover requirements).
If you have an inductance meter, you can unwind a 0.56 mH inductor until you get a reading of 0.50 mH, but I don't deem that necessary.
For more focussed assistance, you would have to append your crossover schematic.
Both are wrong. Inductors don't deteriorate. Unless your existing one is some patently inferior technology like iron core solenoid, no need to replace. If updating, one needs to acquire a decent measuring setup to determine effect on the sound, before changing anything. Astute designers can make real garbage produce artistic sound by counterbalencing different flaws.
If you are buying air coil inductors, an oversized one can be modified by removing some windings to approach 0.5. However you have to measure your progress with a competent meter. Again series resistance should be matched, new to old, and $39 DVM are not accurate enough below 1 ohm to make a determination.
The only natural call to update is the electrolytic cap in the crossover. These are water filled bottles sealed with elastomer, ie rubber. The rubber is attacked by oxygen, eventually cracks, the water vents if there is any heat. Because other technologies have different ESR , even changing NP electrolytics cannot be done blindly without measuring the ESR first, and later the frequency response. Unfortunately with electrolytics you were not there to measure the original ESR before time and heat changed it.
If you are buying air coil inductors, an oversized one can be modified by removing some windings to approach 0.5. However you have to measure your progress with a competent meter. Again series resistance should be matched, new to old, and $39 DVM are not accurate enough below 1 ohm to make a determination.
The only natural call to update is the electrolytic cap in the crossover. These are water filled bottles sealed with elastomer, ie rubber. The rubber is attacked by oxygen, eventually cracks, the water vents if there is any heat. Because other technologies have different ESR , even changing NP electrolytics cannot be done blindly without measuring the ESR first, and later the frequency response. Unfortunately with electrolytics you were not there to measure the original ESR before time and heat changed it.
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"my inductor is 0.50mh but can only find 4.7th or 5.6mm"
Erp. You might want to make sure your looking at the right things here.
mH - th - mm ???
Are you saying 4.7mH and 5.6mH ?
Or did you skip a decimal place and are really saying 0.47mH and 0.56mH
Erp. You might want to make sure your looking at the right things here.
mH - th - mm ???
Are you saying 4.7mH and 5.6mH ?
Or did you skip a decimal place and are really saying 0.47mH and 0.56mH
Any reason not simply going to an active crossover or DSP, especially if you are looking for better sound?
B.
B.
For the premium prices Mundorf is asking, they should be able to deal with the problem themselves. Either adjust inductor to desired value or specify how much of wire should you unwind yourself.
Normally one would first assess the specs of original parts, then decide.
Normally one would first assess the specs of original parts, then decide.
Mundorf can make in between coil catalog value. You need to ask them directly, they charge you of the upper price coil value they unwind on demand imo (I dunno if it is made from scratch with all the post oven treatments though). It is on Mundorf web site.
It should be mH of course. The henry (symbol H) is the unit of inductance.
When a unit is named after a person, in this case Joseph Henry, the unit symbol is capitalised.
Out of interest, xtro, what loudspeaker are you dealing with?
Pedantic bunch aren't we 😀
But when where taking about measurement values...
1x could be 1 inch, 1 foot, 1 millimetre, 1 centimetre, 1 meter, 1 kilometre, 1 fathom, 1 link etc etc etc.
But when where taking about measurement values...
1x could be 1 inch, 1 foot, 1 millimetre, 1 centimetre, 1 meter, 1 kilometre, 1 fathom, 1 link etc etc etc.
So... What's the plan on making it sound better than the original? Better parts? Better topology? Bi-amping / tri-amping? Active XO? Active + passive hybrid?