Announcement
Collapse
No announcement yet.
Inductor placement - Overnight Sensation TMM crossover
Collapse
X
-
The distances you stated between the inductors, is that center to center or perimeter to perimeter? The reason I ask is that quite a few years ago (2013) I made measurements of mutual coupling and crosstalk between inductors to determine to my satisfaction how much distance was needed from perimeter to perimeter of air-core inductors laid down flat like the pair on your proposed board. I found that as long as that distance was no less than 2 inches, there would be no problems. So the two coils you show laid down flat will be perfectly fine if the 3" distance you stated is between perimeters. And, since the other coil is turned up and rotated as shown that should be okay, too, with a 1.5" distance (although I did not make measurements for that arrangement in my tests). I assume if you want to dig it up, you might be able to find the thread from 2013 to get the details.
Paul
Edit: I found that thread here: http://techtalk.parts-express.com/fo...ductor-spacing
Edit 2: I also did a follow-up thread regarding voltage crosstalk between inductors. I did find that thread but my opening post is blank and it was this: Inductor crosstalk.doc
Edit 3: Here's the link to the crosstalk thread: http://techtalk.parts-express.com/fo...ween-inductors
Attached Files
Comment
-
Thanks Paul,
I had read your threads on crosstalk before posting but the small coil was a spanner in the works as it was less than 2" from the other two coils (diagonally between perimeters). That is why I placed it upright and rotated 90°. Most references I have seen show a coil like this as being postitioned upright, rotated 90° and in line with the center of an adjacent coil. If I move the small coil to the right (down in my pic) to line up with the center of the largest coil they would only be around 0.5" from each other, so I opted to position the small coil between the other two as I figured the greater the distance between the coils the better. I could not find any references for this arrangement however.
The two larger coils are 3" betweeen perimeters but in my pic only one is laid down flat, I am guessing having one upright won't hurt given the 3" spacing.
It was a pic you posted of a crossover in the base of one of your speakers which lead me to wanting to position the crosssover on the cabinet floor but with only 8" x 4.5" things got a little tight re inductor placement.
Thanks again, John.Last edited by 01-0077; 05-23-2021, 08:12 AM.
Comment
-
Yep, the fact that one of the larger coils is stood up is fine and the 3" spacing is a bonus. Other than a pair of large bookshelf speakers I built for my workshop, I only build floor-standers for personal use, so I usually have lots of room for a single crossover assembly with all of the air-core inductors laid down flat and at least 2" spacing between perimeters.
Paul
-
Comment