class d output inductors, toroid or gapped ferrite ?

[Tekko]

I cant really find anything on this so here goes:

Which is best, a toroid like T106-2(or other number) or a gapped RM or ETD core type ferrite ?

Hypex seem to like the ferrite better than toroids.

[Tekko]

I meant which is preferred on the forum.

[lumanauw]

I remember that there are several threads discussing about classD output inductors. One thread have reports comparison between different inductors and prefer the Wurth Elektronik one.

[Tekko]

I looked around in the wurth elektronik inductor stock and found this one rather interesting: http://katalog.we-online.de/kataloge...7447709220.pdf

I don't really like toroids because of their size.

[Tekko]

I have ordered a few free samples, now it remains to see if they will give me any.

[Tekko]

http://www.we-online.de/katalog/medi...4435572200.pdf <-- perhaps this one would be a good one too, it takes higher current and should therefore be more suited for higher power amplifiers.

[stoc005]

I think gapped or non-gapped does not matter. What does matter is magnetic material and DC resistance of the copper wire used to make the inductor.

[theAnonymous1]

Originally Posted by stoc005

I think gapped or non-gapped does not matter.

Ferroxcube seems to think differently.

http://www.ferroxcube.com/appl/info/...0amplifier.pdf

[infinia]

Yes it matters were the gap is and how the magnetic circuit is designed for shielding against EMI or radiated noise pollution. I think they are all gapped. Ferroxcube is selling its powder iron toroids which are made with a "distributed gap". Yes they are low loss but this is much worse for EMI than a constrained central gap with an outer ferrite structure.

[sendler]

Originally Posted by infinia

Yes it matters were the gap is and how the magnetic circuit is designed for shielding against EMI or radiated noise pollution. I think they are all gapped. Ferroxcube is selling its powder iron toroids which are made with a "distributed gap". Yes they are low loss but this is much worse for EMI than a constrained central gap with an outer ferrite structure.

The Ferroxcube toroids have a real gap, the Micrometals type 2 toroids that are so popular because they were speced in the original papers by Tripath are made of E-carbonal and have the gap distributed through out the mixture of material. The Ferroxcube cores sound better but have a slightly higher loss, "play" the music signal audibly from vibrating like a phono needle, and emit EMI from the gap almost as much as an air core which has the lowest loss. The type 2 cores sound only just ok and are often used in a much too small size for the power rating of the amp. The best sounding coils I have found after listening to many different ones are the Wurth WE-PD XXL coils but they have a much higher loss in the low values I prefer.
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http://katalog.we-online.de/kataloge...7447709004.pdf
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See the other threads.
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Coil Pile
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Sure Electronics New Tripath Board tc2000+tp2050