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be wrote:

This time also make shure that the cavities in the two versions, the alnico and the fieldcoil, have the same size and volume of cavities behind the coil in the magnet structure. In this way you make shure that it is the two magnet types you are listening to and not some irellevant cavity resonance and reverbaration chamber.

Be, I am not sure what you mean. The volume of fieldcoil and core is slightly different then the volume on perm magnet but the cavities behind the coil are not the cavities where pressure passes, therefore I do not think that any resonances or reverberation in magnetizing chamber has any affect to sonic out of the driver.

be wrote:

Maybe the easiest would be to put a fieldcoil into the alnico version also, this would also open up to some experimentations by shorting the coil or even to try the electro-alnico magnet you sugested some time back.

Yes, I had this idea but I do not think that would go into it. Above someone told about an European guy who heated up his permanent magnets and was able to simulate by this the sonic attributes of fieldcoil. In my view it was a sanest thing I heard from fieldcoil crowd. I very much would like to try it myself, but I need a way to recharge the perm magnets as with Alnico the driver would lose magnet force with heating. There is a key in all of it – I do not feel that fieldcoil has any sonic advantages (I feel it is opposite – the fieldcoil sounds inferior) and I do not feel a need to change anything from how my S2 sounds now. However, if the heating up of the magnet would make the difference as expected then it might be a good direction to use “hard” drivers with “loose” cone and “soft” magnetizing force.

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