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Be, if you look at the picture of the S2 then you will see that between the exit of the phase plug and beginning of throat there is a circular channel that violates my view of proper transition in compression driver. This channel is on the side of the throat exit and it more looks like an added volume to post-compression front chamber. The pressure from throat in the way forward toward to the exit does not pass this channel as the channel is almost behind. I never liked this channel, I wrote about it before and I meant to patch it. How it affects sound I do not know. In context of this there I think it is worth to note that this channel is a few mm deep and it does not got all the way across the poll and is not connected with the chamber where the magnet is. So, regardless what kind magnet it would be permanent or electromagnet it would not be relevant from THIS perspective. Again, I do not insist that there is no vent from sound cavities to magnet cavities but I would not like it is. If it was true then the magnet chamber size would be certainly the factor.

BTW, I read recently a feedback for one guy who invested a lot of time in the electromagnets and he has many of them (I think he is associated with Rulit). I do not particular care about his views one of his comments I find interesting. He claims that his electromagnets drivers, being driver from all warned up amp, begin to sound in the way he likes only after 1 hour of operation. This would perfectly comply with the idea of the electromagnets to sound different due to heated magnet structure. So, hypothetically, if we a medium magnet that do not loose magnetic force with temperature and if you wind a heating coil over it with a thermostat, then we would get the same effect. Now, the bigger question would be if the effect is positive in any way. One of the thing that I would like to repeat with my electromagnet is to use non-plastic cones. I had worse sound with electromagnet but was it due to the fact that plastic suspension of the S2 diaphragm got warmed up?

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