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What the sonic impact will be? I clearly have no idea.  I was slightly desponded and warned that my excremental S2 with electromagnet did not have the “sonic impact” that I find useful.

Regardong the Quartopuss... Chris, you're confused because the front panel made transparent just for sake of the illustration.  The front side is not just a circle but a solid plate with a hole in a middle that short the coils. So, we have 3 coils on return pass and one coil around the center poll piece. The reason to go for multiple coil is because I would like to keep the driver shorter, effectively reducing the begging of the horn form 190Hz to 400Hz

(as I told in the http://www.goodsoundclub.com/TreeItem.aspx?postID=1929#1929)

Form one side I need to have enough core mass for the coils but from another side I do not have enough length between the exit of the horn as a diaphragm. So, I figured out that I have 3 options:

1) Go for a multiple coils (it is expensive as it should be disableable to mount the coils, but is effective for cooling)

2) Made another horns for 2’-3’, making the driver longer (too mach hassles)

3) Do inverted driver, or what Cogent does, putting the diaphragm on front and the putting field-coil on the drivers back. This is the most propionate direction to go but it is basically will force to make a completely new driver.

Frankly speaking the objectives of mine were not to built a new driver but to see what S2 will be able to do with electromagnet – juts a delta between the magnet types. There is a lot of unexplored grounds in making own drivers but it is not what I have interest in, I am comfortable with what my normal S2 do. I was looking for inspirations to find something “out there” when I was flying to Vegas last year - pretty much to hear what Cogent ended up was my main reason to visiting Vegas last year. The Cogent was not conclusive and I went to my own S2 electromagnet modification. What I heard was good or bad but defiantly NOT at the level what might suggest me to modify my entire Macondo in order to accommodate a field-coil driver.

BTW, if you wish, as I told, I might send you the field-coiled S2 (with the cone) and you can play with it yourself. Regardless that I did not find it prospective so far I still assure you that it will be an educational experience.

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