check this out stereo ive not seen magico using a activemagnet system with 7 kg copper coils per unit , and with the copper price these days .
http://www.grande-utopia-em.com/en/technologies/em.php
http://www.grande-utopia-em.com/en/technologies/ial2.php
Ls speakerenginering is all about performance / cost ,iirc jm labs was working wih berylium diagphrams long before the others
The Focal idea to use coils to create a magnetic field has been around for a long time... It has been neglected (even in professional audio) long time ago for several reasons:
1) usages of wall electrical based power supply create new limitation: noise , modulations and other artifacts not present in any conventional driver
2) The goal of increasing the absolute values of the magnetic field for bass driver doesn't make any sense.The target of all bass drivers is to go low in frequency. How low you can go is determined by law of physics, which says there is a direct correlation between 3 parameters , the size of the box , the sensitivity and the -3db point you want to achieve. If you want to achieve certain - 3db in a known box size your sensitivity is given! Increasing the sensitivity beyond certain point ( which is completely doable using permanent magnet like Focal is doing) will increase the -3db point , and limit the speaker low frequencies.
3) Focal is using basic overhang structure with minimum usage of copper rings, low X max , small voice coils, high inductance. This is really what limits the functionality of their bass drivers as it causes compression and distortion.
Overall, more of a marketing trick than anything else...
Problem is that 99% of audiophiles do not understand anything about physics- that's why OEM websites and forums are full of marketing bullshit.
Some people will tell you for example that Wilson use top of the range drivers. But look at their mid-range:
-They are well designed mid priced drivers ( 50 - 120 cost to oem) from SB acoustics
- Basic overhang structure with min usage of copper rings
- They use paper cones which give the best compromise at low cost
Overall, not a bad driver, but a cheap compromise, something I would expect on my 3k Usher Dancer Mini. not something you expect in a 50k speaker...
Now compare with the Magico mids being used on the Q3, or even with the driver of a 12k speaker like the S1:
1) underhand motor system (much more expensive ) reduces the distortion and IMD in the band pass
2) massive copper sleeve ( much more expensive than shorting rings) again reduces distortion and IMD
3) N48H full ring magnet (no magnet segments usage which costs fraction and clearly don't have the magnetic smooth behavior of full ring magnets)
4) Huge 77 mm voice coil , Inductance is almost none measurable plus give the cones best mechanical support. It also reduces thermal effects
5) full cone , no use of dust cup , the only way to keep the structure integrity (unfortunately complex to assemble)
6) Cone made of the most advanced carbon sandwich with foam layer in a unsymmetrical structure.
I don't know the cost as it is a custom design, but from seeing the way the driver is built, I would estimate it at a minimum of USD400-500, i.e. more than 10 times the cost of a Wilson mid.
Magico philosophy is of "no compromise". As an engineer, I personally buy into their technology choices and I hear the difference, that's why I switched to the brand from EA (and many other brands including Wilson in the past).
Not sure why I am losing my time trying to have a fact based discussion- it doesn't interest most of the people on this forum anyway! And when some people put facts on the table, 80% of these "facts" have no scientific foundations... depressing!