djdan said:What are your opinions about electromagnetic speakers about quality of the sound ?
This kind of speaker it can be used in active box .
djdan said:Electromagnetic speakers have many advantage but unfortunately the poorest and cheapest standarts win every time in our world.
djdan said:Permanent magnet ? No , no , no ... no ! It is time variable.
2002 95% magnetised .
2003 80% magnetised .
2005 70% magnetised .
2010 50% magnetised .
can a field coil speaker be made by hammering away the ferrite from a conventional speaker? this boils down to the question of whether the pole pieces are attached to each other or held together by the magnet...
Why can not just vary the magnetic field in relation with frequency ?
1)Bill F. said:
Iron and steel have relatively wide hystersis loops, while magnetically soft materials, like Permalloy, MuMetal, etc., have narrow ones. (I don't know about Permendure and the other exotics.)
The common driver recipe (weakish magnet, steel return circuit, high-power voice coil) allows the most hysteresis. The VC field from a heavy transient can reverse the magnetic domains in the return circuit, and even in portions of the magnet. The total field will sag until the magnet has turned all domains back around.
djdan said:An amplifier can't amplify two ore more frequency in the same time. The music is pure sineway. You can read more about that subject on the Rod Elliot articles ( I don't remember what article ).