RIENTRANDO APPIENO IN ARGOMENTO E VISTA LA POCA "PREPARAZIONE TECNICA" DEI CUFFIOFILI CHE HANNO PROVATO AD INDOVINARE LA RISPOSTA AL MIO QUESITO!!!
Vi svelo la risposta....
Le cuffie che ad oggi rappresentano una vera innovazione nello sviluppo del campo "CUFFIOFILO" sono le......
Cuffie INTRAURALI con "DRIVER MULTIPLI CON ARMATURA BILANCIATA".
E' vero che la tecnologia ha visto la nascita nel 1920 in ambito militare (vedi sotto).
Ma soltanto in tempi recenti merito dell'attuale tecnologia di miniaturizzazione, sono stai sviluppati in ambito professionale sino a raggiungere la complessità attuale che vede l'utilizzo combinato di diversi DRIVER CON ARMATURA BILANCIATA inseriti in un unico guscio. Gestiti tramite un micro crossover appositamente sviluppato, in grado di fargli emettere differenti e specifiche gamme audio.
Tutto il resto almeno per il momento è "STORIA"!!!
Balanced armature transducer with armature balanced and exerting no force on diaphragm
Balanced armature transducer with armature torqued and exerting a force on diaphragm
The JH Audio JH16 custom in-ear monitor utilizes 8 balanced armatures in a triple crossover configuration (4 low/2 mid/2 high). Multiple balanced armatures are often used to provide a higher fidelity sound.A balanced armature is a sound transducer design primarily intended to increase the electrical efficiency of the element by eliminating the stress on the diaphragm characteristic of many other magnetic transducer systems. As shown schematically in the first diagram, it consists of a moving magnetic armature that is pivoted so it can move in the field of the permanent magnet. When precisely centered in the magnetic field there is no net force on the armature, hence the term 'balanced.' As illustrated in the second diagram, when there is electric current through the coil, it magnetizes the armature one way or the other, causing it to rotate slightly one way or the other about the pivot thus moving the diaphragm to make sound.
The design is not mechanically stable; a slight imbalance makes the armature stick to one pole of the magnet. A fairly stiff restoring force is required to hold the armature in the 'balance' position. Although this reduces its efficiency, this design can still produce more sound from less power than any other. Popularized in the 1920s as Baldwin Mica Diaphragm radio headphones, balanced armature transducers were refined during World War II for use in military 'sound-powered' telephones. Some of these achieved astonishing electro-acoustic conversion efficiencies in the range 20% to 40% for narrow bandwidth voice signals.
Today they are typically used only in canalphones and hearing aids due to their diminutive size and low impedance. They generally are limited at the extremes of the hearing spectrum (e.g. below 20 Hz and above 16 kHz) and require a seal more than other types of drivers to deliver their full potential. Higher end models may employ multiple armature drivers, dividing the frequency ranges between them using a passive crossover network. A few combine an armature driver with a small moving-coil driver for increased bass output.
The earliest loudspeakers for radios used balanced armature drivers for their cones.