So far no-one has mentioned PHY or Fertin, both from France. These drivers are arguably the cream of the crop in high efficiency 'full range' drivers. The PHY is featured in the Ocellia loudspeaker, one of the few that can really get down to 40Hz (but not cheap by any means). Tonian Labs imports PHY and uses them in their speakers as well.
Both drivers feature Alnico magnet structures, exotic diaphragm materials and substantial basket construction. Various means of high frequency extension are also available including a peizo tweeter that uses no crossover
Being available in 16 ohms (or more in the case of the Fertin) they can be easily driven by any amplifier technology, although the discerning listener will notice that amplifiers with a high output impedance will sound better on them (Better: smoother, more definition and more impact in the bass region).
Both drivers feature Alnico magnet structures, exotic diaphragm materials and substantial basket construction. Various means of high frequency extension are also available including a peizo tweeter that uses no crossover
Being available in 16 ohms (or more in the case of the Fertin) they can be easily driven by any amplifier technology, although the discerning listener will notice that amplifiers with a high output impedance will sound better on them (Better: smoother, more definition and more impact in the bass region).