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The first performance feature required of audio equipment is the capacity to convert air vibrations into sound waves so that the slightest signal can be appropriately heard by the ear. This means that an essential condition of the vibrating medium, i.e. the diaphragm, in the speaker which constitutes the system of conversion from electrical signal to air vibration is that it needs to be as light as possible. Divided vibration, which is unavoidable in the case of point drive, is possible, as is also ultra-miniaturization if total drive is possible. Moreover, if headphones are used, there will be reduction in the mass of air that needs to be driven, creating a more ideal situation.
The electrostatic (condenser) type is the system that comes closest to this ideal. STAX refers to speakers of this type as “earspeakers” and has continuously sought for the ideal form. Since a dedicated unit is needed for drive purposes, the development of such units is equivalent to the pursuit of high sound quality in the electrical signal system. The matching drive system and the amplifier system are used for driving electrostatic speakers, and in the case of amplifiers it is possible to build circuits by means of vacuum tubes. In the case of electrical signal systems too, it is generally known that sound quality varies extensively depending on the circuit configuration, parts, etc. Which should be selected? There is also the element of musicality that needs to be taken into consideration when determining the sound that is the be-all and end-all of audio.
The new SRM-727II employs semiconductor output drive stage and non-feedback (NON-NFB) output stage for the first time ever in a STAX driver unit. A pure balance DC amplifier configuration is used for the large current emitter follower Class A output stage. A significant increase in dynamic range especially in the upper frequency has been achieved. A high level of sound purity is achieved through the simple two-stage amplification circuit with low-noise FET input stage. This is a brand new driver unit that opens up new vistas for the sense of mass and textural expression supported by a virtually unparalleled degree of resolution, a natural sense of openness, and a powerful power section.
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