Masterstroke "Class A" is the most advanced technology we can now imagine in the field of high-end amplifier for cars. Embodies the goals of STEG research in the combination of innovative technologies, operating effectively and in absolute balance of the whole. The "CLASS" employs circuit solutions as the absence of feedback
Negative and class A operation, technical attributable solely all'HomeHi-Fi. It introduces a surprising debugging tool, able to refine the sound of the amplifier favoring the dell'audiofilo sensitivity.
Built state of the art, the "CLASS" is expressed in the Bel Sound of car audio. Tonal consistency, sweetness and three-dimensionality of the sound stage, give an enchanting listening involvement, demonstrating the complete and unaltered reproduction of the original musical message.
· NO NEGATIVE FEEDBACK The amplification stages are extremely articulated electronic circuits, the interaction between the components coupled with the physical / technological limits of the same and signal complexity are among the many variables that combine to produce unwanted effects on system operation. The design of an amplifier, already in itself difficult, is complicated when dealing with the type of audio signals: the musical information in the input must stay unaltered throughout the process, to complete recur every microinformation on the amplified output; in this case, one can speak of "High Fidelity". Realize this type of circuitry requires experience and deep knowledge of technology, components and sound. Know-how to draw on in creating a balance between the many factors at play. There is a method commonly used that simplifies the design of an amplifier is the use of Negative Feedback in order to fill the imperfections generated by the circuit during the amplification process.
Power 4 ohms stereoWatt RMS - 11 to 14.4 Volt 100 x 2
Power 2 ohms stereoWatt RMS - 11 to 14.4 Volt 200 x 2
Power in Watts RMS CLASS A - 11 to 14.4 Volt 50 x 2
Volts RMS 0.4 V - 5.5 V
466 x 60 x 255 mm
The feedback has a desensitizing type function, limits the inaccuracies due to a flawed design and avoids the defects of the circuit affect the overall electrical efficiency and specifications. Acts by successive approximations, comparing the amplified signal (suffering from distortion) with the original signal, the change mitigating the defects accumulated along the amplification path; the effect is extremely good in the common design but the modeling action, acts on the originality information music producing side effects on the timbre, the purity and transparency of sound. The goal of the project CLASS was to create an amplifier without compromise, avoid using gimmicks can correct design errors fell within the essential requirements. The circuit of the Class A has, among its main features, the complete absence of feedback Negative between input and output, the design effort required because this condition is realized was amply repaid by the results. Without compensations (present in the majority of amplifiers), the output final stage is extremely stable on all types of load. The absence of feedback and the optimal dimensioning of all stages ensure that, in the vicinity of the clipping, the saturated circuit operand a distortion by the "soft waveform", thus avoiding the introduction of the odd harmonics and, as in tube amps, listening does not tire even at high dynamic regimes. In amplifiers that adopt the feedback Negative clipping is considerably more pronounced ( "hard"), which could affect the tone with the introduction of odd harmonics that increase the unwanted spectral content.
· THE CLASS A The operation of an amplifier is defined in class A when active devices that constitute lead for the entire duration of the input signal period, or the current flowing in them for the whole of the oscillation signal, without ever vanish. Such behavior reflects positively on the electrical characteristics and timbre as the active components that have the task of amplifying (bipolar transistors or MOSFETs) operate in the linear region of its characteristic curve; hence they can best express their potential. In order that a conventional output stage in class actually functions "A" it is necessary that in the output devices flowing a current such that, for a given nominal power supplied to a certain load, is avoided in all conditions switching off of the same devices. The class A therefore, ensures the best possible linearity but with a very low yield because of the considerable power dissipated. The yields of conventional amplifiers in class A are unlikely to exceed 10 to 15%, from what we understand why the class A is reserved for domestic use only. The realization of amplifiers from a few tens of watts binds to dissipate substantial amounts of heat, so the use of bulky fins, incompatible with the limited space, typical of the car audio applications.
· H.E.A.R.T. - High Efficiency Class A-Regulation Technology: With the aim to extend the advantages of the class A to car applications, we have developed the circuit system H.E.A.R.T., able to minimize the waste of energy typical of the amplifiers in this operating class. H.E.A.R.T. in broad terms, limits the power to be dissipated to that strictly necessary because the amplifier operates in class A, continuously adapts the electrical behavior of the amplifier stage to the conditions of the signal and of the output load, dramatically increasing the overall efficiency of the system if compared with traditional class A amplifier. This complex strategy acts without compromising in any way the timbre and electrical advantages associated with this level of performance and ensures the playback "A" up to 50 watts RMS per channel.
· ADJUSTING THE WORKING CLASS AND DYNAMIC RESERVE The CLASS is the first amplifier capable of making the listener to interact with the sound type played by the audio system, subjectivity dell'audiofilo fact, has been so far an unmanageable variable phase of the project. Despite being born with undoubted Audiophile inclinations, the CLASS has considerable headroom to satisfy the listener who appreciates playing "energetic". Thanks to H.E.A.R.T., operates up to 50 Watts RMS Class A pure, it exceeded that value, is capable of providing power to more than 100 Watts RMS per channel, passing into the AB class operation. The top of the heat sink integrates a control that acts on the polarization of the circuit; varying the position, it sets the threshold that determines the passage from the operating class A to AB. The adjustment range can vary from 1 to 50 watts, with the halfway knob for example, the amplifier operates in class A up to 25 watts and about 25 to 100 Watt class AB. Thanks to this adjustment it is possible to perform a sort of "tuning" of the system which, with the intervention on gradients and on the details, adapts to the listener's perception.
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