AFGROUP
srl
Fortissimo
Integrated amplifier
4 / 7
For sure what impresses much more as you see the
Fortissimo
inside is its board! We have worked a lot to
minimize every signal path. The board is a 4 layers one. The inner layers has permitted to increase the width of the
supply tracks and high current ground return improving the efficiency.
Note1: in similar applications the user has saved their LP vinyl on the PC/MAC to burn an audio CD. In such way the songs from the LP are usable
to be listen also in different environments such as on the audio car system or on the "second" audio system. Furthermore once the Vinyl information
has been saved on the PC/MAC the data can easily be passed on a portable player such as the iPOD. In other cases the users decided to save
their LPs and burn the CDs to listen to the LP songs without the risk to damage the vinyl support.
Note2: balanced input schemes designed for professional application are usually directed to maximize the signal immunity to common mode
disturbs to the detriment of other parameters such as the noise and the distortion. In fact in a professional application the balanced signals have to
work in environments where the common mode disturbs are very high. Unfortunately the same design philosophy is often pursuit also in the high
end applications! That approach, in the high end field, is conceptually wrong because in a domestic environment, where the high end equipment will
be working, the common mode disturbs and noise are less important than in a professional field. Therefore is not acceptable to maximize the
immunity to common mode disturbs to the detriment of general audio quality. Basing on such consideration we have designed a circuit that,
compared to the standard applications and those used in the professional field, was more respectful of the signal quality.
Note3: Thermal Track devices are bipolar power transistors having a inner diode that, for its position, works at the same temperature of the power
transistor itself. The anode and cathode of the diode are driven out of the package by two dedicated pins. Using the information, usually the
voltage across such pins, carried out by those pins very precise bias system can be implemented to avoid the power stage distortion to increase
due to temperature.
