Spec RSA-F33EX Integrated Amplifier
An amplifier for the music. It’s a Reference Model of SPEC.
Because an amplifier which has high gain is sensitive to rigidity and vibration, wooden structure provides suitable vibrational damping property.Like a musical instrument maker , we select materials and consider grounding method.As a result,the bottom plate is made of spruce, and the insulator is made of maple with hickory embedded in the center. They are the same as the material used for a violin.They vibrate with music and bring out the beautiful sound.This is why we say “the amplifier is a musical instrument”.
It’s an “ANALOG” amplifier
The myth that a “CLASS D” is a DIGITAL AMPLIFIER is incorrect. SPEC CORP. has adopted “Pulse Width Modulation” in our “CLASS D”. This “PWM” converts “signal amplitude” to “duration switching” through “ANALOG PROCESSING”. This system doesn’t digitize the audio signal. This is in fact type of analog amplifier because magnitude resolution is infinite. “CLASS D” with PWM contributes to bring you beautiful acoustical sound. In the past, some audio makers adopted delta sigma modulation for “CLASS D” . This is quite simply “1bit digital” modulation. Combination of switching technology and analog technology makes the sound realistic and beautiful.
