JAMO C 803 IW Brochure - Pagina 7

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supply voltage which tends to zero when there is no input signal and reaches its

highest level when the ampliﬁ cation requires power. This supply voltage is continu-

ously variable but always lower than that of an AB class ampliﬁ er and thus a much

higher efﬁ ciency is achieved.

The outstanding energy efﬁ ciency (85%) achieved by this technology, allows very

high output power, without heating up the ampliﬁ er and thus elimination of the

need for excessively large heat sinks.

The power supply itself uses a high speed class D unit in order to constantly supply

the ampliﬁ er with the appropriate level of power.

Thanks to its voltage switching capability a BASH ampliﬁ er plays louder than a con-

ventional ampliﬁ er of comparable RMS power. Simply by virtue of the fact that it's

not a voltage limited ampliﬁ er it possesses tremendous dynamic power capability.

MFB (Motional Feed Back), servo control

We have given precise timing extremely high priority in the C 80 design. To enable

the relatively compact subwoofer to reach very low frequencies with perfect tim-

ing the C 80 SUB features MFB.

Even at high SPL the sound is precise and distortion very low.

Thanks to MFB the driver "overshoot" is dramatically reduced, dramatically enhanc-

ing timing. The ﬁ gure shown illustrates the overshoot of a woofer with and without

MFB.

MFB controls the woofer and eliminates the overshoot very quickly. Quite simply,

the woofer is able to start and stop correctly.

The MFB circuit works by constantly comparing the diaphragm movements with

the input signal.

The transducer at the back of the diaphragm monitors the movement of the dia-

phragm by measuring its acceleration. In the feedback circuitry the signal is con-

verted to a signal proportional to the speed. The speed is highest at the resonance