Primare SPA22 User Manual download pdf (Page 2)

Primare’s UFPD (Ultra Fast Power Device) provides for the possibilities of an ‘audiophile’ Class D design. It is a

Class D technology which has a consistent 26dB feedback loop gain across the entire audio range and is stable

way beyond the audio band. This is quite easy to achieve in conventional linear ‘continuous signal’ amplifiers, but

much more difficult in ‘non-continuous’ high speed switching amplifiers.

Rather than have the amplifier and then the filter as discrete stages, the UFPD design integrates the two, making

control with feedback much more immediate and accurate. The UFPD amplifier actively adapts the loop gain to

keep the total loop stable during start up, clipping and current limit. It senses the changes to the filter output and

compensates by applying the precise amount of feedback. This adaptive pole control allows for several more dBs

of constant loop gain across the audio band and maintains performance irrespective of load (impedance)

variations.

Primare’s UFPD treats all signals equally regardless of frequency or slew rate and has the ability to suppress the

filter resonance entirely. Consequently THD is kept very low at all frequencies. With a very wide ‘load

independent’ frequency response UFPD is able to drive any speaker while maintaining control and accuracy.

Primare has optimised the performance of its innovative UFPD design with the precise selection of circuit

component values and quality, verifying the design with extensive measurement and listening.

Summary

UFPD displays:

• Wide bandwidth

• Flat frequency response

• Load independant frequency response

• Low output impedance in the entire audio band

• Low THD in the entire audio band

• Low noise

more…

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Primare SPA22 User Manual Page 2