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The Lyngdorf true digital amplifiers are based on non-feedback construction, which means there are no differences in the THD performance at any frequency when it comes to the output stage. In other words, the distortion is very low and linear.
However, another major influential factor to the THD performance of a fully digital amplifier is the quality of the power supply. With the Lyngdorf power suppliers we have obtained completely identical and very low impedance which gives a completely flat THD at all frequencies. This is simply a necessity for a high performance implementation of a true digital amplifier.
The power supply uses a toroidal transformer and the advantage of this over a conventional C or El core transformer is significantly less magnetic radiation, something which can potentially induce noise (50/60Hz) which would be very audible.
The supplies for the output stage and the microprocessors are kept completely separate since they use separate windings on the transformer.
However, the truly unique aspect of the power supplies in the Lyngdorf true digital amplifiers is that it actually works as the volume control of the product. When you are playing at low volume levels, the voltage supplied to the output stage is low - when you turn up the volume control you increase the voltage, and thereby the output, from the amplifier.
This is implemented as a DC -> DC converter. On the "primary" side full voltage is constantly applied and then the DC -> DC converter switches the voltage needed for a given setting of the volume control to the "secondary" side (= the voltage supplied to the output stage).
In order to be able to turn down the volume fast again, the DC-> DC converter can, quite uniquely, switch the power back to the "primary" side.
The result of this truly unique way of controlling the volume level is that a Lyngdorf true digital amplifier gives full dynamic range from maximum volume and down to the 62dB reading in the volume control (which corresponds to as little as 1V RMS on the speaker terminals). This is due to the fact that when the supply voltage to the output stage is reduced, then you lower both the output signal AND the noise floor - and thus the full dynamic range is maintained - also at low volume levels. Perhaps this is one of the reasons why reviewers often mention that Lyngdorf amplifiers play equally well whether you're playing at high or low volume levels.
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