High definition digital audio at 96 kHzRumor has it that digital filters sound hard and metallic, that there is no warmth and clarity and the dynamic and stereo imaging is flat. Many sound engineers consider that "high quality analog filters simply sound better". The difference between analog and traditional digital filters is, in the final analysis, related to the frequency range of the filters. The frequency range is clearly wider in the case of analog filters than the traditional digital filter which is sharply limited to half of the sampling rate of 40 or 50 kHz, ie. around 22kHz. As a result, non-linearities in amplitude and phase characteristics occur well before the cut-off frequency which lead to coloration at high audio frequencies.

In order to implement a digital filter whose sound qualities are comparable with a good analog filter, the corresponding transmission characteristics must be designed in digital form. High quality digital filters should sound as good at high frequencies as good analog filters and in order to achieve this a higher sampling frequency is required. The distortion of the frequency axis is reduced the higher the sampling rate becomes relative to the audio range.

The Jünger Audio digital filter processor Model e07 works internally at twice the sampling rate of the input signal and can therefore provide filtering up to around 40kHz moving any distortion of the signal away from the audio spectrum. This results in a much cleaner audio signal. Listening tests show remarkable results with a more realistic and "authoritative" sound. Stereo imaging is preserved and reverberation decays naturally without any "metallic" components. This situation can be proven technically by measuring the results which clearly show an improvement at higher frequencies together with improved phase characteristics.