WANDLA DDF – Digital filters
DIGITAL FILTERS
explained
ESS digital FIR filters
WANDLA makes use of the ESS Sabre 9038PRO DAC chip. Via WANDLA’s menu, the user can choose from three ESS filters in addition to our HQ filters. We encourage you to experiment to find out which is your personal favorite.
Linear Phase Fast Roll-off (ESS Lin-Ph)
Minimum Phase Fast Roll-off (ESS Min-Ph)
A minimum phase filter with steep slope after passband (fast roll-off). As Lin-Ph it has very good aliasing rejection, however it is better suited for transient reproduction, because there is no pre-ringing.
Apodizing (ESS Apod.)
An apodized linear phase fast roll-off filter. It has significantly lower pre-ringing than Lin-Ph and lower post-ringing than Min-Ph, however a compromise is made in aliasing rejection. ESS Apod. filter performance is somewhere between Lin-Ph and Min-Ph, because it can preserve good transient response and constant delay for all frequencies in the audio band.
HQ digital filters
Specialist filter-builder Jussi Laako from Signalyst has adapted digital filters from the HQPlayer app to be implemented in our SERCE module, that lies inside of WANDLA. The appropriate digital filter settings can be made via the menu where the user can make his choice from the two HQ digital filters which are included at launch. We encourage you to experiment with these HQ digital filters to find out which is your personal favorite.
Gauss filter (HQ Gauss)
Apodizing filter with focus on optimal time-frequency response. Provides very good transient response and space information. Good general purpose filter fit for most source content and genres.
Apodizing filter (HQ Apod.)
Apodizing filter especially for modern recordings. For recordings made in real acoustics or otherwise having notable space information.