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Filters
Last updated: May 5, 2022 12:07. Revision #3943
The DacMagic 200M has three different digital filter functions: Fast, Slow and Short Delay. All three filters are highly sophisticated audiophile topologies,
optimised specifically for audio playback. In our opinion, these filters offer excellent sound quality but differ subtly in optimisation, hence we’ve made all
three available to you.
Note: For clarity, all diagrams show the theoretical response of the digital filter itself, excluding any analogue filtering at the DAC output or the
antialiasing
filter applied during recording and/or mastering of the digital source.
Fast Filter
The Fast (Linear Phase) filter is a highly regarded audio filter offering low ripple in both the pass and stop bands, and what is known as constant group
delay. Constant group delay means that audio signals of all frequencies are always delayed by the same amount when passing through the filter. All
audio is therefore fully time-coherent at the output.
The trade-off with this type of filter is that its impulse response will exhibit some pre-ringing. In other words, when excited with a theoretical impulse, the
output has both a small amount of pre- and post-spike amplitude ringing (albeit well damped).
