Lowpass filters
There are 7 different filters (internal configuration of the ES9038PRO) built in the M17 for
your preference.
Filters are the sound effects born with the chip, which only has slight adjustments for the
sound. Here are some introductions to different filters. These are only for reference since
actual listening also has something to do with the matched device.
1) fast roll-off, linear phase filter: Most Common filter with clean suppression and high
rejection, best for music with high transients. Provides crisp clean highs
2) slow roll-off, linear phase filter: coherent and clear sounds, positioned near the middle. It
is suitable for classical music.
3) fast roll-off, minimum phase filter: minimal Pre- Ringing, preferred for Imaging and
soundstage. No aliasing in frequency domain. Stronger bass than Linear Phase, clean highs
4) slow roll-off, minimum phase filter: non-symetrical filter designed to minimize pre-ringing.
Strong punchy bass with good transient attacks
5) apodizing fast roll-off, linear phase filter: Version of Linear phase fast roll-off filter
optimized to improve pre-ringing.
6) hybrid fast roll-off, minimum phase filter: Combination of Linear-phase and
Minimum-phase. Fast transient attack, strong punchy bass, crisp highs.
7) brickwall filter: one of the earliest designs, intended for highest suppression possible, with
high delay and pre-ringing.
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