On my M5 all files are lossless format. Flac and dsf file.
You say, if i use lossless files lowpass filter mode si not active ?
Tbh, this is above my pay grade, getting into audio engineering and human ear science. Basically, my understanding is the filters work best by helping tame or correct certain types of odd frequencies aberrations and some audio compression artifacts that may tie into them, but they other uses too. You'd have to take a closer look at which of these filters made it into the M5 but most people just stick with one that best suits their listening habits. I chose #4, which is slow roll off, minimum phase. The numbers won't mean anything to M5 users, just look at the filter type and its effects.
From the m9XX's user manual:
F1 = sharp roll off, linear phase
For linear phase response and time coherency. Fast roll off protects against aliasing distortion from high amplitude high frequency content. Best for recordings that are loud, compressed, and with lots of treble. Will contain substantial ringing before and after transients(pre-echo and post- echo). Note that the ringing occurs at the Nyquist frequency (1⁄2 of the sample rate), so it is not directly audible. However, it can cause intermodulation distortion in downstream components.
F2 = slow roll off, linear phase
For linear phase response and time coherency. Best for acoustic music without compression and artificially high levels of treble. Will have very low levels of ringing before and after transients but is susceptible to distortion artifacts caused by high amplitude high frequency information in the program material.
F3 = sharp roll off, minimum phase
Not linear phase in the pass band. Fast roll off protects against aliasing distortion from high amplitude high frequency content. Best for recordings that are loud, compressed, and with lots of treble. Will contain substantial ringing caused by transients, but all of the ringing is shifted to after the transient. This can reduce the perceived effects of downstream intermodulation distortion due to the Hass Effect.
F4 = slow roll off, minimum phase
Not linear phase in the pass band. Best for acoustic music without compression and artificially high levels of treble. Will have very low level of ringing caused by transients and ringing will be shifted to after the transient.
