I believe they are meant to mitigate issues with the DAC chip used. In my experience with the original D40 (not the PRO), I found the audio to be a bit "ringy" (too much volume on the ultra high frequencies). I also feel that the mid-range volume sometimes dips too much.
In the D40, what you get from changing the filters can depend on what Sound Color you are using. But neither works like a good, old-fashioned equalizer (despite that the filter option on the Loxjie remote is labeled "Eq"). They would be better off adding genuine Eq or using a different chip.
I am considering replacing the D40 with the SMSL DO400, rather than the D40 PRO, as the consensus of opion from the reviews I have read thusfar suggest it's a better alternative. Both have NOS (non-oversampling modes) which I have heard is better for hearing dialog in movies and TV series.
But I resent having spent over $400 for the original D40 and having to contend with the ringing, parts of the midrange suddenly getting too soft, the lack of tech support, and the poor technology for upgrading the firmware. I am coming to regard Loxjie as SMSL's bargain basement line, which really isn't that much of a bargain. I replaced my D30 after a year with the D40 and now I'm looking to replace the D40. High-fi audio should last longer than this. Until about 3 years ago, I was still using an integrated amp, a cassette recorder, and a CD player that I bought in the 1990s, speakers that I bought in the 1980s and a turntable that I bought in the 1970s.
In the D40, what you get from changing the filters can depend on what Sound Color you are using. But neither works like a good, old-fashioned equalizer (despite that the filter option on the Loxjie remote is labeled "Eq"). They would be better off adding genuine Eq or using a different chip.
I am considering replacing the D40 with the SMSL DO400, rather than the D40 PRO, as the consensus of opion from the reviews I have read thusfar suggest it's a better alternative. Both have NOS (non-oversampling modes) which I have heard is better for hearing dialog in movies and TV series.
But I resent having spent over $400 for the original D40 and having to contend with the ringing, parts of the midrange suddenly getting too soft, the lack of tech support, and the poor technology for upgrading the firmware. I am coming to regard Loxjie as SMSL's bargain basement line, which really isn't that much of a bargain. I replaced my D30 after a year with the D40 and now I'm looking to replace the D40. High-fi audio should last longer than this. Until about 3 years ago, I was still using an integrated amp, a cassette recorder, and a CD player that I bought in the 1990s, speakers that I bought in the 1980s and a turntable that I bought in the 1970s.
