Yea, kind of quiet on this subject. I have owned the 150B for several months and it seems to function well enough as a preamp streamer but some Qobuz and ripped music is a bit bright so going backwards to a tube preamp and DAC kind of defeats the 150's intent. Understand many of us are older, 2ch people, so this almost audiophile streaming is new to a large number of 150 users.
You access the filters with the In-Out-Setting menu from the Rose Home Screen or app. There is a lot that I do not understand other than the preamp settings which need to be off if you're using the Rose as a preamp.
But the filters, it is difficult in my current room to hear a difference, well it is kind of a pain to switch to A B test... I ended up on the Brick Wall but for sure it would be nice to have someone in a qualified room with Tube and SS testing to report findings... like tell me your answer.
I find the 150 amazing but not vinyl sound at any resolution from my Tube mono blocks that sound amazing with vinyl. Maybe it is the DAC, or filter chosen but my older Wadia DAC was easier on the ears... Hope someone at Rose can address this as well as all settings from that screen.
The filters are there to adjust how the digital is converted to analog so that digital artefacts are minimised.
If you consider CD quality at 44kHz, this is 2 channel stereo so each channel is 22kHz of digital sampling. If you still have good hearing then you can hear frequencies up to 20kHz, so you see the CD digital only really has 1 sample for every 20kHz "note" resulting is artifacts when this is decode - these are harmonics that occur as it cannot exactly encode this signal as a pure note with a digital signal step function. You also need to hide (cutoff) the 22kHz artifical signal as this is the sample frequency - so a very strong signal. This is why some digital CD players or streamers can sound harsh or metalic and tiring to listen to.
The result of this is ringing - or just distortion with harmonic artifacts.
You can do 2 things to mitigate this
1) Up sample the signal to higher frequency so your digital edge (the sample frequency) is a long way from what you can here so you can use a soft filter
2) Apply filters that try and hide the distortion
3) do both.
I recommend option 5 after you set the up sampling to 176 kHz. This will give you the a nicer tone.
I strongly recommend you don't use (1) as it will create the worst effects.
(Please note, this is a different problem from mp3 compression which creates artifacts (distortion) because of the loss of information if you compress things too much. The ultimate worst case is DAB radio which is terrible because of the compression).
I have read the owners manual and searched this forum for the difference in the various filters but found no answers.
1. BRICK WALL FILTER
2. Hybrid fast roll off filter
3. Apodizing fast roll off filter
4.Minimum phase fast roll off filter
5. Linear phase slow roll off filter
6. Linear phase fast roll off filter
HOW do each of these filters affect the music and when should i be using them? I HAVE THE RS-150B