Use the digital volume control in the DAM and compensate for the level. You can see the exact setting in the terminal if you are picky. But of you this as a long time test, which is resonable, levels will probably be changed anyway?
//
//
I thought by design/architecture the Soekris DAC is an oversampling DAC (x64)? Therefore impossible to NOS.
Isn’t the NOS filter fake? It should just be called “passthrough filter” to avoid confusion.
Or maybe I am totally wrong...
Isn’t the NOS filter fake? It should just be called “passthrough filter” to avoid confusion.
Or maybe I am totally wrong...
Not really sure how I can compensate the volume for certain sample rates...
Yes, as I said, it's going to be a long time test, but so big sound different makes it kinda...disturbing, as listening 88.2 and 96khz files requires noticeably big change in volume level and if I'm gonna forger to drop it down, moving to the songs with other sample rates - that's going to be a hard punch in my ears)
Yes, as I said, it's going to be a long time test, but so big sound different makes it kinda...disturbing, as listening 88.2 and 96khz files requires noticeably big change in volume level and if I'm gonna forger to drop it down, moving to the songs with other sample rates - that's going to be a hard punch in my ears)
NOS (44,48) in the pack looks like:
dam1021,44100,8,1007,8,6.4
07 NOS FIR1, 44.1 Khz.
dam1021,48000,8,7,8,6.4
07 NOS FIR1, 48 Khz.
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
dam1021,88200,4,1007,4,3.2
07 NOS FIR1, 88.2 Khz.
dam1021,96000,4,7,4,3.2
07 NOS FIR1, 96 Khz.
0.25
0.25
0.25
0.25
dam1021,176400,2,1007,2,1.6
07 NOS FIR1, 176.4 Khz.
dam1021,192000,2,7,2,1.6
07 NOS FIR1, 192 Khz.
0.5
0.5
dam1021,352800,1,4,1,0.999999995
07 NOS FIR1, 352.8 Khz.
1.0
dam1021,384000,1,4,1,0.999999995
07 NOS FIR1, 384 Khz.
1.0
dam1021,352800,8,1011,8,7.999999995
11 NOS FIR2, 352.8 Khz.
dam1021,384000,8,11,8,7.999999995
11 NOS FIR2, 384 Khz.
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
//
dam1021,44100,8,1007,8,6.4
07 NOS FIR1, 44.1 Khz.
dam1021,48000,8,7,8,6.4
07 NOS FIR1, 48 Khz.
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
dam1021,88200,4,1007,4,3.2
07 NOS FIR1, 88.2 Khz.
dam1021,96000,4,7,4,3.2
07 NOS FIR1, 96 Khz.
0.25
0.25
0.25
0.25
dam1021,176400,2,1007,2,1.6
07 NOS FIR1, 176.4 Khz.
dam1021,192000,2,7,2,1.6
07 NOS FIR1, 192 Khz.
0.5
0.5
dam1021,352800,1,4,1,0.999999995
07 NOS FIR1, 352.8 Khz.
1.0
dam1021,384000,1,4,1,0.999999995
07 NOS FIR1, 384 Khz.
1.0
dam1021,352800,8,1011,8,7.999999995
11 NOS FIR2, 352.8 Khz.
dam1021,384000,8,11,8,7.999999995
11 NOS FIR2, 384 Khz.
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
//
Last edited:
If only I understood - what does it mean...I'm the user here - not a developer, unfortunately(
p.s: 44 and 48khz NOS works with no issues (as well as the rest of the sample rates) - the problems with volume level affects only 88.2 and 96khz NOS.
p.p.s: thank you a lot for trying to help me!
p.s: 44 and 48khz NOS works with no issues (as well as the rest of the sample rates) - the problems with volume level affects only 88.2 and 96khz NOS.
p.p.s: thank you a lot for trying to help me!
Sample rate?
If you run with bank 7 you get NOS for all different Fs, If you run bank 4 you get actually a bit differences between 44/48 and other because I have implemented 3 dB interover margin in my filters - someone "complained" about that earlier.
Use an other pack 🙂
//
If you run with bank 7 you get NOS for all different Fs, If you run bank 4 you get actually a bit differences between 44/48 and other because I have implemented 3 dB interover margin in my filters - someone "complained" about that earlier.
Use an other pack 🙂
//
It's all my bad English...
I'm testing now NOS filter with bank 7 and the volume drops down a lot only with 88.2 and 96khz audio files - the rest sounds with no problem.
I'm testing now NOS filter with bank 7 and the volume drops down a lot only with 88.2 and 96khz audio files - the rest sounds with no problem.
I think I understand you - no problem.
But I don't think you will find a solution to this - I don't know how to fix it. All Fs seen to use the same coefficients.
Anyways, I updated the post above with the content if maybe someone else can see the reason.
//
But I don't think you will find a solution to this - I don't know how to fix it. All Fs seen to use the same coefficients.
Anyways, I updated the post above with the content if maybe someone else can see the reason.
//
This is my understanding also. Its not like the conversion process ges on at 44100 times a second - its still done at 2,8 Mhz.
//
I've read about this case some controversial opinions, so I'm not sure is the NOS filter makes 1421 true NOS dac or it's kinda simulates it? No matter of true, for me the most important thing about filter is - how the dac sounds with it. So, if I'll found the performance of NOS filter the best sounding to me, from all if the rest - I don't really care about - does it really make 1421 true NOS dac or not)
I use Audirvana for streaming to my Soekris 1321 and I've been playing around with its upsampling feature. The Soekris has the latest 1.21 filters, all of which I like. My question is how does the onboard Soekris filtering interact with the filtering that's happening with the upsampling? FWIW, I lean towards the soft butterworth on the Soekris, which I believe is the 'default' filter.
Any suggestions on settings for the upsampling filtering? Screenshot of options attached.
Any suggestions on settings for the upsampling filtering? Screenshot of options attached.
Attachments
If you feed it 384 kbps, the first set of filters are no more in play - only FIR2, the last OS stage is active - it is also a filter. If lower Fs, the filters are doing there thing as usual. If you upsample and also filter you get double filtering I suppose.
I suppose the Default is Bank 4 or Linear. I doubt that is Butterworth.
//
I suppose the Default is Bank 4 or Linear. I doubt that is Butterworth.
//
Ah, that’s good info - thanks! Concerning the default comment - you may very well be correct. I only assumed default as the soft butter worth is the selection when the led is completely off.
Soooo the newest Soekris 2541 has 4k tap filters. Possibly updated to 8k filters via future firmware update since there's enough horsepower.
I wonder if nowadays, stock filter = fine? No need for filter "brewing" ?
I wonder if nowadays, stock filter = fine? No need for filter "brewing" ?
There are a lot of aspects wrt. personal taste and the rest of the system behaviour. One need to test and evaluate...
//
//