Filter brewing for the Soekris R2R

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#1,882
analog_sa said:
Very interesting. I have always found your posts useful, yet we clearly listen to very different genres and perceive sound differently. I like the DAM because of timbral fidelity, impulse reproduction, microdynamics. The sore points for me are dynamics and image specificity. Both addressed in the 1941, but still lacking imho compared to top dacs.

Did not get the amp importance well. Did you mean the Modulus only became useful with metal once you installed the C128DP?
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Transparency above all else, I know the Soekris 4k Liner phase is very bright, if not too revealing, however I find it doesn't do the guitars justice, they sound fatiguing with that filter but come to life with c128dp with lots of detail that doesn't overpower everything else going on at the same time, namely percussion and bass shine through with a full broad sound stage. I've switched between the nc400 and Modulus several times now and can immediately tell that some micro details/dynamics are being lost with the nc400. It's more obvious the more complex the guitars are grinding as they often overpower the other instruments. Maybe my nc400 are old and need a recapping, I don't know, but if you can find someone to audition such an amp for a while I suggest you try, the Modulus does seem to pair in perfect harmony to each of the dam1021 raw outputs.

The main thing that is ever so obvious is low volume detail, everything is beautiful in metal music despite the low volumes, the lows and the highs, the dynamics, just come alive. I find myself killing the noise sources around my workspace just to see how low I can go with it despite hearing such detail. The nc400 didn't seem anywhere so great at low volumes. Of course the nc400 are still good amps with ridiculous amounts of power, I guess I can say I am spoiled after using them for years, not many class D even match it still.
 
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#1,883
analog_sa said:
Just tried the filter from #1633. Way too dull for my system. The impulse response looks very similar to the factory Linear filter.

I had forgotten that for higher resolutions the TNT filter defaults to the factory F4. This really reduces usability.
Click to expand...

Yes - it is really a compensation game 🙂

One thing to look out for - you don't want to start that game with a deficiency - or you you will never get where you want to be.

//
 
#1,885
hi,
I just realized that my DAC with Soekris dam1021 doesn't sound 192kHz files and DSD via AES and SPDIF inputs. USB is fine although.
Guys, should it be working fine? What can be the problem?

Please clarify what means 4k filters? Does it exist for dam1021?

Thanks.
 
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#1,887
TNT said:
Would anyone by chance have an idea about the delay difference between running a 2k and a 4k filter in a DAM?

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As far as I know, filter taps of a linear phase FIR filter are directly related to the delay. The more filter taps, the more delay.
As we went from 2k filter taps to 4k....

I do not know if something else of the firmware can have an influence on that.
Did you compare between different filters? Minimum Phase should have shorter delay.
 
#1,889
The Police Invisible Sun and other Police tracks really blew me away tonight, especially Invisible Sun, the synthesizers ambience I have never heard in such incredible full detail in my life, incredible soundstage and vibrance there, for something that was released the year I was born, sometimes I am in disbelief of how unbelievable how much detail there is in these older recordings. And I am merely using 44.1 flac rips. I think the main victim here is forever going to be my vinyl.
 
#1,890
atohmdiy said:
Well i will give you what i feel, maybe it's wrong. 😛

From my experience, when you listen to metal, their is 2 different path.

The first is 70's rock, and you go deeper and deeper in the extreme to lead you to metal, but even then your preference is always in these 70's sound. This is not for nothing that 70's music is comming back these day, most metal muscians start with 70's music, and the last few years there is some kind of rebirth... It makes me lagh when TNT talk of opeth, that move from death metal to progressive 70's rock. But others musician did that, for exemple steven wilson from porcupine tree and some other metal prog muciain. Personnaly i dislike their work and prefer what some doom musician did, because of their true understanding of what 70's music is.

Anyaway... the other way is to start with **** for teenarger like korn etc... And these people usually missed so much. When i saw some 70's band that stilled make live performance (wishbone ash, ten years after, john mayall, etc...) , i always liked to talk to some metal heads that finish the concert in their *** saying "i'm just just blown away, it was impossible for me to believe these old rock could sound so good".

The thing is, if you listen to some blues music or bluesy hard rock, you need that grainy sound. Stevie ray vaughan played with hot overwounded strat pickup to get this grainy sound,...and how many hard rock players plays with these old paf 50's les paul pickup etc. Vintage metal like doom is also the same with it's fat, grainy and saturated riff...

All that the c128dp seems to do better than the others, for the reason that was expressed before.

Modern metal is a little bit differant and lot colder (emg 81/85 often did their work here...). More effect like reverb etc... But even then the c128dp seems better because of the clarity in percussion (tempo if fastest especially in the drum) and increased dynamic do a perfect job.

Linear filters seems to me better in music that require clarity. Classical or even rock / metal with a lot of keyboard and effect that leads to ethereal sound.

I remember a metal song, i just don't ear the bass with the TNT filters, but with c128dp it's just sol good 😀

Anyway, spikestabber talk of switching from the nc400 to the modulus. I am very interested to ear more, i never eared the modulus especially with metal 😀
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Haha, My brother in law grew up as a 90s kid, he heard my system playing Fallout Boy, Sugar Were going down, and he literally told me he melted, he told me loved that group so much and never had he heard such detail in the track despite hearing it multiple thousands of times, period. Its the age old thing, you don't know until you hear it.

Blink 182, Aliens exist, adams song, etc, what once used to be much blending together in a puree of clipping slurpee, is a very open soundstage of complex instruments individually and clearly positioned with nothing absolutely drowning out each other, all with clear tight percussion and vocals shining through, even during the loudest brickwalled passages. Oh, and GUITARS THAT GRIND every strike of the strings, ooh so good.
 
#1,893
Hi,

I have been out of the filter changing game for over two years.
Last used oneoclock's filters. Was happy with them.
Upgraded to full_121. Not sure with filter is in use. Forgot to check.
Dynamics and "in the room" feel has improved.
Vocals are really good as well.

Would like to try the TNT filter in post #1833.
Do they include filters for high resolution to 24/192 and DSD?

Thanks for everyone's work on the filtering and firmware.

Vince
 
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#1,894
No DSD support

vdi_nenna said:
Hi,

I have been out of the filter changing game for over two years.
Last used oneoclock's filters. Was happy with them.
Upgraded to full_121. Not sure with filter is in use. Forgot to check.
Dynamics and "in the room" feel has improved.
Vocals are really good as well.

Would like to try the TNT filter in post #1833.
Do they include filters for high resolution to 24/192 and DSD?

Thanks for everyone's work on the filtering and firmware.

Vince
Click to expand...
No DSD support and no way to add mixing soekris filter as TNT source is not public.

192/24 is OK but best results are in the 44.1 88.2 176.4 ranges

Even if TNT filter is quite good, I reverted to std filter waiting for better support of DSD or public release of filter sources.
I want to listen DSD files out of Daphile without doing PCM convertion at player side and TNT release do not support !
Notice also that i'm using 1541 DAC and 1.21 filter are not that bad ! (Soeren did a good job !)
 
#1,895
In the filters where the Linear filter is named "TNT2", there is DSD support.

"--
-- FIR1 filters for DSD, 2.8M samplerate
--

dam1021, 2822400,1,4,991,31.2
04 Linear Phase DSD64 2.8 Msps, 30 Khz -3db

-0.0000000019950496586707214
-0.0000000017688802039638014
-0.0000000015578945664415124
...."

etc.

//
 
#1,896
You are right about DSD filter even for post 1833 : [DIYA_1021filt_noDCmode.skr]
Code: 
04 Linear Phase TNTmode, 44.1 Ksps,
04 Linear Phase TNTmode, 48 Ksps,
05 EQHQ_lpbr_b4, 44.1 Khz, 0-20.45Khz +-0.00000005dB, 22.50Khz -174dB
05 EQHQ_lpbr_b4, 48 Khz, 0-22.26Khz +-0.00000005dB, 24.49Khz -174dB
06 C128dp Linear Phase NYQUIST, Interpolation 16 SAMPLES, 44.1Khz.
06 C128dp Linear Phase NYQUIST, Interpolation 16 SAMPLES, 48 Khz.
07 NOS FIR1, 44.1 Khz.
07 NOS FIR1, 48 Khz.
04 Linear Phase Soekris, 88.2 Ksps, 38.7 Khz - 1 db, 39.8 Khz -130 db
04 Linear Phase Soekris, 96 Ksps, 42.1 Khz - 1 db, 42.2 Khz -130 db
05 EQHQ_lpbr_b4, 88.2 Khz, 0-40,9Khz +-0.00000005dB, 45Khz -174dB
05 EQHQ_lpbr_b4, 96.0 Khz, 0-44,5Khz +-0.00000005dB, 48.9Khz -174dB
06 C128dp Linear Phase NYQUIST FIR1, Interpolation 16 SAMPLES, 88.2Khz
06 C128dp Linear Phase NYQUIST FIR1, Interpolation 16 SAMPLES, 96Khz
07 NOS FIR1, 88.2 Khz.
07 NOS FIR1, 96 Khz.
04 Linear Phase Soekris, 176.4 Ksps, 77 Khz -1 db, 80 Khz -130 db
04 Linear Phase Soekris, 192 Ksps, 84 Khz -1 db, 87 Khz -130 db
05 EQHQ_lpbr_b4, 176.4 Khz, 0-163,6Khz +-0.00000005dB, 180Khz -174dB
05 EQHQ_lpbr_b4, 192.0 Khz, 0-178Khz +-0.00000005dB, 196Khz -174dB
06 C128dp Linear Phase NYQUIST FIR1, Interpolation 16 SAMPLES, 176.4Khz
06 C128dp Linear Phase NYQUIST FIR1, Interpolation 16 SAMPLES, 192Khz
07 NOS FIR1, 176.4 Khz.
07 NOS FIR1, 192 Khz.
04 Bypass FIR1, 352.8 Ksps
04 Bypass FIR1, 384 Ksps
07 NOS FIR1, 352.8 Khz.
07 NOS FIR1, 384 Khz.

04 Linear Phase DSD64 2.8 Msps, 30 Khz -3db
05 Mixed Phase DSD64 2.8 Msps, 30 Khz -3db
06 Minimum Phase DSD64 2.8 Msps, 30 Khz -3db
04 Linear Phase DSD128 5.6 Msps, 60 Khz -3db
05 Mixed Phase DSD128 5.6 Msps, 60 Khz -3db
06 Minimum Phase DSD128 5.6 Msps, 60 Khz -3db
04 Linear Phase DSD256 11.2 Msps, 70 Khz -3db
05 Mixed Phase DSD256 11.2 Msps, 70 Khz -3db
06 Minimum Phase DSD256 11.2 Msps, 70 Khz -3db

08 Linear Phase Soekris FIR2, 352.8 Ksps, 102 Khz -1 db, 177 Khz -130 db
08 Linear Phase Soekris FIR2, 384 Ksps, 111 Khz -1 db, 192 Khz -130 db
09 EQHQ_lpbr_b0, 352.8 Khz, 0-30.00Khz +-0.00000004dB, 264.60Khz -176dB
09 EQHQ_lpbr_b0, 384.0 Khz, 0-32.65Khz +-0.00000004dB, 268.40Khz -176dB
10 C128dp Linear Phase NYQUIST FIR2, Interpolation 16 SAMPLES
10 C128dp Linear Phase NYQUIST FIR2, Interpolation 16 SAMPLES
11 NOS FIR2, 352.8 Khz.
11 NOS FIR2, 384 Khz.
30 Deemphasis IIR, 352.8 Khz Samplerate, hiself f=5600 Hz, Q=0.485, gain=-10.1
30 Deemphasis IIR, 384 Khz Samplerate, hiself f=5600 Hz, Q=0.485, gain=-10.1 dB
I Appologize... 😱
 
#1,899
Why do higher res 24/192 files play at lower volume?
It's not softer. It's turned down way low.

Used the following to evaluate among other.
Both recorded well.

Check out Dead Can Dance - The Wind that shakes the barley.
Good female vocals and good reverb.

Also Chick Corea Trio Live - Homage.
 
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#1,900
Glad you liked it and the sound you report, was the one aimed for. I would not know why the higher rez playing is lower. I just took an existing brewing file and added the TNTmod.

I'm planning to release a whole set unique filters. I'll see to that all filters play equallt strong at 1kHz 🙂 Made 2 files playing 1kHz with the different Fs for measuring output - attached.

//
 

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