I haven't tried it, but you probably would need a LVDS receiver board as the 2nd I2S input is 3.3V CMOS/TTL level. Those boards exists.
Peter, add your name to the group buy list here GB For Salas SSLV1.3 Ultra-BIB
First post in the thread gives more info.
Noise during DSD playback
Is anybody use 1941 with direct "pure" output (no IC, no transformer, no tube)?
During DSD playback (even with SOtM 200 USB or laptop -HQPlayer- USB output) I have permanent -almost pretty loud- background noise, independently of the DSD rate.
The firmware and filters is in "factory" status.
PCM playback is noiseless.
Is anybody use 1941 with direct "pure" output (no IC, no transformer, no tube)?
During DSD playback (even with SOtM 200 USB or laptop -HQPlayer- USB output) I have permanent -almost pretty loud- background noise, independently of the DSD rate.
The firmware and filters is in "factory" status.
PCM playback is noiseless.
I reported same issue to soekris late Nov. last year, I'm using same direct output, too (whether with 1.21 or 1.23 firmware). But I receive no response about this from soekris till now...
I believe that some other users (DAM1021 or others, I'm not quit sure.), had reported same issue, too.
PS.Could you do me a small favor? Please enter your umanager, and try the command "filters", in combination with all filters with 44.1khz source? Check the umanager FIR2 report information. My FIR2 always get reported using 384k configuration while playing 44.1khz based sources...
Lawrence
I believe that some other users (DAM1021 or others, I'm not quit sure.), had reported same issue, too.
PS.Could you do me a small favor? Please enter your umanager, and try the command "filters", in combination with all filters with 44.1khz source? Check the umanager FIR2 report information. My FIR2 always get reported using 384k configuration while playing 44.1khz based sources...
Lawrence
I think FIR2 works on the same frequency irrespectively of which Fs is played. FIR1 moves different things to FIR2. FIR2 moves things to final output freq 3M.
No?
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No?
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I had same results with 1021. For me works best 3 diferent value caps. At the moment I have 36 pc of 470uf FG caps where before expermented with 3 diferent values 50+100+470uf with better results. Also tryed 24 pc of KA series they also work good.
Could you post pics please? I also like FG. Did you manage to avoid long connecting wires?
Please comment on the SQ differences you hear with the KA series vs the FG series in this application. Thanks
Its on dam 1021.
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KA series was the first Iv tryed and as being first try it gave my big ipresions it transofmed dac from stok quite a lot, I knw that caps make difference but newer thougt it will be that much. So I started expeement with caps, first I removed ceramics and it gave me same results as descibed in earlier posts. Then I tryed 12x1000uf FG series. As i had 3 boards at the time with diferent caps on them it vas easy to compare them. Only diference was that one of the boards had 05 resistors oather two where 012, so one 012 board had 24x470uf KA series and 05 board had 12x1000FG series, KA series bord sounded better more natural loats of space benind speakers but stil can hear presence of the speakers. FG series board sounded not as natural as KA but still had good imaging and good base bus on the high end was somethig missing. On third board I had all ceramics removed and had 12x50uf FG+12x100uf and 12x470uf and it sounded the best from all of them beter dunamic better lows imaging unbeleavible, speakers disapier compleatly the presence of the speakers dissapier so after some time of listening uo get impresion that you can take thous boxes out of the room because they do noting the sound comes from 3d image behind them and voices and instruments sounding so real that is scary its like they in the room. At the moment on 05 board I have 36x470uf FG and not sure it still has ceramics in and it need probably another 100 hr to burn in because usually I give good 300hr to burn in before any testing.
System for testing Jungson da88 09 version, sommers epilouge interconnects, DiY book shelfs from scanspeak relevator drivers.
System for testing Jungson da88 09 version, sommers epilouge interconnects, DiY book shelfs from scanspeak relevator drivers.
This is an amazing feat to get 36 caps on the board. Its like having the Hulk in a china shop. ;-)
Hi Soekris,
I am not sure if I have missed that. Is there a hole dimension diagram for drilling holes at the back panel of the case for DAM1941? I search through your site but there is only mech drawing of the board but not the back panel side. Thanks.
Ken
I am not sure if I have missed that. Is there a hole dimension diagram for drilling holes at the back panel of the case for DAM1941? I search through your site but there is only mech drawing of the board but not the back panel side. Thanks.
Ken
Thanks, I just did that the other day.
Sometimes though, going with custom board has its advantage. Over the weekend I decided to redesign my regulator board in a way that it fits directly in an empty space close to the output connectors. It also plugs directly into footprints of large caps that were there previously. I had to remove XLR and optical inputs, but I never used them anyway. It all fits like a charm. That's what I call proper integration 😉
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May I have your opinion, for anyone who saw following information reported on his terminal?
"# exit
L044
dam1941 uManager Rev 1.23 20190311 FPGA Rev 1.23 Press ? for help.
# filters
07 NOS FIR1, 44.1 Khz.
11 NOS FIR2, 384 Khz.
30 Deemphasis IIR, 352.8 Khz Samplerate, hiself f=5600 Hz, Q=0.485, gain=-10.1
#"
Thank you.
Lawrence
"# exit
L044
dam1941 uManager Rev 1.23 20190311 FPGA Rev 1.23 Press ? for help.
# filters
07 NOS FIR1, 44.1 Khz.
11 NOS FIR2, 384 Khz.
30 Deemphasis IIR, 352.8 Khz Samplerate, hiself f=5600 Hz, Q=0.485, gain=-10.1
#"
Thank you.
Lawrence
Do you guys believe the types of caps have more to do with the ultimate SQ than just the internal resistance of the caps of the power presented to the shift registers? I got significant results just by bypassing every shift register with a very low impedance (9 mohm) cap as close as you can get to each one. This was similar to the old 16 cap mods on the 1021 when we first did it, except with getting the caps as closest than I ever did before. Just avoid the long cap leads without effective bypassing, at a mere 4V do you expect them to handle a good deal of current without introducing transients of some sort? Try it. It was all HF hash I got on my 4 caps that were situated further away that clued me in.
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EDIT: The cap I used specifically is Wurth polymer,
875105144010 which is a 20mOhm part. 5 in parallel being low enough to the point of diminishing returns; 5mohm not counting the large cap at the end. The distance is however is very short, as close as you can get, barring mounting some copper busbars above each SR.
On my next mod i have idea to have copper bars along where ceramic where, close as posible so i can mount 6 diferent types it will be a lot of caps in paralel so esr wil be low too. Over 40 different caps will be in total, as caps change things on that board dramaticly I want to se now much is enough 🙂