Thanks Soren, I was just about to ask you about the PWRLED output resistor
. I am also working on a front panel switch board to be hooked up to J5 connector and will probably put these things over there.Soren, please notify if is it possible to implement synchronous clocking mode to dam1021 with externam MCLK input (maybe using FPGA_MCLK_OUT pin reconfigured in FPGA as input), leaving onboard Silabs clock and reclocking functionality unused.
If so normundss can implemet optional MCLK trace between Amanero and dam1021 on his board?
If so normundss can implemet optional MCLK trace between Amanero and dam1021 on his board?
The pin marked "FPGA SLV" might be used for master clock in, but can't really say much for functionality not implemented yet....
May be can consider adding a power input header for 3.3v pin of Amanero? It can be used to supply external power to Amanero and isolator when USB power is not being used.
I had the 'hole effect' at first too. Switched the polarity on my speaker terminals and it came into focus. I am positive my wiring is correct. Using SE direct outputs to integrated amp. Now that the polarity is correct I am floored by the sound of this thing. I am going to listen more. I have none of the harshness in upper mid or digital artifacts of any kind. I would never guess this is a digital setup except that it is retrieving so much detail. All my CDs are now a new experience.Yes I could, but there is nothing hard in the wirering : on the non bufered SE the gnd are the two center vias and the two external are the one who go to the hot pin of the RCAs. For the bufered SE I used the shematic correction of Hifiduino ! And mainly I drink any wine today !
Could it be something else ? I checked the external speaker wires (hope I have not one of my internal passive filter out of phase ?)... but mainly it deseappers when i swap the DAC ! It coud be also psycho : not the habits to have huge width !
Bad PS traffo ? Problem on the DAC itself (I find the assembly quality very high ! )
If you really want i take a photograph of the output I can but the result is quite similar on the two output : buffered and not buffered ! So ultimatly it could be an non detected problem of phase onto the speakers : 3 ways... LR4 tweeter filter out of phase with the LR2 medium on the both speaker or just in one ?
Hummmm when two people says I'm wrong I'm certainly wrong here, I saw no reason why my speaker would gave a different result than yours guys !
@ Nige, yes they are good enough... and better enougfh if they are alkaline cells as the impedance is very low with this technology which doesn't need for test a shunt reg to lower the output impedance (my simple understanding of the TNT site reviews about regulators and output impedance measurement).
It's a good sign than your test give better result, it says than there is a reserv of possible improvement between the external layout and the digital filter... good and positiv sign.
@ Paul : I like a lot what you wrote about an output traffo : could add it some harmonics in the highs ?
It seems urgent to wait first an (or some) improved digital before any other harder tweaks (output buffer, PS, etc !).
Hi Robert,
That sounds promising
This weekend I'll try the DAC in my system
Strange that your setup was first out of phase, you're not the first one to report that.
Here are some links to check in/out of phase:
LRMonoPhase4.wav
out-of-phase.mp3
More tests: audiocheck
Regards,
Danny
That sounds promising
This weekend I'll try the DAC in my system
Strange that your setup was first out of phase, you're not the first one to report that.
Here are some links to check in/out of phase:
LRMonoPhase4.wav
out-of-phase.mp3
More tests: audiocheck
Regards,
Danny
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An output might help, but possibly not the high end. This is the most concise description I can find of the effects of an output transformer:
Audient, HMX - The Benefits of Harmonic Distortion!
I've tested a replacement digital filter - which think I messed up and it's not filtering at all.
An externally hosted image should be here but it was not working when we last tested it.
I won't get a chance to correct and retest my filter trials until I get back from work this afternoon (still on my breakfast coffee) but I suspect that the harshness is largely due to the stock 44.1 filters. The DAC is certainly much smoother with 44.1 upsampled to 176.4khz than 44.1kHz so it seems likely that altering the 44.1kHz filters will bring clear improvements. Initial tests did seem promising in this regard.
cheers
Paul
I checked phase (with stereophile test cd) on my setup which uses the onboard XLR jacks and it was correct and does not change when swapping DAC's. I haven't used any of the SE outputs so couldn't say if they were correct.
I'd been working on a similar but different board and found that the Vampire Wire right angle PCB mount jacks use a standard BNC r/a footprint. I'm sure there are other RCA jacks that use the same footprint.
Do you mean you had to change the polarity of connection to just one of your speakers?
When you start GB?
You mean with amanero ? At 60 batches Amanero is 39 euros ! And at 120 batches ?
@ Nurmundss : R1 resistor could be putted between the traffo vias to avoid soldering on the copper signal leads? No problem with the "big" PE traffo linked in first page (the best of the three for noise aj jitter becomes here a lesser important data in relation to the Nevawa - and is few expensive as well thhan this last). It can stacked above the resistor .
I'm not a specialist about RF pcbs, but maybe a bigger distance in width between the three I2S signals leads could permitt less intearction between the return path signals even if it's a continuous plane : the gnd width plane between signals leads seems not larger than the signal leads themselves, maybe a little too short ! Certainly a detail with those short distances and a two cents of me ! You certainly may trace them longer to be less close to each others, but don't know as well with its high 384 speeds and PCM/DSD ones if the leads have to be the same length also... RF specialists here will coment
What is the interest of a front panel instead a simple led please ? I didn't not understand that point.
As well, in a same spirit as a GB for the Amanero with less carbon traces and global warming if it matters : OEM board - I2S over USB Audio : 39 euros without GB : short traces, many gnd vias, 3.2 V output as well ! Can output 16 -24 & 32 (Amanero is always 32 bits or outputs what it seesat its entry ?).
Maybe you can ask a free example to Joro if it's just stacked without soldering and re send it to him if no GB are made after ? If a cotation is asked to him via an interrest GB list : your pcbs aand the OEM boards can be send in one parcell to each member ! Idem : less transport, less money better global warming - win/win !
@ Paul & POS : thanks for your work
: if I can help for SQ benchmarks, a Wave I/O is arriving this week : I can check the filters and report as well if you want a second point of view!
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Right. After checking phase (thanks Danny_66) I flipped them back in phase and and moved my speakers around for a bit. Problem solved. I suppose the new DAC improved response, imaging and separation enough that I had just accordingly.
Sounds great. I am using spdif from CD transport and managing volume from passive pre on my amp. It sounds like most people here are using computer or streamers for source. I wonder why there are so many reports of glare, etc so far? Most people are blaming the filters for the answer but what are other possibilities?
Sorry but to mix BNC and RCA is the worst of both worlds. Best would be to have the source fitted with a 75 Ohm BNC connector. Easy job in most cases.BNC at both sides is most optimal. If that's not possible (heard the strangest reasons here like "resale value"
) it is better to keep RCA connectors at both sides. BNC is better though certainly if one wants the best results there is no other choice.
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I'd stick with filters as the primary cause. Until there are some better sorted filters in circulation I'd be cautious about putting too much effort/money into solving problems that may well not exist.
If you are are setup with a usb -> serial interface there are a few alternate 44.1 filters in the main thread. They are a bit of a learning exercise - but I'm listening to the minimum phase filter I made and it's results in a very different sounding DAC to with the stock filters. I won't says it great but it is different and more mellow, with the "in yer face" detail toned right down.
cheers
Paul
Filter Solutions
Hi Soren,
Last year I started working with Professor Patrick Gaydecki (Patrick Gaydecki | The University of Manchester | School of Electrical and Electronic Engineering ) of Manchester University, we are working together in a commercial joint venture to develop a new breed of DSP controlled loudspeakers….Building on the Signal Wizard 3 technology, Signal Wizard Systems Home we are developing some rather special boards…..We may well have a very neat solution to all your filter ( and connectivity) issues!
Please email me if you would like to explore some ideas, derek@custominstallaudio.com
I will copy this on the other thread.
All the best
Derek.
Hi Soren,
Last year I started working with Professor Patrick Gaydecki (Patrick Gaydecki | The University of Manchester | School of Electrical and Electronic Engineering ) of Manchester University, we are working together in a commercial joint venture to develop a new breed of DSP controlled loudspeakers….Building on the Signal Wizard 3 technology, Signal Wizard Systems Home we are developing some rather special boards…..We may well have a very neat solution to all your filter ( and connectivity) issues!
Please email me if you would like to explore some ideas, derek@custominstallaudio.com
I will copy this on the other thread.
All the best
Derek.
I had (not tried your filter yet) a dull dynamic and I am enable to say if it comes from PS or filter or the (subjective perception) out of phase. I often found the Nichicon caps made for low impedance and computer boards to be a little dull in Bass and mid bass, especially some caps like the Nichicon HZ computer board serie. Don't have experience with those CL caps for what it is Worth ! Not sure they beats some more classic caps like the Nichicon FR serie or some polymer of other brands (UCC and Panasonic... the best according my extensive subjective tests. Btw a better inductance is not giving a better subjective transcient between two different caps, nore a better dynamic ! )
Is there an improvement in clarity and détails in the medium & treble range ?
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