Correct, and with that, the gentler the filtering, i.e. the less damaging is the filter used to things like Phase and accurate transient response. Total win.
Give HQ Player a try.
MPD is usually the one used on Linux. Haven't been able to experiment much with it so far though.
There's much more that could be said to explain why I will never recommend JRiver and that I do not consider it an audiophile player. Lots of relevant posts over at ComputerAudiophile.com.
IF there is DC , yet to be determined, a cap will get rid of it. If thats too simple run the DC straight into the grid of a simple SE tube stage, and adjust the bias to allow for the DC on grid.
There will be DC present, around 1.6V.
There are a few people experimenting on this thread so hopefully we'll start to build a picture of what works well and what doesn't. I'll progress the build I outlined and try a simple Italian style filter too as my contribution.
Ray
Glad you could join us!
If we make an assumption of minimum rate of DSD128, what filter would you use?
Ray
Ok use a low Rp tube like 7788, 6E6P etc. Adjust bias resistor , or whatever you want to use to compensate for 1.6V on grid. Use a step down tranny, in parafeed or on the plate. Drops gain , gives low output impedance- perfectimo!
Have you built it? If so, how did it perform and can you share a schematic. I'm sure there will be interest here.
Ray
Good question, Ray. Maybe a look at Jussi's Open-hardware DAC has a good answer. I think Abraxalito also offered some good advice in my relevant thread about it.
In that thread, in addition to the 'autoconstruito' Italian pdf, if I remember correctly, I also linked to a Japanese web page (can't find it again now...) with a design having similar goals, as well as that of our fellow member Koon who did something fantastic as well in that vein.
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So, I listened, researched a bit more and will take an approach similar to that you outlined...
For a first cut 'prototype' though I'll probably use an 'Italian style' filter plugged into a JLSounds JG buffer board.
Ray
Interesting post on computeraudiophile on the ifi nano idsd
quote
DSD playback is native. No processing whatsoever. DSD goes straight to the output switches, to the selectable (third order, I believe) analog filter, then to the gain stage. That is it. Voila. Native DSD. And it sounds great.
unquote
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DSD playback is native. No processing whatsoever. DSD goes straight to the output switches, to the selectable (third order, I believe) analog filter, then to the gain stage. That is it. Voila. Native DSD. And it sounds great.
unquote
Update from my journey.
Last week i listen to my first DSD player. Windows 7 with foobar and the plugins you need to drive the amanero board. i used power supply from usb and first order filter with lundahl transformer. I did not like the sound, it had no dynamics and no detail. it was also very difficult to get a flat frequency respons with the transformer.
This week i build a isolator for the amanero board with iso7640fm ic. After the isolator i use a fourth order filter. Because of little humm problems in my first setup, i try in this setup , salas shunt 5v for amanero, Salas shunt 5v after isolator. Just waiting for some smd parts for the isolator board, but below a photo from the isolatorboard and filter.
Last week i listen to my first DSD player. Windows 7 with foobar and the plugins you need to drive the amanero board. i used power supply from usb and first order filter with lundahl transformer. I did not like the sound, it had no dynamics and no detail. it was also very difficult to get a flat frequency respons with the transformer.
This week i build a isolator for the amanero board with iso7640fm ic. After the isolator i use a fourth order filter. Because of little humm problems in my first setup, i try in this setup , salas shunt 5v for amanero, Salas shunt 5v after isolator. Just waiting for some smd parts for the isolator board, but below a photo from the isolatorboard and filter.
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As mentioned before is the power supply very important. I have made a PCB with seperate low noise supply for USB/Amanero and Isolator/Filter. Analoge output is about 3.5Vrms at 2.25V dc level. You will need to ad a capacitor in the output to filter out the DC.
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Hi Supra, taking your steer, I'm working on two DSD 'decoder' projects.
The first will be a very simple filter based on the 'Italian job', then a cap and using a simple relay circuit to mute output between tracks etc. followed by a JG output buffer. I hope to have that running by this time next week. The aim is to get a flavour for this approach to DSD playback.
Assuming it proves worthwhile I'm also looking at an active filter and output buffer using tubes, utilising the DC offset for bias as you suggest. One observation though, the DC is only present on the output when there is a DSD signal; thoughts?
Ray
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Most of the time there will be dc, right? The small amount of time there is no dc want do any harm, as there is still bias provided by the resistor on cathode, or whatever bias method you use. If your uncomfortable with that just use a cap.
Thanks Supra. Yes, there will still be a cathode resistor providing bias; just looking for reassurance that the absence of DC for periods of time wont introduce other problems. If I can manage without an extra cap I would prefer to do so.
Ray