[JN] DACs for RPi zero W
gablebarber at gmail.com
Mon Apr 8 11:16:55 CDT 2019
Excellent insights Larry, thank you for that. I don't think I ever
actually listened to the zero/hifiberry combo. I bought them for some
experiment that I didn't end up trying, iirc at least. I'm currently
testing a tda1387 based dac hat with an Allo Kali, and pi3b+. Each
board has a dedicated, regulated 5v supply. I need to get off my butt
and set it back up in the office to give it some listening time before
I put it on the big horn system.
I was planning on using Volumio as I believe they have Tidal support
as well. I didn't realize Moode had Tidal support now, I will have to
give that a try.
The price point, even with the handful of regulated supplies I have,
is wonderfully low indeed.
On Mon, Apr 8, 2019 at 8:54 AM Larry Moore <larrymooreattorney at gmail.com> wrote:
> A really nice offer -
> I know I’ve stated this here before, but it bears repeating, the Raspberry Pi has a clock that is not an integer multiple of either 44.1 or 48 kHz. This means that it switches back and forth between two frequencies, on either side of a “center” desired frequency, in clocking data. The result is fair amount of jitter. You can look at DimDim’s website for the detailing of this:
> However, there’s a couple ways around this. One is to reclock. Another, and better still, is to run the DAC chip off a separate oscillator proximate the chip itself. This takes some knows how (software programming). In one such approach, a selection must be made between oscillators depending on whether the signal is 44.1 or 48kHz based. In another, the DAC has some “intelligence” or programing, and this form of operation is referred to as “master mode.”
> So, the DAC you offer uses none of these approaches. It’s from what I'd call the 1st wave of DAC HATs. It simply runs off of the “high” jitter clock provided by Pi. It uses a PCM5102 DAC chip from TI/BB. There are many examples of DAC HATs (hardware on top) that use the PCM5102. It’s easy, and there’s not a lot for a designer/builder to screw up - the DAC chip includes an on-board I/V conversion, and is thusly, voltage out. And, it also contains a charge pump, so it will run off a single +5 volt supply. The layout and, in particular, the charge pump capacitors are important to the sound. But, again, there’s not a lot to get wrong…. Frankly, many of these are better than the vast majority of CD players.
> First in the next or 2nd wave of DAC Hats, was the HiFi Berry DAC + Pro. This uses the PCM5122 - a programable version of the PCM5102, and has the benefit of running off of one of two oscillators, as I mentioned above. It sounds much better as a result.
> There’s also some ESS9023 DAC based DAC HATs, but personally, I always hear the on-board reclocker - not for me. Sounds like the early ESS DAC implementations you typically hear - lots of detail, but tiring, and ultimately, unnatural.
> Allo, then came out with the Boss DAC. I was a beta tester. You want a version 1.2 as there were major power supply changes between the 1.0-1.1 and the 1.2, the 1.2 being a good bit better. In my, and many others whom ears I trust, the Allo Boss ver. 1.2 is the best sounding PCM5122 DAC HAT.
> It takes major - ask me how I know - modification to a HiFi Berry DAC + Pro to get one to sound as good as Allo Boss DAC ver. 1.2. Further, you must be pretty good with surface mount soldering and be ready to throw multiple different, highly selected power supplies at the problem…. In comparison, the Allo Boss DAC ver. 1.2 is pretty much turnkey, though it too benefits from better and select power supplies. There’s an isolator board available too.
> Allo now offers a miniBoss for the PI Zero, but I haven’t heard it. I believe that’s what Bob D. Pointed to. There’s some pros and cons to the Pi Zero though, and for the difference in money, I’m not sure I’d bother. Depends on what you’re trying to accomplish…but, this can be stupid good for the money. Very, very few vintage CD players and/or transports and DACs are at this level if the Pi/Boss are set up correctly with appropriate software.
> The next major step forward in DAC HATs, and perhaps, a 3rd wave is the Allo Katana. This uses the latest generation ESS DAC chip, the ESS9038Q2M. It 2-channel DAC chip from the “mobile” electronics line. The hone or Pro chips have multiple DACs inside. I think I have a Katana completely optimized using some pretty select reasonable mods and several select power supplies - I can go into detail, if there’s interest.
> I recommend MoOde Audio. It will allow you to stream radio stations, and has the ability to be used with Tidal too. NAS or local HDDs for the rest of your files. It make you never want a tuner or CD player or transport and DAC or computer and DAC ever again, all the while allowing you to explore new music…
> Pretty close, if not, SOTA for again, stupidly low money outlay.
> Gotta run, HTH
> > On Apr 7, 2019, at 11:43 PM, Gable Barber via Sound <sound at soundlist.org> wrote:
> > HifiBerry makes one:
> > https://www.hifiberry.com/shop/boards/hifiberry-dac-zero/
> > I've got a spare one, if you want to try one, drop me a line and I'll
> > mail it to you.
> > Cheers~
> > On Wed, Jan 23, 2019 at 11:16 AM Danielak, Robert M via Sound
> > <sound at soundlist.org> wrote:
> >> Any suggestions for DAC hat for RPi zero W?
> >> I’m happy with the Allo boss on RPi 3b+.
> >> Any tips would be appreciated
> >> Thanks
> >> Bob.d.
> >> Sent from my iPhone
> >> _______________________________________________
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> >> Sound at soundlist.org
> >> http://mailman.soundlist.org/mailman/listinfo/sound
> > --
> > Regards,
> > Gable Barber-Smith
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