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BackinBlack View Drop Down
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Points: 2020 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2018 at 7:22pm
The Audiophonics case looks good and requires little extra work.
I had considered modifying the plastic PiHut Touchscreen case, which is not so refined but only £15 or perhaps a console style enclosure.
Bearing in mind the amount of work required I think I might go for the Audiophonics after all.
Anything for an easy life these days!

Ian
Just listen, if it sounds good to you, enjoy it.
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Ash View Drop Down
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Points: 4334 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2018 at 7:24pm
Yes Graham, not sure why the RPi designers thought potentially drawing >2A of current though a tiny micro-USB was a good idea, especially when the peripherals that can be connected to the main board use a larger USB-A and will individually draw less current... I would opt to solder larger connections to the power rails, I think.
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Ash View Drop Down
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Points: 4334 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2018 at 7:28pm
Regarding case, I'd prefer something metallic for heat dissipation and electromagnetic shielding.

There are some different variants of these Raspberry audio circuits so I will have to draw some comparisons. And WTF at the amplifier circuit without a heatsink??!


Edited by Ash - 10 Dec 2018 at 7:31pm
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BackinBlack View Drop Down
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Points: 2020 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2018 at 8:58pm
Ash, although the micro b usb connectors are only rated at ~2 amps I have had not experienced overheating problems. However there are other ways of delivering power to the Pi, providing you have a good stabilised and regulated supply.
The disadvantage of a metal case is the reduction in the efficacy of the WiFi and bluetooth aerials buit into the board.
When you refer to the amplifiers without heatsink, these are generally digital class D amps which have quite high efficiency, hence no heatsink. I have used both HiFiBerry and iQAudio amp hats in my workshop, for their size and cost they work well.

If you are intent on using your Majestic (or Bitzie) DAC the options are either use USB out from the Pi or one of the many Digi Hats to provide SPDIF. These range from basic convertors to full reclocking with 2 oscillators. Output isolation is not necessary as the Majestic has an input isolation transformer.

Ian

Ian
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Points: 4334 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2018 at 10:05pm
Thanks for all of your information Ian. My objective is the highest sound quality possible from digital audio. I wish to shield from EMI as much as possible (otherwise I'd select a standard desktop PC for music) so I'm fine with selecting a metal case to enclose it. If I need to install updates from the internet, I can use either Ethernet cable or open the case temporarily if I need to use Wifi/Bluetooth effectively. But the only data streaming I'm interested in is via cable. The Majestic has certainly proven its worth, in my mind, so I want it in the system. Delivering it the most unaltered digital signal is my plan. No CD drives, no wifi, no CPU fans, no poor quality power supplies. As for USB vs S/PDIF from RPi, I will have to compare them.
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Ernie View Drop Down
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Points: 386 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ernie Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec 2018 at 11:19pm
Ash, have you considered just buying a good streamer? You’ve bought yourself some very expensive headphone/ear speakers  and you want to listen to a £80 RPi set up.

By all means try it but I doubt you’ll get the results you desire. I have a Cy##s Stream X Signature and it’s head and shoulders (and knees and toes for that matter) above the Pi (though the app is bloody awful compared to Volumio! Operates like 4 year old put in together).
There are 10 kinds of people. Those who understand binary and those who don't.
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Originally posted by Ernie Ernie wrote:

Ash, have you considered just buying a good streamer? You’ve bought yourself some very expensive headphone/ear speakers  and you want to listen to a £80 RPi set up.

By all means try it but I doubt you’ll get the results you desire. I have a Cy##s Stream X Signature and it’s head and shoulders (and knees and toes for that matter) above the Pi (though the app is bloody awful compared to Volumio! Operates like 4 year old put in together).


The main problem with "proper hifi" maker's streaming kit is that you're fine up until the arbitrary point where they decide they're not going to support it any more (usually about the time where they decide it's time for you to buy a new box from them).
And then the bag of nails control system they threw together becomes even more frustrating because it can't keep up with the delivery method changes a service provider has just implemented.
I would suggest giving mainstream brands a very wide berth.

I have been using Squeezebox Touch players for a long time now, and they deliver daily.
I run the server on a RasPi (I use piCorePlayer), and the server accesses my local library (on a NAS), and offboard servers equally well, and sound quality is truly excellent, as are the various ways of controlling the players.

I am very impressed with Orange Squeeze as an Android controller app specifically meant for LMS and Squeezebox, but also capable of controlling Innous Zen products too.
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