NAA

Using an Allo USBridge Sig for NAA

www.diyaudio.com/forums/vendor-s-bazaar/337859-shanti-dual-lps-5v-3a-5v-1-5a-92.html#post5963277

You also need a NAA, which can be a much lower horsepower lower noise device running from a better, linear power supply.

I tried a old pi for NAA, but couldn't get the sw to install on it and run correctly.

Also tried an Allo Sparky SBC running dietpi, but had a bunch of dropouts with it, every few seconds even just feeding it 44.1k rate.

So I moved to a pi3b, and this works fine.

Pi3

I used DietPi as the OS.

If you go to https://dietpi.com/, then click on download in the top you can find a pi image for all models

Download, unzip and and write .img file to a micro sd card. I use etcher to write the sd card.

Plug in keyboard and monitor, ethernet and power on.

It takes a while for first power up, loads more software, updates sw and asks a few questions. Reboots a couple times too.

After a while, it reboots and you will see

dietpi-launcher : All the DietPi programs in one place.

dietpi-config : Feature rich configuration tool for your device.

dietpi-software : Select optimized software for installation.

htop : Resource monitor.

cpu : Shows CPU information and stats.

I recommend setting up a remote SSH interface now. This will let you control the pi without having to have a monitor and keyboard connected to it. I use Terminal with remote connection from a macbook. With a PC, I like

http://www.extraputty.com/

https://winscp.net/eng/index.php which gives you a putty interface but also supports file transfer.

I would start with extraputty though.

All of the following can be remotely.

dietpi-software

You will see the menu below

Select "Search", then search for "alsa", and select.

Search for "naa" and select.

Install software, and reboot.

dietpi-config

Select "Audio Options"

Select Audio Options

Select Soundcard, then pick your soundcard.

If you select "DietPi-JustBoom", you get this

IMPORTANT

PSU noise reduction turns off the monitor output, so setup a SSH interface before you do this, otherwise you won't have an interface.

exit to go back on config screen

If you don't use wifi, you should turn it off.

Select "Network Options: Adaptors" to get the onboard wifi option.

Select "Back" to exit

To check if NAA software is running:

sudo systemctl status networkaudiod

If you have a problem, you get something like this:

networkaudiod.service: Failed with result 'signal'

NOTES

aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 []

Subdevices: 0/1

Subdevice #0: subdevice #0

Tweaks

https://github.com/dynobot/Linux-Audio-Adjustments

dietpi-config > Audio Options > PSU Noise Reduction : [On]

Turns off HDMI output and CPU Gov = powersave (CPU frequency = 600 MHz)

dietpi-config > Advanced Options > Max USB current : [Off], Bluetooth : [Off], I2C state : [Off]

dietpi-config > Advanced Options > Serial/UART : Manage available devices

Turn off all consoles and devices

dietpi-config >Network Options: Adapters

Turn off onboard wifi

Turn off HDMI output

dietpi-config > Display Options > Resolution > Headless to have this done automatically on boot.

NAA image

https://www.signalyst.eu/bins/naa/images/

flashed your NAA image to a new card, added "dtoverlay=hifiberry-dacplus" to the end of "config.txt"

More tweaks

cd /DietPi

sudo nano config.txt

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