G2 G2Link User manual

G2Link
DAC Streamer
user manual
revision 1.0

Table of contents
Page 2
11
5
10
4
11
6
3
4
12
12
8
4
4
4
7
11
4
Audio renderer
Block diagram
BubbleUPNP
Conguration
Firmware
Get started
Included in the package
Input protocols
Locate the IP adress through BubbleUPNP
Locate the IP adress through mconnect Player
mconnect Player
Outputs
Overview
Power requirements
Soware
SSH Credentials
Technical details

Included in the package
1x G2Link DAC Streamer
Page 3

Overview
G2Link DAC Streamer is developed by G2 Labs and is a product by enthusiasts for enthusiasts. G2 Labs vision is
to deliver products without compromise to the parts of great importance. at is why each component, in terms
of both hardware and soware, is carefully chosen, developed and listened to. e product is a result of many
years of development and has been run through hard and long tests before released on the market. Each internal
section of the circuit has custom made, dedicated power supplies. ese are constructed specically for audio to
seperate electrical noise from the digital to analog conversion. e soware is equally thought through and kept
minimalistic to not stress the processor more than necessary and in return keep the ground noise oor as low as
possible.
e D/A Converters are dual 24-bit stereo audio DACs with integrated op-amp drivers, powered by the industry
proven Sabre DAC technology. With Time Domain Jitter Eliminator, the G2Link DAC Streamer delivers jit-
ter-free studio quality audio. Designed without the need for output dc-blocking capacitors, it is of course pop-
noise free.
G2Link DAC Streamer can be used either in a single end (RCA) or a balanced (XLR) setup. It is prepared for
plug and play to an existing Local Area Network and works with multiple playback protocols and lossless formats
with streaming services like Qobuz, Tidal, Roon and of course a NAS. To get the most out of the G2Link DAC
Streamer we recommend using a balanced stereo setup and stream preferably Wave les from a NAS.
Power requirements
5VDC (PSU is not included)
Conguration
G2Link DAC Streamer doesn’t need any hardware conguration.
Technical details
PCM up to 24-bit/192 kHz
DSD up to DSD512
DNR: 112 dB
THD+N: 0.002 %
Interchannel Isolation: 100 dB
Protocols
UPnP/DLNA
Roon
Airplay
Inputs
5VDC
Ethernet
Outputs
L/R Balanced XLR
L/R Unbalanced RCA
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Block diagram
Simplied technical block diagram
Page 5
Processor
SPI ash
eMMC
ETHERNET
Jitter
reduction
PCM
interface
Hyper-
Stream
DAC (2x)
2Vrms
driver
Power regulator
Power supply
5VDC
AOUTL +
AOUTR +
Jitter
reduction
PCM
interface
Hyper-
Stream
DAC (2x)
2Vrms
driver
Power regulator
AOUTL -
AOUTR -
Power regulator
Ethernet
interface
EMMC

Get started
It’s easy to get started with G2Link DAC Streamer. Simply follow the below steps:
1. Connect an Ethernet cable from your Local Area Network to the RJ45 port.
2. Connect either L/R Balanced XLR cables or L/R Unbalanced RCA cables to your amplier or active speaker.
3. Connect a 5V Power Supply to the DC input (power supply is not included).
4. Aer a minute you will be able to nd your G2Link DAC Streamer among your network devices.
5. Use preferred service and enjoy.
RJ45 port
5VDC input L Balanced XLR R Balanced XLR
L Unbalanced RCA R Unbalanced RCA
Page 6

Soware
Once G2Link is connected, up and running you can use dierent soware and protocols to stream your music.
For handheld Android devices we recommend using BubbleUPNP or BubbleDS app. For handheld IOS devices
we recommend using mconnect Player Lite, mconnect Player or mconnect HD.
Simply follow the below steps to get started
1. Download and install one of the following the apps:
App Store (IOS)
mconnect Player Lite (free)
mconnect Player
mconnect HD
Google Play (Android)
BubbleUPNP (free)
BubbleUPNP License
BubbleDS
2. Make sure your handheld device is connected to the same network as your G2Link DAC Streamer.
3. Follow one of our app guides on the following pages to get started with your handheld device.
GET IT ON
GET IT ON
Page 7

1. Start the app 2. Click “Play to” 3. Select G2Link 4. Click “Player” and check
the volume level is not too loud
5. Click on the “Gear” icon 6. Choose “Cloud Setup” 7. Make sure the services you want to
use are active. Eg Qobuz/Tidal and return
mconnect Player
Instructions to get started with mconnect Player IOS app
8. Click “Browse”
9. Choose your preferred streaming
service and sign in with your credentials
10. Click the menu icon 11. To search for music click “Search”
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12. Write search criteria. Eg artist,
album or title and click “Search”
13. Choose how to lter your result by
Artis, Album, Tracks or Playlists
14. Choose one of the results to play 15. During play you can pause, skip,
back, stop, change volume, etc.
16. Tip! Click on volume icon to change
sensitivity of the volume slider
* Remark
mconnect Player is a third party soware which can not be supported by G2
Labs.
is is a simplied guide to get started. mconnect Player app GUI can look
slightly dierent depending on your handhled unit and version of the app.
For more support and guides please visit the soware developers website and
ocial support:
http://www.conversdigital.com
http://www.conversdigital.com/kor/product/product04.php
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1. Start the app 2. Click on the devices icon 3.Select G2Link 4. Click “More”
5. Choose your preferred streaming
service and sign in with you credentials
6. Use the physical volume buttons and
check the volume level is not too loud
7. Click on the search icon 8. Write search criteria. Eg artist, album
or title and click the search icon
9. Choose how to lter the results by
Albums or Tracks and choose a result
10. During play you can pause, skip,
back, stop, change volume, etc.
* Remark
BubbleUPNP is a third party soware which can not be supported by G2
Labs.
is is a simplied guide to get started. BubbleUPNP app GUI can look slight-
ly dierent depending on your handhled unit and version of the app.
For more support and guides please visit the soware developers website and
ocial support:
http://www.bubblesoapps.com
http://groups.google.com/g/bubbleupnp
http://forum.xda-developers.com/showthread.php?t=1118891
BubbleUPNP
Instructions to get started with BubbleUPNP Android app
Page 10

Audio renderer
G2Link DAC Streamer is the result from many years of development and each component, in terms of hardware
and soware, is carefully chosen.
G2Link audio renderer is running on Linux OS on a single board computer, which uses a Rockchip RK3308
processor.
e OS is a minimalistic Ubuntu compilation and our approach is to both support and use open-source code.
e G2Link DAC Streamer is prepared with several rendering soware. GMediaRender which supports UPnP/
DLNA and Shaiport Sync which supports Airplay. On top of that the G2Link DAC Streamer is Roon ready which
in turn oers multiple protocols with a wide exibility.
Since we use open-source we also provide the ability to SSH into G2Link DAC Streamer to give the ability for
developers and DIY’ers to customize and develop the soware.
Note that we support but are not responsible for bricked products. SSH is done on own risk.
In case a product is bricked we can oer our most updated rmware image and instructions how to re-install it.
SSH Credentials
Username: rock
Password: rock
Localisation of the IP adress can easily be done through any of the apps we recommend. Use the steps on the
following page.
Firmware
We develop and improve our products continuously. is is an ongoing work and we will oer current and future
rmware updates through the web link below.
downloads.g2labs.org
Page 11

1. Click on the info icon 2. e IP adress will show here
Locate the IP adress through mconnect Player
How to easily locate IP adress of the G2Link DAC Streamer
1. Click on the icon of your G2Link 2. Click “Info” 3. e IP adress will show here
Locate the IP adress through BubbleUPNP
How to easily locate IP adress of the G2Link DAC Streamer
Page 12

g2labs.org