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amplifier-adjust.md
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# Adjust Gain in Amplifier
A while ago I bought 3 Up2Stream Amp v2 devices (v1.1 is printed on the pcb). They are working well, but I have a problem with the power control with the one that is installed in my Sauna. When I'm relaxing there I'd like to hear soft music or nature sounds, but even at volume level 1 (on a scale from 1-100) it's a bit too loud. I have asked Arylic support and they were really friendly and explained a way to solve my problem:
A while ago I bought 3 Up2Stream Amp v2 devices (v1.1 is printed on the pcb). They are working well, but I have a problem with the power control with the one that is installed in my Sauna. When I'm relaxing there I'd like to hear soft music or nature sounds, but even at volume level 1 (on a scale from 1-100) it's a bit too loud and its difficult to use the slider in the app when you only need values 1-5, but not the rest from 6-99. I have asked Arylic support and they were really friendly and explained a way to solve my problem: you can swap resistors, and that will adjust the gain of the amplifier directly. You can refer to the specifications of amplifier chip TI3116 from Texas Instruments.
: they are just too loud with my speakers that I have installed in the ceiling. I have set the volume to 1 or 2 via 4Stream app and with API commands already, e.g.
set volume to 1:
curl 'http://192.168.1.64/httpapi.asp?command=setPlayerCmd:vol:1'
show volume:
curl 'http://192.168.1.67/httpapi.asp?command=setPlayerCmd:Vol--'
but I'd like to reduce the volume even more. Is there any way to reduce the volume, e.g. with a special API command that lowers the amplification in the MV8064 chip to e.g. 20 or 30% or by changing a resistor on the mainboard that will lower the amplification? It would be great if there is an option to reduce the "master" volume to use the full volume control slider in the 4stream app / range 1-100 via API. Currently 10 is already very loud and it's difficult to set 1 via app. This might also help other customers to adjust the volume with different speakers in a multiroom setup so that the volume is on the same level with the same value for volume control.
Kind Regards,
Jan
See data sheet https://www.ti.com/product/TPA3116D2
In chapter 7.3 Feature Description, especially 7.3.1 Gain Setting and Master and Slave you find the following information:
ANSWER:
Hi , dear sir . Thanks for your mail .
You can swap resistors, and that can adjust the gain of the amplifier directly.、You can refer to the specifications of TI3116
Thanks
Kathryn / Customer Service
info@arylic.com
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TPA3116D2 data sheet:
7.3 Feature Description
7.3.1 Gain Setting and Master and Slave
Mode Gain R1 R2 Impedance
-----------------------------------------
Master 20dB 5.6k open 60k
Master 26dB 20k 100k 30k (default setting for Arylic PCB)
Master 32dB 39k 100k 15k
| Mode | Gain | R1 | R2 | Impedance
|-----------------------------------------
| Master | 20dB | 5.6k | open | 60k
| Master | 26dB | 20k | 100k | 30k (default setting for Arylic PCB)
| Master | 32dB | 39k | 100k | 15k
R1 in TPA3116D2 data sheet is R19 in Arylic PCB and R2 is R18
To set and verify volume control, use these API commands:
```
# set volume to e.g. 1:
curl 'http://10.1.1.52/httpapi.asp?command=setPlayerCmd:vol:1'
# show volume:
curl -s 'http://10.1.1.52/httpapi.asp?command=getPlayerStatus' | jq
```
See https://developer.arylic.com/httpapi/#adjusting-volume