Debian - Speaker / Audio output Level


#1

Hi folks

I’m am using SPKR outputs on the analog expansion header on dragonboard. I can get audio coming out but it is at very low level…I checked the usual alsamixer settings and all seems to be at max level.

So, do these outputs need a audio amplifier after the SPRK pins and before the speaker ?

thanks


#2

hi,

can you please provide more details about which release/version you are using?

thanks


#3

No problem. I’m using Arrow Snapdragon

I’m using Debian build 110


#4

Hi,

Can you give me more details about the speaker you have connected, like ohms and the class.

Db410c can drive class D 4 or 8 Ohms speakers.

also can you try this on the command line.

amixer set ‘RX3 Digital’ 100%

This will increase the speaker gain to max.

thanks,
srini


#5

its a small (40mm) 0.25W, 8 Ohm speaker.


#6

Hi,
Speaker specs looks Ok, it should work with no issues with db410c.

Did changing the RX3 volume by below command help you with volume issue?

amixer set ‘RX3 Digital’ 100%

–srini


#7

no that did not make a difference.

I did just add a small audio amp before the speaker … now I can hear audio properly


#8

I do not know if something could be linked to Android, but on Android the volume is at max or OFF. There is no mix possible. Anyone experienced this too?


#9

Hi

i’m tring to use speaker on Dragonboard 410c
"lm80-p0436-43_stereocontaudioroutappnote"
the connect is ok,but i cannot get outputs
the speaker is 8 ohm 2W
should i change it ?
or can you show me how you config?
i’m using the linux on the board


#10

OK
the 8R/0.25W speaker works well
and i add a small amp like this


i can hear the audio properly too.