Low volume stream

[RomeFireDept]

We are using the CanaKit Raspberry Pi 4 4GB starter pro kit with the SABRENT USB External Stereo Sound Adapter . We are streaming from a Motorola APX 4000R. For some reason the transmission of the stream comes through at a low volume. We have the volume turned all the way up on the radio we stream from and the PulseAudio application. Any ideas on how to increase the volume?

 

[oldForgotten]

Any luck with this?

I'm experiencing the same low volume situation with a Raspberry Pi 4 and SABRENT USB. Streaming from a Uniden BCT15.

The feed was just setup Yesterday.

Disabling "Auto Gain Control" in alsamixer did reduced the hum.

I'm going to order the other sound card and a different cable and see if that produces better results.

 

[RomeFireDept]

Any luck with this?

I'm experiencing the same low volume situation with a Raspberry Pi 4 and SABRENT USB. Streaming from a Uniden BCT15.

The feed was just setup Yesterday.

Disabling "Auto Gain Control" in alsamixer did reduced the hum.

I'm going to order the other sound card and a different cable and see if that produces better results.

We purchased the Smof Upgraded Ground Loop Noise Isolator from Amazon and that helped with the hum and also took care of the low volume issue.​

 

[oldForgotten]

I have the Ground Loop Noise Isolator. It did reduce the hum but it did not help with the volume.

I'll see what happens with the other sound card/cable. Maybe I can find another scanner as well.

Thanks for the reply.

 

[a417]

disabling auto gain control is just a step in the right direction, what current audio settings (inc. gain) on the raspi do you have in place? You should be able to really tweak the audio settings to the point of obliteration with how flexible the hardware & OS are.

 

[DC31]

Try typing alsamixer in a Terminal window. Then use F6 to select your sound card or pulseaudio. Then F5 to show all settings. It is trial and error from here but you may happen onto something that changes your volume. If you see m or mm at the bottom of one of the columns that means muted. The m key toggles that.

 

[oldForgotten]

Thanks for the feedback.

I did not know about F5 in alsamixer. I assumed the "Mic" value I saw was for the USB microphone input. Turns out it was not and F5 allowed me to see/edit the correct input. The value was set to 10dB. I reduced this to -5dB.

I'll try different values and see what works best for my setup. The frequency I monitor is not very active.

If the Raspberry pi has a build in speaker/microphone why use a USB adapter at all? A 4 Pole 3.5mm (TRRS) splitter should work, correct?

 

[DC31]

The internal sound card on the pi does not accept input through the 3.5 mm jack. Thus the usb card.