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 Post subject: Re: ISO 10487 sound connection
PostPosted: Thu Oct 13, 2016 8:16 pm 
Joined: Fri May 22, 2015 8:46 pm
Posts: 331
Splitter is not intended to use this connector , is to separate audio and video from HDMI , since it is done you can plug rca cables to an amplifier , there are small cheap digital amplifiers from the amplifier cables are attached to speaker and all sound stuffs .


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Mon Oct 17, 2016 1:26 pm 
Joined: Sun Sep 25, 2016 11:27 am
Posts: 21
Elias Alves wrote:
Splitter is not intended to use this connector , is to separate audio and video from HDMI , since it is done you can plug rca cables to an amplifier , there are small cheap digital amplifiers from the amplifier cables are attached to speaker and all sound stuffs .

Hi finally I followed your steps and bought an HDMI splitter. I attach the image

Now my problem is how to connect the audio rca to the car audio wires and how can I connect the 5v dc input to my car.


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Mon Oct 17, 2016 2:22 pm 
Joined: Thu Sep 22, 2016 12:24 am
Posts: 57
You would buy RCA cables and cut them, then attach them to the car stereo wires. As for power, you will need a power supply, such as the Mausberry Car Switch to power it, using one of the two USB outputs. You could also power it from the PI if the amp requirements were low enough.


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Mon Oct 17, 2016 5:51 pm 
Joined: Fri May 22, 2015 8:46 pm
Posts: 331
Be aware of there are things related to impedance of speaker . If i were you i would use a car amplifier and connect rca cables to it. The question about power source to splitter : i used the same as used to power my PI . Look at my hardware list :

hardware-list-t647.html


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Mon Oct 17, 2016 6:01 pm 
Joined: Sun Sep 25, 2016 11:27 am
Posts: 21
Elias Alves wrote:
Be aware of there are things related to impedance of speaker . If i were you i would use a car amplifier and connect rca cables to it. The question about power source to splitter : i used the same as used to power my PI . Look at my hardware list :

hardware-list-t647.html


Thanks so much Elias, and thanks too for your hardware list.
More or less we have the same, just that maybe as you say, will be better to use a car amplifier instead of my amplifier card. This one makes a little noise.
I will need a cheap 4 channel car amplifier. Somebody can suggest anyone?
After that if everything works I'l publish my hardware list too, with pics of the project


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Mon Oct 24, 2016 2:19 pm 
Joined: Sun Sep 25, 2016 11:27 am
Posts: 21
Anything is wrong. If I connect the hdmi splitter to my amplifier via rca theres a big buzz so I can't hear nothing.
Otherwise if I use the 3.5mm audio of raspberry to my amplifier there's a small noise (white noise).
Anyway when raspbian loads it starts the noise.
My amplifier is that I showed in the first pic. Any Idea?


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Mon Oct 24, 2016 7:05 pm 
Joined: Thu Sep 22, 2016 12:24 am
Posts: 57
Did you set kodi to play audio via hdmi?


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Tue Oct 25, 2016 6:57 am 
Joined: Sun Sep 25, 2016 11:27 am
Posts: 21
arusia wrote:
Did you set kodi to play audio via hdmi?

Of course, now I'm thinking that's an impedance issue. I've been looking for information and car speakers has an 4ohm impedance and desktop speakers 8ohm. Keep in mind that raspberry its just a computer, not a car radio. Am I wrong?


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 Post subject: Re: ISO 10487 sound connection
PostPosted: Wed Nov 02, 2016 11:48 am 
Joined: Sun Sep 25, 2016 11:27 am
Posts: 21
Finally it worked as Elias said.
I bought a new 4 channel car amplifier Sony XPLOD 444w(https://www.sony.es/support/es/product/XM-444) and an HDMI splitter connected to the Sony car amplifier with an RCA cable.
I think it's the best solution because the sound its perfect with no noise

Now the problem arrives when I try to connect the radio module to the car amplifier.
The radio module is connected from the SI4703 3.5mm radio output to my RCA car amp'lifier input. While Rapsberry is loading it makes a lot of noise. I can hear the radio but If I change to music, the noise continues

Is there any way to output the radio sound directly to hdmi, instead from 3.5 mm output?


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