Sound capabilities of the RasPi3
today I connected an audio jack into the RasPi to connect it to an active loudspeaker. Jesus, what is that for a disappointing noise during playing any sound that comes out of the speaker. First I thought that I didn't connect the jack correctly, but even after I checked that the jack is inside the hole completely, and tried another cable also, I understand that there is a static noise starting nearly a second before and stays a bit longer than the sound that the soundcard has to produce.
My question: is that normal? Does the soundchip such a bad job or do I have another problem - unshielded connection, e.g.?
I found some USB sound cards that are should work with a RasPi, but will they work with Emteria Android as well?
Did someone use one of them already and has a recommendation? e.g. "https://www.rasppishop.de/USB-Soundkarte-Soundadapter"?
Many thanks and best regards,