There is some distortion when the volume and gain pots are set to maximum. Try setting your MP3 player to maximum and backing off the volume and gain in the amp.I tried using a mp3 player and a 4Ω speaker (blastking YD10360PF) like you suggested.
I'm getting to much noise from the speaker when I raise the volume and gain pots.
I don't mind the low volume but I'd like a more clearer sound.
some possible reasons:
I'm using linear pots for volume and gain. I couldn't find log pots.
the speaker is 50 watt, 4 inch, 5 oz. to big maybe?
from the pics I posted: to much spacing between the components?
The linear pots are okay. They may be a little harder to adjust, but they don't contribute to the distortion.
I think that a smaller speaker would present less of a load on the LM386. I use a 2" 4 ohm speaker regularly with no distortion at normal small room volume.
If you are using a 9V battery, the amp's distortion will increase when the battery voltage drops. Try a new battery.
Here's a picture of my little amp that I use quite often in my old pickup truck to listen to my MP3 player.
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