Is this boxed? How are your speakers or speaker jacks mounted? Could it be you're shorting one input or speaker output somehow?
Also, what is the impedance of your speakers?
Put some pictures of your builds up. It would help to see how things are mounted and wired.
Meantime it looks like it can be done
http://www.eleccircuit.com/small-stereo-amplifier-with-tda7052/
Looks like they added a cap to remove noise.
Anyway, I think it's a cool idea, but there's similar chips that are stereo and maybe better suited to what you want to do, aside from possibly needing a voltage regulator or having different output.
Also, what is the impedance of your speakers?
Put some pictures of your builds up. It would help to see how things are mounted and wired.
Meantime it looks like it can be done
http://www.eleccircuit.com/small-stereo-amplifier-with-tda7052/
Looks like they added a cap to remove noise.
Anyway, I think it's a cool idea, but there's similar chips that are stereo and maybe better suited to what you want to do, aside from possibly needing a voltage regulator or having different output.