Heh. 
I just want to understand what's going on in the circuit. A friend of mine has one of those 7W amps that he has two 4 ohm speakers connected in series. When he cranks the volume up, the sound becomes all distorted. I don't want that to happen with my circuit and I want to understand what's going wrong with his so I can help him correct it. I've told him to try hooking up just one speaker if he wants more volume, but not to connect two in parallel out of concern for damaging his amp with a 2 ohm load. But beyond this advice, even with all I've learned about amps while designing this circuit I'm still at a loss to explain the issue he's having with distortion. He's certainly not exceeding the wattage rating of the speakers he's using; they're pretty nice ones.
He's using this amp btw:
http://www.unisonic.com.tw/datasheet/TDA2003.pdf
Witha a 12v supply. 4 ohm speakers, and this sound chip is providing the input:
If I understood why he (and almost everyone else using this setup) was having problems I'd feel a lot more confident that people won't have problems with my setup. My best guess right now is that the sound chip has a PWM output and that's messing with the amp. Some have tried adding a low pass filter between the sound chip and amp though and one some have met with success using this.