I did end up upgrading my speakers to higher-watt capacity and better sound. I tested this particular circuit with about 6V and it worked well. Then I tested it with 14V and about 2 minutes in powered at 14V, something smelled like it was overheating yet the music was still playing. It turns out the transistors were very hot even though the TIP41's were connected to heatsinks via nuts and bolts. I then reduced the voltage back to 6V and the circuit worked again. Only thing I may need to change is the LED resistors and/or have the music always cranked up for the LED's to respond to the music.
Is it normal for heatsinks to be so hot? I don't think the smell was normal. It almost smelled like burning plastic.
Is it normal for heatsinks to be so hot? I don't think the smell was normal. It almost smelled like burning plastic.