Kenwood 600 vs 500

Sure this has been asked before but I can't find it, so here it goes again. Has anyone directly compare A Kenwood SUPREME INTEGRATED 500 to a 600 in sound quality only at low to med. volume level. We all know the 600 has more power out but I only play at low to med. levels.

Thanks Scott

The only difference between the two is that the 600 has the extra controls for Phono 2, and more power output. Other than that, they are identical.

That's what I'm thinking too. So if I use only CD and Tuner inputs, I'm not going see hear a difference. Anyone else thinking something different