I just tested this. Sounds very nice, lots of more ambience and more natural. I think the DC offset on the LDRs contributes there, it may also help with their nonlinear conducting properties. Or maybe it's just the missing coupling cap. Whatever.
Still, when I turn the volume knob I do see the woofers bounce because of the huge DC bias change. I better go easy on volume changes. There is also some low scratching noise from the potentiometer, even I bypassed the LEDs with 15uF caps each - but probably that's not enough.
Anyway, great idea - and absolutely free