Speaker imaging

I hate every-time it happens too (hate spider monkeys), but change can be also caused by other factors. It might be not the amount of light in the room but the fact that radio stations are required by law to lower stations power at about 6PM (propagation is better at night) reducing electromagnetic pickup.

Image is not the power of suggestion because on many records I hear sound of instruments coming from particular locations while I have no idea where they should be located. As for the glasses I suspect that when you have them on you can see your system and it makes you worrying how much money you have spent on it - that might be worse than spider monkeys.

Sound from each speaker travels to both ears with different delays creating depth of image. There are headphones that have feed-thru from one side to another while some headphone amplifiers simulate that.

Is it possible that sound from, for instance, right speaker to left ear is partially blocked/reflected by the left lens of the glasses?