I agree with the guy above.
Also I just happened to try this the other day. Except I closed my eyes first, and then took off my glasses. Sounded exactly the same. So the sound wasn't changing. Taking them off while still open blurs everything visually, doesn't change the sound at all, but does seem to allow the brain to believe more that it is closer to really being there.
Also I just happened to try this the other day. Except I closed my eyes first, and then took off my glasses. Sounded exactly the same. So the sound wasn't changing. Taking them off while still open blurs everything visually, doesn't change the sound at all, but does seem to allow the brain to believe more that it is closer to really being there.