I was merely pointing out the difference between you telling someone they consume no power at idle when that is in fact a false statement. How much power they consume wasn't the point of my comment, rather it was to truthfully answer the original question.
I don't have a wall meter available, but let's say for example these speakers pull 8W from the wall while idle. That works out to be 70.08kWh over a year if they are left on 24/7, which is roughly $9.28 a year in electricity in Vancouver. While that in itself isn't a lot, it isn't trivial, and does matter to some people.