Did it come with a birth sheet?
Does the birth sheet show that this amp is underrated or does it do a true 500 watts to the sub?
I am just trying to decide if the JL would be a worthwhile buy. It is an expensive amp and 500 watts is impressive for the sub channel as is, but if it does more like 600 watts because it is underrated, I may go that route.
I don't have a lot of JL experience so I thought I would reach out.