"The back panel on this sub rattles worse than a trunk on a lowrider, rattles so loud that it can be herd over the sub and mains. The effects create a rumble thru the speaker with nothing pluged in at all. I received this brand new in the box last week and Mackie says I have to travel 60 miles to a repair center for repair, so a F- for customer service. I do not recomend this sub at any price"