You can add a bazooka tube but only 100 watt models. bt something get the 10 inch .I have the 8 inch bazooka there isa plug that you buy buy from bazooka that plugs into the amp . Thats all you need is the plug for the jbl system there are two of them that you need. The only hard part is getting to the amp. This will not be earth shaking bass like 2 12's .This is the cheapest way to add bass to your jbl system and you can do it your self .