2 dd audio 3510s in box with 4000 watt amp dd m4000. Getting out of the trade. If you’re looking to be loud, my loss is your gain. I designed the box for competition although never competed and I have different aspirations now. Plays well from 28-42 hertz. I took photo the morning of posting. It peaks at 32 in my car. With twice the power it would easily do over 150! I don’t have the voltage in my newer car neither do I want to invest any more. Nothing wrong with these. In fact it is very impressive and sounds good doing it.