I have Harman Kardon speakers installed in my Cascadia. Took them out from BMW that had a rollover. Paid $500 for it. I like my Pioneer Class D mono amp. I would change the sub but I have no space in the truck(don't want to put bulky box in the cab). The head unit is almost 10 year old but I like it. I had tried to change it to something newer but none of them I liked. This old head unit performs fantastic good.