Hi guys, I just got into ice recently with my father's old school stuff. My father has an Orion 250sx 2 channel amp which I've installed recently to my stock  head unit car ( ranger t6) front speakers of lightning audio component speaker. And now i have two Apache 600w and 400w amps laying around with a pair of Blaupunkt Velocity VPC10D woofer. While googling for some idea to mount the woofer, I found a way to mount the woofer under the back seat ( undertray storage) and i started to do my own fibreglass woofer box. The problem with it is how do i connect my sub to the head unit when I don't want to use a preamp. Another problem is where, I'm not sure which amp I should use to power the sub because I can't find any details for the Apache Amps online.

The Orion doesn’t have any rca output 😢😢