subs amp underpowered?

[BassDrop69]

lol the importance of a good head unit is always often overlooked. Good internal dacs make all the difference.

Honestly didnt even think of it being the head unit. The new one I did ground the rcas like showed the sticky thread and done a chassis ground on the ground wire connection on the harness also. Gains on both amps are much lower and it's just so much more enjoyable to listen too. I appreciate your time helping! 

 

[BassDrop69]

@shredder2  What you think of this design??

OP, any idea on port tuning?

Hey, this is still on my mind so I was researching some. Sundown recommends 1.5-2cft for ported per sa12, that would be 4cft ported max for my two. so my box being 5.25cft that would be impacting my performance too?