Took some videos with my two sundown zv4 12's today. Just keep in mind that these are budget amps and theyre not very efficient either!
This setup did a 147.1 with one of these amps, then I added another one today and got a lot louder to the ear but I haven't metered it yet. Also, the videos are with both amps.
Btw, Ive done a lot of modifications to the trunk since the ns-1 was in there.