Love this thing, running 3 Sundown audio SA V.3 8s, in a 4.2 cu^fr box tuned to 29hz with a 44 sq^in port @1.33 ohms, people have covered their ears lmao at gas station people come up to me asking how many 15s I have in my car ???????? Im like nope just 3 8s in a custom box. And these subs take all the abuse no problem and they are only rated for 500rms each and they take the beating like a champ!!!! Sundown is super underrated so Im not worried, and the high amp alt and the lithium battery bank keep my voltage well about 13.3, tried the amp in my buddies car on stock electrical just to see what it would do and the car turned off LMAO This thing pulls a lot of juice