First and foremost i am an M.E.C.P certified installer, been in the business since Sansui was a brand. If it's out there I've probably ran it amp, sub you name it. I've run my first skar audio with four ix8" and damn! Look at my review, now building a new set up with vvx-v3's and soudigital once again the single sub I have now kills so much out there it's unbelievable the price point you cannot beat point blank..... Try em.
3 vvx-8s in a sealed enclosure, RP-1500 to the subs, RP-75.4 to Skar 6x9 in the rear, 6.5 up front with Skar SPX-T tweeters. Very impressed with the sound in my work vehicle.
Newly back into car audio. This little 8 bangs. Tried it in a few boxes. Worked better in the longer one. The short one with plexiglass hit very well but only around 40Hz and everything else was a little lacking. The long Transmission Line box hits all the wag down to 20 and up. Hardest at 39.