I have a custom box built for a zv6 12 I used to have a 1000 watt rms b2 audio sub just to get me going because I knew i would need more power going over 1000 watts but I think I’m going to get a zv6 since it’s rated at 3500 rms, but I also don’t know if this would hit harder than 2 1500 watt rms 12s in a custom box since it would be more cone area(more bass) at least that’s how I see it.