I'm wondering that myself. I have never heard of anything that loses at the kick but I'm pretty sure some vehicles gain only a little.
I won a bass race against a 15 on double my watts using 2 8s once. He actually quit before through the race even began after his 15 inch setup was put against mine in the first round. My 8s only hit 139.7 on initial metering that day, which was actually perfect for a bass race. He was just so mad that he was put into the same class as 2 8s. Full grown men can get nutty with this stuff.
You could try a loading wall if you have the room. I did a loading wall on my 2 DD 8s in my s10 and it made a decent difference. I basically just built a panel a few inches from the front of the subs. I never did meter those subs to test if there was a difference, but it sounded better.
I seriously looked at those for my setup. I still haven’t chosen. I went with my sound quality daily driver build first, which I always do, but I made sure I have plenty of power in reserve. I’m running a 300 watt sub on 1400 right now. And 2/0 gauge wiring reduced down to fit everything in case I want to jump up to 2000-2500 later, the wiring is already solid for it. I’d really love to try 8 of these Dayton audio ultimax 8s sealed on 2500. These things get nasty on 300 watts.
