You are aware getting used to it is actually just a nice word for hearing damage right? Plus if you've never sat in a car doing 155 you have no idea how stupidly loud that would be, especially on music. Honstely if you can get used even setting in 150 on music and not have it bother you or seem that loud you've really ****ed your hearing up badly anyway. Anyway do a wall, figure out how many cubic feet and baffle space you have and go from there. I'd do at least 4 15's probably six if you can afford it and fit it. Getting high scores on a small amount of equipment can be done, but it requires a high output box which limits the bandwidth you can do it at. 155 at one peak frequency and a 155ish average are two very different things, you want the latter. Plus you'll be able to pound on it and not worry about breaking it that way.im setting the goal high because it will be my last install ever probably... so i wanna make it loud enough that it will take me years to get used too