Good evening all! What frequencies does the SSD12 with copper coils play the best? I have it in a 1.5^3 ft sealed box and I'm not sure what to set the subsonic filter and the low pass crossover at? I'm powering it with a soundstream rubicon 702 which also has another kind of feature, hawkins bass control. I think it's a combination subsonic filter with booster. Any advice would be great.

Im trying to figure out, what kind of question that is.

I'd assume it could play 20hz-60hz(80hz if thats for you) all well, if setup correctly.

the sub sonic filter is more for a ported box. It filters out frequencies below the port tuning to prevent damage to the sub. Since you have a sealed box not so much a big deal for you. As for the cross over that's up to you