How to setup crossover frequencies etc

SuBXeRo

You really need to use real mics and recording equipment. Would be interesting though to compare your phone records vs real equipment.

The two ohm loads are usually fine as long as you aren't driving things super hard. Harder you run it the more that the amp generates. Its not a consistent 2ohm load either and constantly varieS.

You can find some really good extended range or full range drivers. Check out parts express