I sincerely appreciate the time you take to answer naive questions. You are an effective teacher. Other beginners will surely learn from applying the theoretical concepts you describe through this forum in a practical sense- i.e. understanding the ideas in the context of their projects. Digesting 'Pi speaker alignment theory', however, will take a bit more time! In summary, Omega 15 and bass cabinet as per plans; supplement the system with (multiple) sub-woofers. Got it.