I am in the process of gathering information about my first DIY subwoofer project. There is something I want to understand about HT-only subs: Are there any benefits for an HT sub to be: tight, fast, precise, have good transient response, low group dealy and good frequency response. all of these factors define a good musical sub, are there any need for them in HT ? My dealer told me that a sub which is meant to be used only for HT duties should have these 2 charastaristics: 1) being able to play in the highest SPL's. 2) being able to reproduce the lowest frequencies. except for these two factors, my dealer told me that all the other factors, which make a lot of difference in music reproduction, make almost no difference at all with movies. my dealer has no reason not to be honest with me, since he know that I am going to build the sub myself. Can I trust him on this ?