Its like anywhere else,Its all about experiencing and actually experiencing for yourself from trial and error.Not everyone knows everything, and alot is always argued as well as not agreed upon.Ive found that alot generally read on certain forums and gain opinions rather than experiencing for themselves and give that information out.He said / She said/I read kinda stuff.Ive been installing since the early 80s when you had to use low level inputs by wiring direct on amps which was a time consuming effort and you had to make sure where that wire went and what polarity( of which is not done today, if so its quite Rare)and can still be done if the connectors are provided, but most days its RCAs and go on with it.Things have evolved and still do and learning by experiencing is about all the information I give out. Wheather its amps, subs, speakers, or HUs ive used brand wise personally or what I have had the pleasure to experience.majority of the DIYMA group I had the pleasure to meet in Plano were some pretty intelect and very informative people,and as anyone..You choose to gather what information you want.Just my 0.02$ Ill deff say that I dont know everything for my age and experiencing, buy I am still willing to learn..especially from those that are experiencing,and all the new technology going on..Blutooth ect