I'm sort of old school and I'm used to 1 channel amps for bass. And used to using 2 and 4 channel amps for voice.. but im looking to buy taramps amps , and im confused. Lol. They all are mostly 1 channel. I see they have a smart 3, md, hd, ds, all mostly 3000 watts. What is the difference between the models? Its just a lil confusing.