The Premium sound option allows you the normal bass, mid and treble settings, plus in addition it has a (7?) band equaliser which you can also crank up to get more bass, which I find necessary on some tunes on my Ipod. Obviously you're not going to replicate a seperate sub by doing that, so it depends on what you're after. On a slightly different note, has anyone noticed that if you alter the fader either to the front OR the back, you seem to get a better sound than with it centered? I don't know what it is, but suspect that either the amplifier can send all it's grunt to 2 speakers instead of all 4, or that I have one or more speakers out of phase? Thoughts?