Need more bass response

I'm in dire need of more bass to balance out the sound in my system. Granted it's not high, high end but safe to say I have a fair amount invested. It is a Belles 150 HotRod amp linked to a Rogue Magnum 99 pre. Source is a Rega Jupiter ( newest model) and speakers are PSB silvers. The Rogue has a 3 position gain knob which leaves me wanting for another notch higher.
I'm asking if I were to add or change any component, what would the peanut gallery suggest? The cables are not equal to the quality of my system (read: I'm not sold on the difference between cables) yet they are not crap.
Go ahead- I'll take my licks.
Thanks in advance.