I bought another Goliath III cab and I'm so happy with the volume I now get. My amp, at the moment, consists of a SWR Bass 350 head and 2 Goliath III cabinets. It sounds so nice and loud and I finally have some headroom. I strongly suggest to anyone who is dissatisfied with their volume to get an extension or just another cabinet. I'm thinking about replacing the Bass 350 and getting the SM-500. I was playing one in the store and I liked how much you are able to change the sound with the 4 band eq and other knobs and buttons. Can someone explain to me how on some amps, there are only volume, bass, treble, and midrange controls? Is there a universally known frequency that those controls boost or cut or some random frequency? Again thanks for all help in advance. I'm really glad that there is a collective bass community who help and teach other, that I am a part of.