Alright, last night our band, along with some other local bands, was putting on a benefit concert for a friend of ours who was killed in a car accident in December. We were in our schools almost new, it is enormous (seats like 1000) and we had a pretty large crowd, 300 something I'd say. Anyway... I was playing in the sound check and during the show and had a couple problems. I was clipping the whole time, I currently have a Peavey TKO 115 combo amp, about a year or so old. It couldn't begin to compete with my friends guitar amp (has tubes...cool... ) the drummer, and the keyboard player through the PA. I couldn't get enough volume, I brought down the lower frequencies to reduce the clipping and turned up the high to get a better bass sound in the auditorium. I have used this amp many times with the school jazz band in the same auditorium and it was fine but the trombones and trumpets aren't playing through amps, most of the time I could overpower the band. I need more power! Our band has started to become much more serious and better, I feel upgrading to a better amp may be a good idea. I am currently thinking of getting a head and a cabinet. I do not know how many watts I want, or what size cabinet, though I am leaning towards a 4x10 instead of like a 1x15 or 2x10. I figure it will give me the extra boost! I have looked at heads online and tend to like the Ampegs and SWRs. Should I get a tube or tubeless head? Does it matter that much with a bass? What heads do you recommend? What cabinets? Is it bad to have an ampeg head with a SWR cabinet? Cabinets are rated at a certain "wattage" if I put 400 watts through a 300 watt cabinet...well is that even possible? I want to do this right the first time and do not have to keep buying new equipment. I know that this decision will also be based on what I think sounds better but what do you guys recommend? What will be good for jazz and classic rock? BTW- I play Fender MIM Jazz with nylons/flatwounds if that matters at all....i dont tihnk it does. The concert was great we raised almost 5000 dollars. Thanks for all your guys help.