I have a cabinet with six 10 inch speakers and I am currently playing through a peavey XR-400. This is not an actual bass amp head. I guess it's just a PA head. So, how much of a better sound, if any, would I get if I got an actual bass amp head? What's the difference and if its a real big difference, whats the cheapest I can find that doesnt compromise quality? I saw one at a music store the other day and it was 1,000 bucks! is that the average price for a good one?