Been using a passive Fender Jazz 4 into a Aphex Bass Exciter into a "1984" model G.K. 800 head, (300 watts at 4 ohms), into a 4 ohm Avatar 115H cab. Cabinet is rated at 600watts. I've got the opportunity to buy a G.K. 1001 RB II head, (700 watts at 4 ohms), at a more than a resonable price. My question is...using the same 4 ohm Avatar 115H cab what differences will I notice? Will there be changes in my tone by going to more than double the wattage I was using?