Hello every body. I am planning to buy a quality and price wise head, for a Hartke VX 410 (8ohms: 300watts (RMS), 400watts (peak) cabinet. I am thinking of buying GK amp, 400RBIV or MB500. What are the differences between them? Someone on this forum has mentioned that MB sounds "sterile" , not sure what that means. All I want is Flea's sound.