For some reason, when it comes to amplification (and to a lesser extent, drums), I feel that it doesn't matter what I buy from that brand, as long as I can afford it. For example, would a Gallien-Krueger 2001RB sound similar to a Gallien-Krueger Backline 600, right? The main difference is price, right? Also, I'm under the impression that the only difference in tone between, say, a 1x12 cabinet and a 6x10 cabinet is volume. Would I be correct?