I know it isn't the only factor, but how important is the fuse rating on amps? More specifically for class A/B amps. I know that class D amps are more efficient. But I see "2006 cea compliant" A/B amps that claim 600 RMS with only 40 amps of fusing and so on. I then see class D amps claiming 2000 RMS with only 140 amps and so on. I know "2006 cea compliant" doesn't mean much to the real car audio enthusiast, but it pisses me off when I see "2006 cea compliant" Kenwood amps claiming way more RMS watts then their fuse rating suggests. What are some good signs as to telling what the real RMS of amps are?