I've just replaced my old MB150S with new MB150E (series III). While I like the sound, I was unpleasantly surprised by the noise level of this new combo. I'm talking about the hiss one can hear from the speaker after the amp is switched on. It's not a big deal at all in this case, it's just that the old combo was VERY silent, so I was a little surprised the new one is little noisier. Now I'm not sure if this is normal, or something is wrong with my combo. Is there anybody who has compared the older and the new GK MB combos in this matter? Thanks!