I'm not sure if this has been posted before as I tried searching the threads and didn't find anything. I just purchased an Ampeg SVT-4 Pro and when I tried running it mono bridged it had sever fizzle and crackling noises. Then after several different attempts at running it stereo with Speakon and 1/4" cables I concluded that when only Power Amp B was plugged in it was the one making all the fizzling and crackling noises. In anyone's experience would this be a Power Amp issue or could just the speaker jacks be the problem. If I run either speakon or 1/4" cables off of Power Amp B or Bridged it makes the noise. I'm trying to find out if it is still under warranty but looking to get more info just in case. Thanks in advance for any info!!!!!!