Ok so I went to guitar center again and this time, I hooked up the 1x15 to the 500c and I wasn't able to reproduce the crackling sound. Maybe because I didn't need the gain or master up as loud with the two together. Had the gain at 9 o'clock as suggested here, master around 11 o'clock and I backed the bass down to 10 o'clock.
The pair sounded so killer together that when I unplugged the 1x15 and played the 500c by itself and then went to the 200c and played it by itself, it just wasn't the same. That full 500 watts and the combo of the 10s and 15 spoiled me, so I bought the 1x15! $199, couldn't pass that up. Have to wait 3 weeks to pick it up but I can't wait.
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