I just ordered a brand new SVT-15E from basscentral.com, and played it for the first time with my 410-HE out of my 450H head. For Reference: The 15 is an 8ohm cab rated at 200W RMS and 400W program. The 410 is also 8ohm, rated at 500W RMS and 1000W program. The head gets 250W at 8ohms and 450W at 4ohms, which it is now doing with both cabs hooked up to it (there is a very noticable volume increase even at 1 or 2 on the master volume). As sweet as this sounds and looks, there are a few tiny things that have my concerned with the matchup of these two cabinets. I started out plugging the head into the 410 and then plugging the 15 into the 410. This was causing some slight crackling in the 15 at higher gains, so I switched the order, which seemed to elliminate the problem. Running the amp out into the 15 first and then from the 15 to the 410 however made the 410 sound kind of quiet compared to the 15. When I put my head up to the cabs and played the 15 definitely sounded louder. Plugging each cab seperately into the amp worked fine, however there was some slight crackling in the 410 at first (it seemed to go away after a little while) after I had played the two of them together. That cab has played beautifully for 2 years with zero problems, and I would kill myself if anything happened to it. Switching speaker cables also seemed to have an effect on the crackling. It did it less with my older cable than with the one I just bought. Questions: What exactly is this crackling sound and why is it happening? Am I hurting my cabs with differing amount of power or hooking them up in the wrong order? Does it matter which output/input jack you use to chain the cabs together? I've never read anything online or in the Ampeg owner's manuals about that being important. I admit I am suspicious of the 15's 200W rating since my amp is dishing out 450...is this a problem for the 15 to have that much power going into it even though it's paired with a 410 rated at 500W? I would appreciate some help!