I've been playing a combo amp the entire time I've been playing bass (3 years) so I don't know squat about bigger rigs. I got a used 215 cab from a TB'er awhile back. He had told me that he used a Hartke 3500 and that he found it necessary to use a 'Gramma' pad between them to protect the head from vibration. The head that I am now dealing on is an SWR Workingman's 4004 which "comes in it's own carpeted rack". Will that work better sitting on top of the cab than the Hartke 3500 did (not in a rack)? Or will I still be likely to need padding in between? The cab should take the full 400 watts at 4 ohms. Do I just set the head on top of the cab and hook it up with an instrument cable and try to learn not to clip it, or should I have an insulating pad in between? Is there more that I need to know about to use this type of rig?