I am a midlife newbie and have just graduated from a 90 watt combo to a Hartke 3500 and 4x10xl cab. Bought these separately over a 6 day period for a total of $325. Being a computer guy, I find most manuals to be fairly bad and the hartke manual is right in the fray. On the back of the amp are 2 speaker jacks and they have 8 ohm written next to them. In the manual it states to plug a 4,8 or 16 ohm cab into that jack. I am planning to have another 8 ohm cab. (possibly and avatar 112) The 4x10 has 2 jacks and i understand that I can go from amp to the 4x10 and then from there to the other cab. This will give me 4 ohms. The question is what happens if I plug each cab into one of the external jacks. Does this still also give 4 ohms on the 3500?