OK, I am having some serious brain cramps right now. All of this talk of cabs, amps, pre-amps, ohms, and watts is confusing me. To top it off, I have limited knowledge about this stuff in the first place. Here is the deal.... I have a 215 4ohm 400 watt cab right now. No one wants to buy it, so I am going to keep it. So, I want to add another cab to get a higher punch to my sound. Because the lowest rating on my HA3500 is 4ohm, I can not add another cab to this head. So, I came across a good deal for the Peavey Firebass. From what I can see, it is a single channel amp. The lowest rating is 700 watts at 2ohms. Sooooo, can I run a 410 or 210 cab with the 215? Are there any ohm restrictions I need to be aware of? Once again, thank you to those knowledgable ones out there who decide to help me out. If you ever make it to Seattle, a Starbucks on me.