I have an LH500 amp and two 2x12's. My rig of choice. Lately I've had GAS thinking about adding a Hartke HD115 for more low end. So, If I buy a Hartke LH1000 (because it has two separate 500 watt amps), I could drive the 2x12's on one side and the 15" on the other. However the LH1000 output is 4 ohms. The 15" is 8 ohms and not switchable. I could run just one 12" set for 8 oms + the 15" and get full wattage from the LH500. Then I wouldn't need the LH1000. But.. I want to use all that I have. No .. I don't want to use two amps. What to do?