There're two speaker jakcs paralled and text: 4 ohm minimum load. And manual says: "Two paralled 1/4" speaker jacks are provided for connection to speakers enclosures. The minimum speaker load impedance is 4 ohms." So, is it right that if I want to connect two cabins to head, they must be 8 ohm/cabin. Or can I put two 4 ohm cabins? I'm not sure, so please tell me the truth. My head is Pevey Sessionbass.